WO2018146750A1

WO2018146750A1 - Satellite relay device

Info

Publication number: WO2018146750A1
Application number: PCT/JP2017/004604
Authority: WO
Inventors: 俊之久世; 佐々木　剛; 和英樋口; 二葉江島; 輝巳須永
Original assignee: 三菱電機株式会社
Priority date: 2017-02-08
Filing date: 2017-02-08
Publication date: 2018-08-16
Also published as: JPWO2018146750A1; JP6656432B2

Abstract

Implemented is a flexible satellite relay device which is configured such that, when the frequency band of an input multibeam exceeds the input frequency band of a digital channelizer, in an input-side flexible switch matrix, the multibeam is converted into beams within the input frequency band of the digital channelizer by a command from ground equipment, and the beams are inputted to the digital channelizer, and in an output-side flexible switch matrix, signals exchanged by the digital channelizer are synthesized to a continuous band, and input ports and output ports for the digital channelizer can be shared among all the beams.

Description

Satellite relay device

The present invention relates to a satellite repeater, and more particularly to a satellite repeater used in a satellite communication system.

Conventionally, in order to realize frequency utilization of satellite communication, increase in capacity of satellite system, etc., in a relay satellite that relays data from a plurality of uplink beams to a plurality of downlink beams, a relay having a digital channelizer mounted on a satellite relay device A satellite has been proposed. A technology related to such a satellite relay device equipped with a digital channelizer is disclosed, for example, in Patent Document 1 below.

A relay satellite equipped with a digital channelizer has a function of dividing an input beam into a plurality of subchannels, mapping the output beams on a subchannel basis, combining them, and outputting the result. However, since beam input and beam output beyond the input / output band planned in advance can not be performed, there has been a problem that if service traffic during the operation period changes significantly, it can not cope with input / output of these beams.

In addition, if a satellite repeater supporting multiple beams (hereinafter referred to as a multibeam satellite repeater) is configured using the maximum traffic of beams predicted during the operation period, a large-scale digital channelizer having many input / output ports There was a problem of requiring

International Publication WO2014 / 125600

In the multi-beam satellite relay apparatus, in order to cope with service traffic that fluctuates during the operation period shown in the above problem, the input and output beams exceeding the traffic planned in advance are accommodated in the satellite relay apparatus, whereby the input / output port Even with a small number of digital channelizers, it is possible to construct a satellite repeater capable of coping with traffic variations without reducing the number of beams accommodated.

To explain this specifically, in the satellite communication system using the conventional digital channelizer, the input / output band is determined by the maximum traffic planned in advance, and the input / output band for each beam is set below the digital channelizer input / output band. Implement the splitting of the input beam and the combining of the output beam.

For example, when a satellite relay apparatus is constructed using a digital channelizer having 80 MHz input / output ports of 500 MHz, when trying to accommodate 10 GW (gateway) stations with a maximum traffic of 3 GHz, the digital channelizer input / output port band In order to divide the input beam band 3 GHz into six according to 500 MHz, the GW10 station occupies the input port 60 port of the digital channelizer, and even if there is a 60 beam user service area, the number of beams that can be accommodated is limited to 20 beams Be done.

As described above, if the I / O port of the digital channelizer is occupied with the maximum traffic, the number of satellites can be reduced, so temporary traffic fluctuation (maximum traffic utilization) can be reduced by using other beams. There is a need for a satellite relay system that can input beam bands higher than previously planned traffic without reducing the number of input beams by adapting the input and output ports of the digital channelizer used.

The present invention has been made to solve the above problems, and enables beam band input / output beyond the digital channelizer input band, shares the digital channelizer input / output port with all beams, and has a fixed period of time In order to cope with the increase in traffic, the satellite repeaters can input traffic exceeding the digital channelizer's input / output bandwidth without reducing the number of beams that can be accommodated by exchanging the input / output bandwidth between beams. It aims to be realized.

In order to achieve the above object, a satellite repeater according to the present invention comprises an input-side flexible switch matrix for dividing an input beam into a plurality of frequency bands and converting the frequency to a digital channelizer input frequency, and the digital channelizer. An output-side flexible switch matrix is provided which combines the plurality of output signals exchanged into a continuous band.

According to the present invention, even if the frequency band of the input and output beams exceeds the previously planned input and output bands, it is possible to divide the input beam and synthesize the output beam using commands from the ground equipment. Satellite repeaters capable of coping with increased traffic, and even when using a digital channelizer with a small number of input / output ports, it is possible to perform large-capacity communication without reducing the number of beams accommodated. .

FIG. 1 is a block diagram showing a configuration of a satellite relay device according to Embodiment 1; FIG. 2 is a diagram showing a signal flow path when an input / output band is divided / combined in a flexible switch matrix constituting a satellite relay device in FIG. FIG. 16 is a block diagram conceptually showing an example of beam accommodation based on average traffic on the input side of the second embodiment. FIG. 13 is a block diagram conceptually showing an example of beam accommodation based on the maximum traffic on the input side of the satellite relay apparatus according to Embodiment 2. FIG. 16 is a block diagram conceptually showing an example of beam accommodation based on average traffic on the output side of the satellite relay apparatus according to Embodiment 2. FIG. 16 is a block diagram conceptually showing an example of beam accommodation based on 3 GHz traffic on the output side of the satellite relay apparatus according to Embodiment 2. FIG. 16 is a block diagram showing a configuration of an RF channelizer that can be used instead of the combination of the tunable down converter and the BPF in the satellite relay apparatus in FIG. 1 of the third embodiment. FIG. 20 is a block diagram showing a satellite communication system including the satellite relay device according to Embodiment 4 and a ground device communicatively connected to the satellite relay device. FIG. 16 is a flowchart showing a control flow of the satellite relay device in the fourth embodiment. It is a figure which shows the control sequence of the satellite communication system in FIG. It is a sequence diagram for UL use band information acquisition in ground equipment. It is the sequence diagram concretely shown regarding UL band addition. It is the sequence diagram concretely shown regarding UL band deletion. It is a sequence diagram for DL use band information acquisition in a ground apparatus. It is the sequence diagram concretely shown regarding DL band addition. It is the sequence diagram concretely shown regarding DL band deletion. It is a block diagram for demonstrating notionally the traffic control in uplink (UL) of the ground apparatus communication-connected by the satellite payload provided with the satellite relay apparatus which concerns on Embodiment 5 of this invention. It is a conceptual diagram which shows the threshold value in the traffic control of FIG. FIG. 18 is a sequence diagram showing an algorithm of band addition / deletion in the traffic control of FIG. 17;

Hereinafter, various embodiments of the satellite relay device according to the present invention will be described in detail with reference to the attached drawings.

Embodiment 1
First, an apparatus configuration of a satellite relay apparatus according to a first embodiment of the present invention will be described with reference to FIG.
In FIG. 1, the satellite relay apparatus according to the first embodiment includes a flexible switch matrix (Flexible SW Matrix) 9, a digital channelizer (Digital CHZ) 10, and a flexible switch matrix 11. Ru. The satellite relay apparatus according to the first embodiment is mounted on a relay satellite as a satellite payload that constitutes a flexible payload.

The input-side flexible switch matrix 9 according to the present invention includes a switch matrix unit SWM1 configured of hybrid units (HYB: Hybrid) 16 to 19 and selectors (SELECTOR) 20 to 23, and a tuner that performs frequency conversion to an arbitrary frequency. A digital channelizer 10 comprising a Bull down converter (Tunable DCON) 24 to 27 and a Band Pass Filter (BPF) 28 to 31 for mapping a subchannel of an arbitrary input beam to a subchannel of an arbitrary output beam. Put on the input side.

The output-side flexible switch matrix 11 of the present invention includes tunable upconverters (Tunable UPCON) 48 to 51, frequency pass filters 52 to 55, and a selector for frequency-converting the digital channelizer output signal to an arbitrary band of the output beam. A switch matrix unit SWM2 is formed of 56 to 59 and hybrid units 60 to 63, and is placed on the output side of the digital channelizer 10.

The band pass filters 28 to 31 of the flexible switch matrix 9 on the input side are included in the flexible switch matrix 9 when the band restriction and the spectrum suppression are required. Similarly, the band pass filters 52 to 55 of the output side flexible switch matrix 11 are included in the flexible switch matrix 11 when band constraint and spectrum suppression are required.

Thereby, after switching arbitrary input beams 12 to 15-Beam # 1 to # 4 by the switch matrix unit SWM 1 in the flexible switch matrix 9, frequency conversion is performed by the tunable down converter (Tunable DCON) 24 to 27. (Down-convert) and pass through band pass filters 28 to 31 from output ports 32 to 35 of the flexible switch matrix 9 to arbitrary input ports 36 to 39 (input ports # 1 to # 4) of the digital channelizer 10. Make it possible to connect.

Next, in the flexible switch matrix 11, the output signals from any of the output ports 40 to 43 (Output Ports # 1 to # 4) of the digital channelizer 10 are received at the input ports 44 to 47, and tunable up is performed. The frequency is converted (up converted) by the converter (Tunable UPCON), switched through the band pass filters 52 to 55, and switched by the switch / matrix unit SWM2, and then output as arbitrary output beams 64 to 67-Beam # 1 to # 4. .

The switch / matrix unit SWM1 is composed of hybrid units (HYB) 16 to 19 which are distributors and selectors (SELECTOR) 20 to 23. The switch / matrix unit SWM2 is configured of selectors (SELECTOR) 56 to 59 and hybrid units (HYB) 60 to 63. These switch / matrix units SWM1 and SWM2 can also be configured by a hybrid unit and a passive switch such as C-SW or T-SW.

Next, control of the flexible switch matrix 11 of the satellite relay apparatus according to the first embodiment shown in FIG. 1 will be described with reference to FIG.

The command control unit A13 of the input-side flexible switch matrix 9 designates a path from the hybrid unit through the control lines A50 to A53. The selectors 20 to 22 in FIG. 2 respectively select paths from the hybrid unit 16 in order to divide the input signal band of Beam # 1_12 into three, and the selector 23 inputs the signal from Beam # 4_A77 without dividing it. Therefore, the path from the hybrid unit 19 is selected.

Next, the command control unit A13 of the flexible switch matrix (input side) 9 converts it by the control line A54 in order to divide the input frequency band of the beam 69-Beam # 1 Bandwidth into three frequency bands 70 to 72. The frequency "FcforBW # 1 (A90) -IF" is set, the conversion frequency "FcforBW # 2 (A91) -IF" is set at the control line A55, and the conversion frequency "FcforBW # 3 (A92)" is set at the control line A56. Set “-IF”.

On the other hand, the command control unit A 15 of the flexible switch matrix (output side) 11 up-converts an output signal of IF (Intermediate Frequency) frequency into an output RF (Radio Frequency) signal and combines three bands into one band. The conversion frequency "FcforBW # 1 (A95) -IF" is set in the control line A58, the conversion frequency "FcforBW # 2 (A96) -IF" is set in the control line A59, and the control line A60. Set the conversion frequency “FcforBW # 3 (A97) -IF”.

Next, the command control unit A 15 of the flexible switch matrix (output side) 11 performs switch setting of the selectors 56 to 59 through the control lines A 62 to A 65. In control lines A62 to 64, paths to the hybrid unit 60 are set in selectors 56 to 58 respectively to form a path A94, and in the hybrid unit 60, an input IF band -73, an input IF band -74, and an input IF band Output beam 80-Beam # 1 Bandwidth of the continuous band which respectively becomes band BW # 1-77, band BW # 2-78, and band BW # 3-79 respectively corresponding to -75.

As a result, the RF signal input by beam 69-Beam # 1 Bandwidth is divided into three bands, input to the input ports 36 to 38 of the digital channelizer 10 at the IF frequency, and the output port 40 to the digital channelizer 10 The signals output from 42 are combined by the hybrid unit 60 through selectors 56 to 58, and output as a beam 80-Beam # 1 Bandwidth, which is an RF signal of the beam 64-Beam # 1.

As described above, by using the satellite relay apparatus provided with the flexible switch matrix according to the first embodiment, it is possible to input traffic (band) exceeding the input band of the digital channelizer, and the output of the digital channelizer It enables output of traffic (band) exceeding the band.

Next, the operation of the flexible switch matrix of the satellite relay apparatus of the first embodiment shown in FIG. 1 will be described using FIG.

First, in the flexible switch matrix 9 on the input side of the digital channelizer 10, for example, as indicated by a dotted arrow, the wide band signal 69 input from the beam 12-Beam # 1 is all selectors Distribute to 20-23.

Then, the signals of the beams 12-Beam # 1 respectively selected by the selectors 20-22 designated by the control lines A50-A52 are sent to the tunable down converters 24-26. Here, the center frequencies of the signal 70 of the band BW # 1, the signal 71 of the band BW # 2, and the signal 72 of the band BW # 3 obtained by dividing the band of Beam # 1 (beam 69-Beam # 1 Bandwidth) into three respectively. Are respectively down-converted to different frequency bands so that they become IF frequencies that are input frequencies of the digital channelizer 10, and the digital channelizer 10 filters the signals that have been band-pass filters 28-30 into bands 70-72. Enter in

Specifically, for example, when a 750 MHz band beam with a center frequency of 20 GHz is input to Beam # 1-12 and this is input to a digital channelizer 10 that enables an input of a 250 MHz band beam at an IF frequency of 1 GHz. explain.

The 750 MHz band signal input to beam # 1-12 is divided into three by the switch / matrix unit SWM1, and input to the tunable down converters 24 to 26, respectively.
The tunable downconverter 24 frequency-converts an input beam with a center frequency of 20 GHz into a 750 MHz beam (conversion frequency 19.25 GHz), and the tunable down-converter 25 frequency converts an input beam with a center frequency of 20 GHz into a 1000 MHz beam (conversion The tunable converter 26 frequency-converts an input beam with a center frequency of 20 GHz into a 1250 MHz beam (conversion frequency of 18.75 GHz).

Next, band-pass filters 28 to 30 having a center frequency of 1 GHz are used to filter in the 250 MHz band, respectively, and bands BW # 1 to BW # 3 of the 1 GHz center frequency are extracted from output ports 32 to 34, Input to the channelizer input port InputPort # 1-36 to InputPort # 3-38 in the 250 MHz band.
Thus, for example, it is possible to divide the beam band three times the digital channelizer 10 into three and input it to the digital channelizer 10.

As described above, by using the flexible switch matrix 9, the input band signal which is variable according to the user traffic can be input channel band of the digital channelizer 10 at the maximum by the number of input ports no matter which beam is input. There is an effect that the beam band that can be accommodated can be extended to the calculated beam band.

Next, in the flexible switch matrix 11 which is the output side of the digital channelizer 10, the bandwidth BW # 1 to BW # of the IF frequency from the output ports 40 to 42 (Output Ports # 1 to # 3) of the digital channelizer 10 Three signals 73 to 75 are output. The signals 73 to 75 of the bands BW # 1 to BW # 3 of these IF frequencies are converted differently so as to be the signals 77 to 79 of the bands BW # 1, # 2, and # 3 of the output beam 64-Beam # 1, respectively. The frequency is upconverted in a tunable upconverter (Tunable UPCON) 48-50 and filtered using a band pass filter 52-54. The filtered beams 77 to 79 are combined by the hybrid unit 60 via selectors 56 to 58 to generate a beam 80-Beam # 1 of a continuous output frequency band.

Specifically, the 1 GHz center frequency of the 250 MHz band signal 73 output from Output Port # 1-40 of the digital channelizer 10 is frequency converted to 9.75 GHz (conversion frequency 8.75 GHz) by the tunable up converter 48, and the Output Port The 1 GHz center frequency of the 250 MHz band signal 74 output from # 2-41 is frequency converted to 10 GHz (conversion frequency 9 GHz) by the tunable up

converter

49, and 1 GHz of the 250 MHz band signal 75 output from OutputPort # 3-42 The center frequency is frequency converted to 10.25 GHz (conversion frequency 9.25 GHz) by the tunable up converter 50. Then, these frequency converted signals are subjected to spurious suppression by the band pass filters 52 to 54 as necessary, and these signals are synthesized by the hybrid unit 60 via the switch / matrix unit SWM 2 to obtain a 10 GHz center frequency. Output a beam 80-Beam # 1 Bandwidth of 750 MHz.

As described above, in the first embodiment, by combining the signals output from the digital channelizer 10 having a fixed frequency band, an advantage is obtained that a wide band signal according to user traffic can be output from any beam. There is.
Also, the band of the output beams 64 to 67-Beam # 1 to # 4 has an effect of enabling output of variable band signals up to the output port band of the digital channelizer 10 × the number of output ports.

In addition, a PF (pre-select filter) and an LNA (Low Noise AMP) are provided at the front stage of the satellite relay apparatus according to the first embodiment. If NF is degraded due to increased loss due to distribution in the hybrid part of the flexible switch matrix, gain may be provided in the tunable down converter.

Second Embodiment
A satellite relay apparatus constituting a flexible payload according to a second embodiment of the present invention is a satellite relay apparatus having the maximum traffic (band) of an input beam in the satellite relay apparatus provided with the flexible switch matrix of the first embodiment. For example, if the satellite repeater is configured with the average traffic of the input beam and the maximum traffic is required with any beam, the I / O port of the digital channelizer shared by all beams is used instead of By matching, even if a digital channelizer with a small number of input / output ports is used, the number of beams that can be accommodated can be increased.

For example, in a satellite repeater using a flexible switch matrix having 70 input ports × 80 output ports and a digital channelizer having 500 MHz band × 80 input ports, the flexible switch matrix and the digital channelizer port are shared. When allocated with maximum traffic without using 10 GW (Gateway) stations requiring traffic transmission of up to 3 GHz, 60 ports of the digital channelizer's input port will be used only by GW stations, and users other than GW The number of ports allocated to the beam will be 20.

Do not secure the beam bandwidth with the maximum traffic, secure the beam bandwidth with the average traffic, and when the maximum traffic is needed, the input / output port of the digital channelizer without real traffic or the priority If the average traffic of the GW is 1 GHz, the number of ports used by 10 GW stations is limited to 20 ports by using the I / O port of the digital channelizer used by the lower beam to accommodate the maximum traffic. In addition, 60 ports can be allocated to user beams other than the GW.

The beam accommodation method on the input side of the second embodiment will be described with reference to FIGS. 3 and 4.
In the satellite relay device configured by the illustrated flexible switch matrix 80 and the digital channelizer 81, the flexible switch matrix on the output side is omitted for simplification of the description. Each of these flexible switch matrices is similar in configuration to that of the first embodiment.

In FIG. 3, a flexible switch matrix 80 on the input side accommodates, for example, 10 GW stations of 1 GHz in average traffic and 60 user beams of 500 MHz band in a flexible switch matrix 80 on the input side using an input / output 80 port digital channelizer 81 of 500 MHz band Shows the configuration of the flexible switch matrix.
The flexible switch matrix 80 has Input Ports # 1 to # 70 at input ports and Output Ports # 1 to # 80 at output ports. The output ports # 1 to # 80 are connected to the input port Input ports # 1 to # 80 of the digital channelizer 81.

For example, the 1 GHz band of the GW BEAM # 1-82 GW is input to the input port # 1-86 of the flexible switch matrix 80. The GW BEAM # 1_82 input to the input port # 1-86 of the flexible switch matrix 80 is divided into two bands of 500 MHz by the flexible switch matrix 80, and the output port # 1-90 and the output port # 2 After being outputted from -91, they are inputted to the input port # 1-96 and the input port # 2-97 of the digital channelizer 81.

Therefore, if bandwidth division is performed at 3 GHz of the GW maximum traffic, 20 ports (= 2 ×) are required for the GW 10 stations where 60 ports (= 6 × 10) of the input port of the digital channelizer 81 are required for 10 GWs. 10) and the remaining 60 ports (= 80 ports-20 ports) can be assigned to user beams, allowing accommodation of all beams including the GW signal.

Next, in the second embodiment, when it is necessary to transmit maximum traffic of 3 GHz by the GW beam for a fixed period, the output port of the flexible switch matrix 80 on the input side is logically connected to the input port. By using the flexible switch matrix 80 and dividing the input band from the GW by using the free port which can not be used or the output port which can be suspended for a fixed period, and inputting it to the digital channelizer 81, Enables accommodation of 3 GHz band beams from

Here, a method of accommodating 3 GHz GW traffic will be described using the example of FIG.
For example, GW beam # 1_82 of 3 GHz is frequency-divided (500 MHz × 6) in flexible switch matrix 80, and output from digital channelizer 81 through

output ports

90, 91, 104 to 107 of flexible switch matrix 80. The data is input to input

ports

96, 97, 111-114.

At this time, the beams utilizing the output ports 104 to 107 of the flexible switch matrix 80 and the input ports 111 to 114 of the digital channelizer 81 can not connect the input from the beam to the channelizer 81.
However, the output port of the flexible switch matrix 80 need not be a physically continuous port, but may be any port of the flexible switch matrix 80.

Therefore, when there are free ports, GW ports that have not been used for a certain period of time, or user ports that do not have traffic, use these output ports to transmit the divided GW band to the digital channelizer 81. it can.

As described above, in the second embodiment, when any beam requires a bandwidth equal to or higher than the average traffic, a flexible switch matrix of beams which can not be used by other beams or can be interrupted. By using the output port of, it is possible to input to the digital channelizer of the bandwidth above the average traffic.

Thereby, the input port of the digital channelizer 81 is allocated based on 1 GHz of GW average traffic, compared to the case of GW10 station + 20 user beam accommodation when the input port of the digital channelizer 81 is allocated based on 3 GHz of GW maximum traffic, When the GW needs traffic of up to 3 GHz, the GW10 station + 60 user beams can be accommodated by adopting a method of interchanging the input port of the digital channelizer with all beams.

As described above, in the second embodiment, the input port of the digital channelizer is shared by using the flexible switch matrix as compared with the satellite repeater using the input port of the digital channelizer at maximum traffic. The number of input beams can be increased.

From this, it is possible to increase the number of input beams that can be accommodated without increasing the number of input ports of the digital channelizer, and it is possible to adopt an inexpensive satellite repeater configuration.

Next, the output side beam accommodation method according to the second embodiment will be described with reference to FIGS. 5 and 6. In the satellite relay device configured by the illustrated digital channelizer 81 and the flexible switch matrix 200, the flexible switch matrix 200 on the output side is omitted for simplification of the description. The configuration of these flexible switch matrices 200 is similar to that of the flexible switch matrix 11 of the first embodiment.

As shown in FIG. 5, the GW output beam combines 500 MHz band signals output from the two output ports of the digital channelizer 81 by the flexible switch matrix 200 on the output side, and outputs it with a 1 GHz beam. Output ports Output port # 1 to # 80 (-203 to 208) of the digital channelizer 81 are connected to input ports # 1 to # 80 (-209 to 214) of the flexible switch matrix 200.

Output ports # 1 to # 20 (-203 to 206) corresponding to 201 GWports (20 ports) in the digital channelizer 81 are subjected to frequency conversion (up conversion) by the flexible switch matrix 200 and then synthesized into a 1 GHz band. And output ports Output from ports # 1 to # 10 (-215 to 216) as GW beams of 10 stations.
Also, Output Ports # 21 to # 80 (-207 to 208) corresponding to 202 Userports (60 ports) in the digital channelizer 81 are frequency converted (up converted) by the flexible switch matrix 200, and then output ports Output It is output as a 500 MHz user beam from Port # 11 to # 70 (-217 to 218).

Next, when an output of 3 GHz band is temporarily required in the GW beam, as shown in FIG. 6, for example, the output port Output Port # 1 to # 1 of the digital channelizer 81 corresponding to 201 GWports (20 ports) Outputs from Output Ports # 21 to # 24 (-207 to 236) corresponding to parts of 20 (-203, 219, 230 to 233, 220, 206) and 202 Userports (60 ports) are the flexible switch matrix 200. Port # 1 to # 24 (-209 to 240, 222, 212, and 213 to 243). These received signals are frequency converted (up converted) to a continuous band by the flexible switch matrix 200, and then combined into a 1 GHz band, and output ports Output Port # 1 to # 10 (-215 to 216) ) Are output as GW beams of 10 GHz stations respectively.
Also, the remaining Output Ports # 25 to # 80 (-237 to 208) at 202 Userports (60 ports) of the digital channelizer 81 are frequency converted (up converted) by the flexible switch matrix 200, and then the output port Output It is output as a 500 MHz user beam from any of the ports # 11 to # 70 (-217 to 218).

As described above, according to the third embodiment, it is possible to use the output port of the flexible switch matrix 200 corresponding to a beam which is not used by other beams or which can be interrupted. Enables output to a digital channelizer in a band higher than traffic. Also, at this time, the output port of the digital channelizer 81 does not have to be a physically continuous port, but may be any output port.

Thereby, the output port of the digital channelizer 81 is allocated based on 1 GHz of GW average traffic, compared with the case of GW10 station + 20 user beam accommodation when the output port of the digital channelizer 81 is allocated based on 3 GHz of GW maximum traffic, When the GW needs up to 3 GHz average traffic, it is possible to accommodate the GW10 station + 60 user beams by adopting the method of interchanging the output port of the digital channelizer with all the output beams.

As described above, in the second embodiment, the flexible switch matrix is used to share the digital channelizer output port as compared with the satellite repeater using the digital channelizer output port for maximum traffic. The number of output beams can be increased.

From this, the number of output beams that can be accommodated can be increased without increasing the number of output ports of the digital channelizer, and it is possible to adopt an inexpensive satellite repeater configuration.

Third Embodiment
In the satellite relay device provided with the flexible switch matrix according to the above-described first and second embodiments, the Jamming-resistant flexible is achieved by replacing the downconverter performing frequency conversion of the flexible switch matrix on the input side with the RF channelizer. Switches and switch matrix configurations are possible.

The configuration of the RF channelizer is shown in FIG. The RF channelizer A100 shown in FIG. 7 is provided with a high pass filter HPF_A104 and a low pass filter LPF_A105 in the IF frequency band, and the frequency conversion sections A101 to A103 convert the frequency arbitrarily, thereby bandpassizing the high pass filter HPF_A104 and the low pass filter LPF_A105. Use as. The frequency conversion units A101 to A103 can be converted to an arbitrary frequency (tunable), so that the rejection frequency of the band pass filter can be made variable.

Therefore, for example, the input beam A 111-in FIG. 7 can be obtained by replacing the tunable down converters 24 to 27 and the band pass filters 28 to 31 of the input side flexible switch matrix in the first embodiment and the second embodiment with an RF channelizer. In the state where the jamming wave A110 is input to Beam # 1, after suppressing the low frequency side with the high pass filter HPF_A104 of the RF channelizer, when suppressing the high frequency side with the low pass filter LPF_A105, the conversion frequency of the frequency conversion unit A102 is The operation enables suppression of the jamming wave A110.

As described above, by providing the RF channelizer in the flexible switch matrix of the first embodiment and the second embodiment, it is possible to suppress the jamming wave.
The RF channelizer is also applicable to the flexible switch matrix (output side) 11.

Fourth Embodiment
Next, the control method of the satellite relay device according to the first to third embodiments will be described.

[Control unit configuration]
FIG. 8 is a diagram showing the configuration of a satellite communication system according to a fourth embodiment of the present invention.
In the figure, the satellite communication system according to the fourth embodiment includes a satellite relay device A5 equipped with a flexible switch matrix, a line control device A1 of a ground device A0 controlling the same, a ground satellite GWA2, and a ground mission control device It consists of A3 and NOC (Network Operating Center) A4.

The ground device A0 includes a line control device A1, NOCA4, and a ground mission control device A3. The line control device A1 includes a traffic control unit A6 that determines and requests bandwidth variation for each beam. The NOC_A 4 has a traffic monitoring unit A 7 that monitors the traffic for each beam, and a command generation unit A 8 that generates a command for changing the configuration of the

flexible switch matrices

9 and 11 to the satellite relay device A 5.

The satellite relay device A5 receives a command from the command receiving antenna A10, and generates a command signal instructing the units 9 to 11 to perform the setting according to the command, and receives from the RF signal receiving antenna A11 Digital channelizer 10 for mapping and transmitting a signal to an arbitrary frequency of a desired beam, and flexible switch matrix (input side for dividing traffic to accommodate traffic exceeding the input band of digital channelizer 10 9) and a flexible switch matrix (output side) 11 for combining traffic.

The flexible switch matrix (input side) 9 of the satellite relay device A5 is a hybrid of a command control unit A13 that changes the configuration of the flexible switch matrix according to an instruction signal from the command control device A12, a switch matrix unit SWM1, and a hybrid (HYB) 16 to 19, selectors (SELECTOR) 20 to 23, tunable down converters (Tunable DCON) 24 to 27 for converting arbitrary input RF signals to IF frequencies, and BPFs (band pass filters) 28 to And 31.

The digital channelizer 10 divides the input RF signal into sub-carriers by setting the configuration of the digital channelizer 10 according to an instruction signal from the command control device A12, and divides the input RF signal into sub-carriers. A switch unit A17 that switches subcarriers and a multiplexer unit A18 that multiplexes the divided subcarriers from the switch unit A17.

The digital channelizer 10 cuts out an arbitrary RF signal in the input beam at the demultiplexing unit A16, the switch unit A17, and the multiplexing unit A18, and maps, ie, exchanges, in an arbitrary frequency band in the output beam.

The flexible switch matrix (output side) 11 up-converts the IF frequency to an arbitrary RF frequency according to an instruction signal from the command control device A12 and changes the configuration of the flexible switch matrix. The tunable up-converter (Tunable UPCON) 48 to 51, the BPF (band pass filter) 52 to 55, and the selectors (SELECTOR) 56 to 59 forming the switch matrix unit SWM2 and the hybrid unit (HYB) 60 to 63 Configured

The command control unit A12 of the satellite relay device A5 instructs the command control unit A13 of the flexible switch matrix (input side) 9 to change the configuration for dividing the input beam, and the hybrid units 16 to 19 and the selector 20 The selector of the switch matrix unit SWM1 consisting of to 27 is set. Next, the command control device A12 branches the input signal into a plurality of paths by setting the conversion frequency of the tunable down converters 24 to 27, and performs frequency conversion by the tunable down converters 24 to 27, and the band pass filter 28 The channelizer input frequency band is extracted using ̃31.

On the other hand, the command control device A12 of the satellite relay device A5 outputs a signal of configuration change instruction for combining output signals to the command control unit A15 of the flexible switch matrix (output side) 11, thereby enabling a tunable up-converter The conversion frequency setting of 48 to 51, and the setting of the switch matrix unit SWM2 including the selectors 56 to 59 and the hybrids 60 to 63 are performed. Then, the signal output from the digital channelizer 10 in the IF frequency band is upconverted to an arbitrary frequency band, and the same as input multi-beam using switch matrix section SWM2 comprising selectors 56 to 59 and hybrid sections 60 to 63. Synthesize in a continuous band.

Thus, the satellite relay apparatus A5 according to the first to third embodiments performs setting of the

flexible switch matrices

9 and 11 in the command control apparatus A12 of the satellite relay apparatus A5 according to the request from the ground apparatus A0. Enables the input of an RF signal exceeding the channelizer input band and the output of an RF signal exceeding the channelizer output band.

Processing flow
Next, the processing flow of the ground apparatus A0 and the satellite relay apparatus A5 for setting the

flexible switch matrices

9 and 11 according to the first to third embodiments will be described with reference to FIG.

When this processing procedure is started (A40), the traffic control unit A6 in the line control unit A1 of the ground apparatus A0 requests a connection setting request from the command generation unit A8 of NOC_A4 in step A41.

Next, in step A42, the command generation unit A8 of NOC_A4 sends a connection setting request to the ground mission control device A3 in accordance with the request from the traffic control unit A6.
In step A43, the ground mission control device A3 determines whether or not all commands have been transmitted according to the connection setting request, and when all the commands have been transmitted, the process proceeds to step A44 and processing is stopped. Do.
On the other hand, if all the commands have not been transmitted in step A43, a command for changing the configuration of the

flexible switch matrix

9, 11 is generated in step A45, and the command control device A12 of the satellite relay device A5 is generated. Notify In step A46, the command control device A12 sets the configuration of each unit in the command control units A13 to A15 of each of the units 9 to 11. Then, in step A47, the command control units A13 to A15 set the configuration of each unit according to the request.

Next, in the satellite relay device A5 having the

flexible switch matrices

9 and 11 according to the first to third embodiments, band division of traffic exceeding the input band of the channelizer 10 and band combination of traffic exceeding the channelizer band are performed. The processing sequence for this will be described in the control sequence shown in FIG. 10 to FIG.

FIG. 10 shows an initial sequence for setting the satellite relay device A5. The ground device A0 sets up the satellite repeater A5 in accordance with the planned satellite configuration.

The traffic control unit A6 in the line control device A1 in the ground device A0 instructs the command generation unit A8 in the NOC_A4 as the connection setting request (A20) to the frequency band of the input / output beam and the number of band divisions. The command generation unit A8 of NOC_A4 is the configuration of the switch matrix units SWM1 and SWM2 of the satellite relay device A5 based on the frequency band of the input / output beam and the number of band divisions for which the connection setting request (A20) has been made. The conversion frequencies of to 27 and 48 to 51 are determined, and a connection setting request (A21) is notified to the ground mission control device A3.

The ground mission control device A3 sends a SELECTOR setting command (A22) to the command control device A12 in order to set the switches of the flexible switch matrix (input side) 9. When the command control device A12 receives the SELECTOR setting command (A22), the command control device A12 notifies the command control unit A13 of the flexible switch matrix (input side) 9 of the SELECTOR setting command (A23). In response to the notification (A23) of the SELECTOR setting command, the command control unit A13 performs selector setting (A24) for the selectors (SELECTOR) 20 to 27.

Next, the ground mission control device A3 transmits a conversion frequency setting command (A25) to the command control device A12 of the satellite relay device A5 in order to set the conversion frequency of the flexible switch matrix (input side) 9. When receiving the conversion frequency setting command (A25), the command control device A12 notifies the command control unit A13 of the modulation frequency setting command A26, and the command control unit A13 switches the flexible switch matrix (input side) 9 Set the matrix unit SWM1. The command control device A13 performs the conversion frequency setting (A27) of the tunable down converters 24 to 27 by receiving the modulation frequency setting command A26.

Next, the ground mission control device A3 requests the channelizing information (subcarrier switching information) of the digital channelizer 10 to the command control device A12 of the satellite relay device A5 using a channelizer setting command (A28). When receiving the request for the channelizer setting command (A28), the command control device A12 generates a channelizer setting command (A29), which is channelizing information, using the channelizer setting command (A28). The command control device A12 transmits the generated channelizer setting command (A29) to the command control unit A14 of the digital channelizer 10. When receiving the channelizer setting command (A29), the command control unit A14 performs setting (A30) of the digital channelizer 10.

Next, the ground mission control device A3 notifies the command control device A12 of the satellite relay device A5 of the conversion frequency setting command (A31) in order to set the conversion frequency of the flexible switch matrix (output side) 11. When receiving the conversion frequency setting command (A31), the command control device A12 sends a conversion frequency setting command (A32) for instructing the conversion frequency to the command control unit A15 of the flexible switch matrix (output side) 11. When receiving the conversion frequency setting command (A32), the command control unit A15 sets the conversion frequency of the tunable up converters 48 to 51 (A33).

Next, the ground mission control device A3 performs switch setting of the switch matrix unit SWM2 in order to combine the divided bands. Therefore, the ground mission control device A3 notifies the command control device A12 of the satellite relay device A5 of switch path information, that is, a SELECTOR setting command (A34). When receiving the SELECTOR setting command (A34), the command control device A12 transmits a SELECTOR setting command (A35) for instructing switch path information to the command control unit A15 of the flexible switch matrix (output side) 11, The setting (A36) of the selectors 56 to 59 is performed.

Next, FIG. 11 shows a UL (uplink) used band information acquisition sequence. When the call establishment / release (A149) occurs, the call control device A120 sends a line information notification (A150) to the traffic control unit A6. When receiving the line information notification (A150), the traffic control unit A6 calculates a use band, that is, a line usage rate (free line rate) based on the acquired line information notification (A150).

Here, UL use band information can also be calculated from satellite telemetry (A 152) notified from the satellite. That is, when the terrestrial mission control device A3 acquires satellite telemetry (UL power measurement information) A152 from the command control device A12 of the satellite relay device A5, UL power measurement measured for each subcarrier by the digital channelizer 10 in the telemetry The result is notified to the traffic monitoring unit A7 of NOC_A4 by the UL power measurement information notification (A153). The traffic monitoring unit A 7 uses the fact that the power is measured by the use of the line, and calculates the line use status from the power measurement result. The traffic monitoring unit A7 sends the calculated line use status notification (A154) to the traffic control unit A6 of the line control device A1. The traffic control unit A6 calculates the use band of the line, that is, the use rate (free line rate) based on the line use status notification (A154).

Next, the UL band addition sequence will be described with reference to FIG.
When the traffic control unit A6 of the line control device A1 makes a band addition determination (A160), it sends a band change notification (A164) to the call control device A120, and sends a connection setting request (A20) to the command generation unit A8 of NOC_A4. Send When receiving the connection setting request (A20) from the traffic control unit A6, the command generating unit A8 sends a connection setting request (A21) to the ground mission control device A3. When receiving the connection setting request (A21), the ground mission control device A3 sets the flexible switch matrix (input side) 9 and the digital channelizer 10, so that the selector setting command (A22), the conversion frequency setting command (A22) A25) The channelizer setting command (A28) is notified to the command control device A12 of the satellite relay device A5.
In addition, the command control device A12 checks the setting information of the selector setting command (A22), the conversion frequency setting command (A25), and the channelizer setting command (A28), and performs satellite telemetry (setting information confirmation) It transmits to ground mission control-apparatus A3 as A161). The ground mission control device A3, upon acquiring satellite telemetry (setting information confirmation) (A161) from the command control device A12 of the satellite relay device A5, sends a connection setting response (A162) to the command generation unit A8. When receiving the connection setting response (A162), the command generating unit A8 sends a connection setting response (A163) to the traffic control unit A6 of the line control device A1. Upon receiving the connection setting response (A163), the traffic control unit A6 determines that band addition has been performed (A160).

Next, a UL band deletion sequence is shown in FIG. The traffic control unit A6 of the line control device A1 sends a bandwidth change notification (A171) to the call control device A120 when it judges the removal of the bandwidth (A170). The call control device A120 performs the communication frequency change processing (A172) to the user using the UL band to be deleted, if necessary, and transmits a band change response (A173) to the traffic control unit A6 of the line control device A1. send.

The traffic control unit A6 of the line control device A1 sends a connection setting request (A20) to the command generation unit A8 of NOC_A4 along with the band deletion. The command generation unit A8 notifies the ground mission control device A3 of a connection setting request (A21). When receiving the connection setting request (A21), the ground mission control device A3 sets the flexible switch matrix (input side) 9 and the digital channelizer 10, so that the selector setting command (A22), the conversion frequency setting command (A22) A25) and the channelizer setting command (A28) are notified to the command control device A12 of the satellite relay device A5.
In addition, the command control device A12 checks the setting information of the selector setting command (A22), the conversion frequency setting command (A25), and the channelizer setting command (A28), and performs satellite telemetry (setting information confirmation) It transmits to ground mission control-apparatus A3 as A174. The ground mission control device A3, upon acquiring satellite telemetry (setting information confirmation) (A174) from the command control device A12 of the satellite relay device A5, sends a connection setting response (A175) to the command generation unit A8. When receiving the connection setting response (A176), the command generation unit A8 sends a connection setting response (A176) to the traffic control unit A6 of the line control device A1. When receiving the connection setting response (A176), the traffic control unit A6 determines that the band has been deleted (A170).

In this way, when band addition / deletion occurs and the UL band exceeds the digital channelizer band, the selection paths of SELECTORs 20 to 23 for band division of flexible switch matrix 9 and tunable down converters 24 to 27 Enables setting of conversion frequency.

Next, a DL (downlink) traffic control method will be described with reference to FIG. The call control device A 120 notifies the traffic control unit A 6 of the line control device A 1 of the DL line information (band) along with the call establishment / release (A 149). The traffic control unit A6 of the line control device A1 calculates the line usage rate (free line rate) based on the notified DL line information notification (A150), and determines addition / deletion of the DL band.
The determination as to the addition of the DL band is performed by the same algorithm as the determination as to the addition of the UL band, and the availability of the band is determined by comparing the use band A 140 described later with FIG.

Next, a DL used band information acquisition sequence will be described with reference to FIG. When the call establishment / release (A149) occurs, the call control device A120 notifies the traffic control unit A6 of the line control device A1 of the line information notification (A150). The traffic control unit A6 of the line control device A1 calculates the DL use band A 151 based on the line information notification (A150).

Next, the DL band addition sequence will be described with reference to FIG. The traffic control unit A6 of the line control device A1, upon making the band addition determination (A160), transmits a connection setting request (A20) to the command generation unit A8 of NOC_A4. When receiving the connection setting request (A20) from the traffic control unit A6, the command generating unit A8 sends a connection setting request (A21) to the ground mission control device A3. When receiving the connection setting request (A21), the ground mission control device A3 sets the digital channelizer 10 and the flexible switch matrix (output side) 11, so the channelizer setting command (A28), the conversion frequency setting command (A28) A31) and the selector setting command (A34) are notified to the command control device A12 of the satellite relay device A5.
Also, upon receiving the channelizer setting command (A28), the conversion frequency setting command (A31), and the selector setting command (A34), the command control device A12 confirms the setting information and performs satellite telemetry (setting) on the confirmed setting information. As information confirmation) (A161), it transmits to ground mission control device A3. The ground mission control device A3, upon acquiring satellite telemetry (setting information confirmation) (A161) from the command control device A12 of the satellite relay device A5, sends a connection setting response (A162) to the command generation unit A8. When receiving the connection setting response (A162), the command generating unit A8 sends a connection setting response (A163) to the traffic control unit A6 of the line control device A1. When receiving the connection setting response (A163), the traffic control unit A6 determines that the band addition has been performed (A160), and sends a band change notification (A164) to the call control apparatus (A120).

FIG. 16 shows a DL band deletion sequence. When the traffic control unit A6 of the line control device A1 determines that the bandwidth is to be deleted (A170), the traffic control unit A6 sends a bandwidth change notification (A171) to the call control device A120. The call control device A120 performs the communication frequency change processing (A172) to the user using the UL band to be deleted, if necessary, and transmits a band change response (A173) to the traffic control unit A6 of the line control device A1. contact. The traffic control unit A6 of the line control device A1 sends a connection setting request (A20) to the command generation unit A8 of NOC_A4 along with the band deletion.

The command generation unit A8 notifies the ground mission control device A3 of the connection setting request (A21). When receiving the connection setting request (A21), the ground mission control device A3 sets the digital channelizer 10 and the flexible switch matrix (output side) 11, so the channelizer setting command (A28), the conversion frequency setting command (A28) A31) and the selector setting command (A34) are notified to the command control device A12 of the satellite relay device A5.
Also, upon receiving the channelizer setting command (A28), the conversion frequency setting command (A31), and the selector setting command (A34), the command control device A12 confirms the setting information and performs satellite telemetry (setting) on the confirmed setting information. As information confirmation) (A174), it transmits to ground mission control device A3. The ground mission control device A3, upon acquiring satellite telemetry (setting information confirmation) (A174) from the command control device A12 of the satellite relay device A5, sends a connection setting response A175 to the command generation unit A8. When receiving the connection setting response (A175), the command generation unit A8 sends a connection setting response (A176) to the traffic control unit A6 of the line control device A1. Upon receiving the connection setting response (A176), the traffic control unit A6 determines that band addition has been performed (A170), and sends a band change notification (A173) to the call control apparatus (A120).

As described above, when the addition / deletion of the band occurs and the DL band exceeds the digital channelizer band, the connection is re-set and the flexible switch matrix 11 tunable up-converters 48 to 51 for band combination are generated. It is possible to change the selection path by setting the conversion frequency and the SELECTOR 56 to 59.

Embodiment 5
Next, a control algorithm for frequency band division of the flexible switch matrix (input side) 9 of the satellite relay apparatus of the fifth embodiment and frequency synthesis of the flexible switch matrix (output side) 11 will be described.

FIG. 17 shows a ground device A0 that monitors and controls traffic. Traffic control is performed by the call control device A 120, the traffic control unit A6 of the line control device A1, and the traffic monitoring unit A7 of the NOC_A4.

When the connection is established and released, the call control device A 120 notifies the traffic control unit A 6 of information (band) of the established and released connection. The traffic control unit A6 calculates, based on the notified connection information, the free band and the used band of the UL band and the DL band allocated to the beam. When this is applied to the GW beam, the vacant band A122 and the used band A123 are derived from the satellite GW band A121.

The UL free band A122 can also be derived from the reception power measurement result communicated from the ground mission control device A3. The traffic monitoring unit A7 of NOC_A4 derives the available bandwidth A124 and the used bandwidth A125 based on the power measurement information measured by the satellite, and notifies the traffic control unit A6 of the line control device A1. The traffic control unit A6 implements a band addition / deletion algorithm based on the free band information, and carries out the addition of the UL band and the change of the satellite configuration.

Next, an algorithm for changing the band of the UL beam and the DL beam accommodated in the satellite repeater A5 will be described with reference to FIGS.
FIG. 18 shows the ratio between the free band A 141 corresponding to the above-mentioned free band A 122 and the used band A 140 corresponding to the above used band A 123, and the band addition threshold A 131 and the band deletion threshold with respect to the entire band A 130 of UL beam. Set A132, and determine UL band addition / deletion. For example, in consideration of hysteresis, the band addition threshold A131 is set to 20% of the entire band, and the band removal threshold A132 is set to 80% of the whole band.

FIG. 19 shows an example of an algorithm using the ratio of the free band A 141 to the use band A 140 and the band addition threshold A 131 and the band deletion threshold A 132 described above.
If the use band A 140 exceeds the band addition threshold A 131 with respect to the whole band A 130 a in STEP 1, it is determined that band addition is necessary, the band is added (doubled) in STEP 2 and the whole band becomes A 130 b, band addition threshold For example, A131 is reset to 20% of the entire band A130b, and similarly, the band deletion threshold A132 is reset to 80% of the entire band A130b.
In STEP 3, since the use band A 140 is equal to or more than the band deletion threshold A 132 and equal to or less than the band addition threshold A 131, band addition / deletion control does not occur.
Next, in STEP 4, when the use band A 140 becomes equal to or less than the band deletion threshold A 132, the band is reduced (1/2), and the band addition threshold A 131 and the band deletion threshold A 132 are reset.
In actual control, the additional band and the band addition threshold A 131 and the band deletion threshold A 132 are determined so that the band addition / deletion determination does not chatter.

By this, by setting the band addition ratio of UL and the band addition threshold A 131 and the band deletion threshold A 132 to the used band ratio, it is possible to detect band addition and band reduction, and a satellite relay for band division. It enables setting of the input-side flexible switch matrix 9 of the device A5.

It is possible to apply a control algorithm similar to that of UL to DL as well, and determine addition and deletion of bands by adding band addition threshold A 131 and band deletion threshold A 132 to the used band rate. Can.

Thus, by setting the band addition threshold A 131 and the band deletion threshold A 132 to the use band ratio of DL and the use band ratio, addition of band and reduction of band can be detected, and satellite payload for band combination Enables setting of A5 output side flexible switch matrix 11

In this way, it is possible to control the number of splits of the input beam by detecting addition / deletion of the UL band according to the fluctuation of UL traffic and changing the setting of the flexible switch matrix on the input side. It is possible to control the combined band of the output beam by detecting addition / deletion of the DL band according to the fluctuation of traffic and changing the setting of the flexible switch matrix on the output side.

9, 11 flexible switch matrix (Flexible SW Matrix), 10 digital channelizer (Digital CHZ), 16 to 19, 60 to 63 hybrid part (HYB), 20 to 23, 56 to 59 selector (SELECTOR), 24 to 27 Tunable down converter (Tunable DCON), 48 to 51 tunable up converter (Tunable UPCON), 28 to 31, 52 to 55 BPF (band pass filter), A0 ground device, A1 line controller, A2 ground satellite GW ( Gateway), A3 Terrestrial Mission Controller, A4 NOC (Network Operating Center), A5 Satellite Payload, A6 Traffic Controller, A7 Traffic Monitoring , A8 command generating unit, A9 network, A10, A11 antenna, A12 command controller, A13 ~ A15 command control unit, A16 demultiplexer, A17 switch unit, A18 multiplexing section.

Claims

A digital channelizer that maps input multibeams in any frequency band to any output band;
An input-side flexible switch matrix that converts into a beam within the input frequency band of the digital channelizer according to a command from a ground device when the frequency band exceeds the input frequency band of the digital channelizer;
A satellite repeater comprising: an output-side flexible switch matrix that outputs the beam exchanged by the digital channelizer as a continuous band.
The input flexible switch matrix is
A switch matrix unit that divides the input multi-beam into a number set by the command;
A tunable down-converter for reducing the frequency band of each output beam of the switch matrix section to less than the input frequency band of the digital channelizer;
The satellite relay device according to claim 1, comprising: a band pass filter that outputs only a necessary frequency band in an output frequency band of the tunable down converter.
The input flexible switch matrix is
A switch matrix unit that divides the input multi-beam into a number set by the command;
The satellite relay according to claim 1, wherein the frequency band of the output beam of the switch matrix unit is reduced to less than the input frequency band of the digital channelizer according to the command and the RF channelizer outputs only a necessary frequency band. apparatus.
The switch matrix unit is
A hybrid unit for distributing the input multi-beams;
The satellite relay device according to claim 2 or 3, further comprising: a selector that selects each beam distributed by the hybrid unit only when designated by the command.
The output flexible switch matrix is
A tunable up-converter for converting the frequency band of the beam output from the digital channelizer into the frequency band instructed by the command;
A band pass filter for outputting a beam of only a necessary frequency band in a beam output from the tunable up converter;
The satellite relay apparatus according to claim 1, further comprising: a switch matrix unit that combines the beams output from the band pass filter and converts the combined beam into a continuous band.
The output flexible switch matrix is
An RF channelizer that converts a frequency band of a beam output from the digital channelizer into a frequency band instructed by the command and outputs a beam of only a necessary frequency band;
The satellite relay device according to claim 1, comprising: a switch matrix unit that combines the beams output from the RF channelizer and converts the combined beam into a continuous band.
The switch matrix unit is
A selector for passing a beam of only the required frequency band to one hybrid unit based on the command;
The satellite relay apparatus according to claim 5, wherein the hybrid unit combines the input beams.
The satellite relay according to any one of claims 1 to 3, further comprising a command control device for applying the command to the input flexible switch matrix, the digital channelizer, and the output flexible switch matrix. apparatus.
The above ground device
When the call is established, the use band of the call is calculated, and when the use band exceeds an additional threshold with respect to the full band of satellite payload, an additional band is requested, and the use band with respect to the full band A traffic control unit that generates a connection setting request that requests bandwidth reduction when the value falls below the reduction threshold;
9. The satellite relay according to claim 8, further comprising: a ground mission control device for transmitting a selector setting command, a digital channelizer setting command, and a converter frequency band setting command as the command to the command control device in response to the connection setting request. apparatus.
The satellite relay device according to claim 9, wherein the traffic control unit obtains frequency band information of the satellite payload from the command control device via the ground mission control device and calculates the use band.