CN117761622A - satellite tracking system - Google Patents

Abstract

The present application relates to a satellite tracking system comprising: the antenna array is used for receiving multipath incoming wave signals sent by the tracking satellite; the transmission module is connected with the antenna array and used for transmitting the multipath incoming wave signals to the radio platform; the radio platform determines the transmitting angles of the multipath incoming wave signals according to the phase differences among the multipath incoming wave signals and the antenna arrangement distances in the antenna array; and determining the position information of the tracking satellite according to the emission angles of the multipath incoming wave signals. The method and the device can reduce the complexity of the tracking system.

Description

satellite tracking system

Technical field

The present application relates to the field of communication technology, and in particular to a satellite tracking system.

Background technique

With the rapid development of satellite communication technology and applications, low-orbit satellite Internet is increasing day by day. The low-orbit satellite system is in the visible arc section of the satellite, and the mechanical antenna pointing of its ground station needs to move with the satellite. Especially for a large number of satellites deployed in a constellation, each satellite has the same technical parameters, and the ground station uses the same number of antennas for communication services. These antennas form a resource pool and jointly serve the satellites in the constellation. Usually there are several antennas in an antenna field, forming an antenna array. The low-orbit satellite system operation control center carries out task planning, allocation, scheduling of the antenna array, and collects the operation status of the antenna.

In traditional technology, the antenna array in the satellite tracking system adopts the principle of differential beam angle measurement.

However, sum-difference beam amplitude ratio measurement requires the use of two beams, which increases the complexity and cost of the entire system. Therefore, it is in urgent need of improvement.

Contents of the invention

Based on this, it is necessary to provide a satellite tracking system that can reduce the complexity of the tracking system to address the above technical problems.

This application provides a satellite tracking system, which includes:

Antenna array, the antenna array is used to receive multiple incoming wave signals sent by the tracking satellite;

A transmission module, connected to the antenna array, used to determine the emission angle of the multi-channel incoming wave signals based on the phase difference between the multi-channel incoming wave signals and the antenna layout distance in the antenna array;

According to the emission angle of the multi-channel incoming wave signals, the position information of the tracking satellite is determined.

In one embodiment, the transmission module includes:

The switch submodule is used to control the on and off transmission lines between the antenna array and the radio platform;

The frequency conversion sub-module is used to perform frequency conversion processing on multiple incoming signals according to the target frequency of the radio platform.

In one embodiment, the multiple incoming wave signals include a first incoming wave signal and a second incoming wave signal, and the first incoming wave signal is received by the first antenna unit in the antenna array, and the second incoming wave signal is received by the antenna array. The second antenna unit in the antenna receives, and the first antenna unit and the second antenna unit are adjacent; the radio platform determines the multi-channel incoming waves based on the phase difference between the multi-channel incoming wave signals and the antenna layout distance in the antenna array. The emission angle of the signal, specifically used for:

The emission angle of the first incoming wave signal is determined based on the phase difference between the first incoming wave signal and the second incoming wave signal, the frequency of the first incoming wave signal, and the layout distance between the first antenna and the second antenna.

In one embodiment, the frequency conversion sub-module is specifically used for:

Adjust the signal frequencies of the multiple incoming signals to the target frequency of the radio platform, and keep the phase difference between the multiple incoming signals unchanged.

In one embodiment, the position information of the tracking satellite includes a pitch angle value of the tracking satellite.

In one embodiment, the switch submodule includes a mechanical switch.

In one embodiment, each antenna unit in the antenna array includes two polarization modes: left-hand circular polarization and right-hand circular polarization.

In one embodiment, an error compensation signal corresponding to the error situation is obtained; wherein the error situation is determined based on the error signal strength and the error signal environment;

If the signal strength of the incoming wave signal reaches the error signal strength, or the current environment and the error signal environment are successfully matched, the multi-channel signal is determined based on the error compensation signal, the phase difference between the multi-channel incoming wave signals, and the antenna layout distance in the antenna array. The emission angle of the incoming wave signal.

For the above-mentioned satellite tracking system, the radio platform in this application only needs to use a preset angle measurement algorithm to determine the angle value of the tracking satellite based on the transmission angle corresponding to the multi-channel incoming wave signal. Compared with the difference beam angle measurement in traditional technology, it only needs One beam reduces the complexity and cost of the entire system.

Description of drawings

Figure 1 is a schematic diagram of a satellite tracking system in one embodiment;

Figure 2 is a schematic diagram of a satellite tracking system in another embodiment;

Figure 3 is a schematic diagram of a first antenna unit and a second antenna unit in an embodiment;

Figure 4 is a schematic flow diagram of an incoming signal in one embodiment.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present application more clear, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application and are not used to limit the present application.

As shown in Figure 1, this application provides a satellite tracking system, including: an antenna array, a transmission module and a radio platform; wherein,

Antenna array, the antenna array is used to receive multiple incoming wave signals sent by tracking satellites.

A transmission module, connected to the antenna array, used to determine the emission angle of the multi-channel incoming wave signals based on the phase difference between the multi-channel incoming wave signals and the antenna layout distance in the antenna array;

According to the emission angle of the multi-channel incoming wave signals, the position information of the tracking satellite is determined.

It can be understood that the antenna array includes multiple antenna units; optionally, the satellite tracking system in this embodiment may include four antenna units for receiving incoming wave signals reflected back by the tracking satellite; where the tracking satellite is Satellites being tracked. Furthermore, each antenna unit contains two polarization modes: left-hand circular polarization and right-hand circular polarization. Only two vertical or horizontal antenna units receive satellite signals at a time. When the satellite deviates from the antenna unit by an angle, the vertical or horizontal The two antenna units can receive signals containing pitch or horizontal angle information respectively.

Optionally, the transmission module may include multiple transmission lines for transmitting signals between the antenna array and the radio platform.

Optionally, the radio platform can complete the comparison of the phases of the two-channel received signals in the FPGA after being processed by the AD9361 software radio platform to realize the processing of transferring the analog signal to the digital domain. Data communication uses RS485 to complete the data interaction between the single board and the outside world.

For the above-mentioned satellite tracking system, the radio platform in this application only needs to use a preset angle measurement algorithm to determine the angle value of the tracking satellite based on the transmission angle corresponding to the multi-channel incoming wave signal. Compared with the difference beam angle measurement in traditional technology, it only needs One beam reduces the complexity and cost of the entire system.

In one embodiment, as shown in Figure 2, the transmission module includes: a switch sub-module and a frequency conversion sub-module. The switch sub-module is used to control on and off the transmission line between the antenna array and the radio platform; the frequency conversion sub-module is used to It performs frequency conversion processing on multiple incoming wave signals according to the target frequency of the radio platform.

Among them, the switch sub-module includes a mechanical switch.

Correspondingly, as shown in Figures 3 and 4, the multiple incoming wave signals include a first incoming wave signal and a second incoming wave signal, and the first incoming wave signal is received by the first antenna unit in the antenna array, and the second incoming wave signal is received by the first antenna unit in the antenna array. The wave signal is received by the second antenna unit in the antenna array, and the first antenna unit and the second antenna unit are adjacent; the radio platform based on the phase difference between the multi-channel wave signals and the antenna layout distance in the antenna array, Determine the emission angle of multiple incoming wave signals, specifically used for:

The emission angle of the first incoming wave signal is determined based on the phase difference between the first incoming wave signal and the second incoming wave signal, the frequency of the first incoming wave signal, and the layout distance between the first antenna and the second antenna.

It can be understood that the emission angle corresponding to each multi-channel incoming wave signal is set to θ, which is an unknown quantity θ;

The antenna layout distance between the first antenna unit and the second antenna unit is d, and the delay distance L= dsinθ; the phase difference between the first incoming wave signal and the second incoming wave signal is Δφ; the sum of θ and Δφ is 90°, L represents the variable distance of wave propagation.

It can be understood that based on Figure 3 and Figure 4, the following formulas (1) ~ (6) are obtained to determine the phase difference between the first incoming wave signal and the second incoming wave signal; where:

Among them, λ is the wavelength of the incoming wave signal, which is determined according to the frequency of the incoming wave signal.

Optionally, the frequency conversion submodule is specifically used to: adjust the signal frequencies of multiple incoming wave signals to the target frequency of the radio platform, and keep the phase difference between the multiple incoming wave signals unchanged.

In one embodiment, the position information of the tracking satellite includes a pitch angle value of the tracking satellite.

The radio platform is used to determine the emission angle of multiple incoming signals based on the phase difference between the multiple incoming signals and the antenna layout distance in the antenna array. It is specifically used for:

Obtain the error compensation signal corresponding to the error situation; if the signal strength of the incoming wave signal reaches the error signal strength, or the current environment and the error signal environment are successfully matched, the error compensation signal, the phase difference between the multi-channel incoming wave signals, and the antenna The arrangement distance of the antennas in the array determines the emission angle of the multi-channel incoming wave signals.

Among them, the error situation is determined based on the error signal strength (meaning that the strength of the signal is less than the threshold) and the error signal environment (the degree of interference caused by the environment to signal propagation reaches the corresponding threshold).

It is understandable that the signal strength of the signal may change under different environmental information (such as clouds, temperature). In the case of errors, the emission angle determined based on the incoming signal may also have errors.

In the test environment of the satellite tracking system in this embodiment, a positioning module can be provided on the tracking satellite. The positioning module can send real-time positioning information to the satellite tracking system in this embodiment, and obtain the historical information of the satellite tracking system in case of errors. Satellite position information determined by incoming wave signals;

The difference between the real-time positioning information and the satellite position information determined based on historical incoming signals is used to determine the error compensation signal.

During the use of the satellite tracking system, if the signal strength of the incoming signal reaches the error signal strength, or the current environment and the error signal environment are successfully matched, the emission angle of the multi-channel incoming signal will be compensated based on the error compensation signal.

The technical features of the above embodiments can be combined in any way. To simplify the description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, all possible combinations should be used. It is considered to be within the scope of this manual.

The above embodiments only express several implementation modes of the present application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the patent scope of the present application. It should be noted that, for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all fall within the protection scope of the present application. Therefore, the scope of protection of this application should be determined by the appended claims.

Claims (8)

1. A satellite tracking system, characterized in that the satellite tracking system includes: An antenna array, the antenna array is used to receive multiple incoming wave signals sent by the tracking satellite; A transmission module, connected to the antenna array, used to transmit multiple incoming wave signals to the radio platform; Wherein, the radio platform is used to determine the emission angle of the multiple incoming signals based on the phase difference between the multiple incoming signals and the antenna layout distance in the antenna array; The position information of the tracking satellite is determined based on the transmission angle of the multi-channel incoming wave signals. 2. The satellite tracking system according to claim 1, characterized in that the transmission module includes: A switch sub-module, used for on-off control of the transmission line between the antenna array and the radio platform; The frequency conversion sub-module is used to perform frequency conversion processing on multiple incoming signals according to the target frequency of the radio platform. 3. The satellite tracking system according to claim 2, wherein the multiple incoming wave signals include a first incoming wave signal and a second incoming wave signal, and the first incoming wave signal is transmitted by the antenna array. The second incoming wave signal is received by the second antenna unit in the antenna array, and the first antenna unit and the second antenna unit are adjacent; the radio platform is According to the phase difference between the multi-channel incoming wave signals and the antenna layout distance in the antenna array, the emission angle of the multi-channel incoming wave signals is determined, specifically for: The phase difference between the first incoming wave signal and the second incoming wave signal, the frequency of the first incoming wave signal, and the layout distance between the first antenna unit and the second antenna unit are determined. The emission angle of the first incoming wave signal and the second incoming wave signal. 4. The satellite tracking system according to claim 1, characterized in that the frequency conversion sub-module is specifically used for: The signal frequencies of the multiple incoming wave signals are all adjusted to the target frequency of the radio platform, and the phase difference between the multiple incoming wave signals remains unchanged. 5. The satellite tracking system according to claim 1, wherein the position information of the tracking satellite includes the pitch angle value of the tracking satellite. 6. The satellite tracking system according to claim 2, characterized in that the switch submodule comprises a mechanical switch. 7. The satellite tracking system according to claim 1, wherein each antenna unit in the antenna array includes two polarization modes: left-hand circular polarization and right-hand circular polarization. 8. The method according to claim 1, characterized in that the radio platform is used to determine the transmission of multiple incoming signals based on the phase difference between the multiple incoming signals and the antenna layout distance in the antenna array. angle, specifically used for: Obtaining an error compensation signal corresponding to the error situation; wherein the error situation is determined based on the error signal strength and the error signal environment; If the signal strength of the incoming wave signal reaches the error signal strength, or the current environment successfully matches the error signal environment, the error compensation signal, the phase difference between the multi-channel incoming wave signals, and the phase difference in the antenna array will be used. The antenna layout distance determines the emission angle of multiple incoming wave signals.