KR101408079B1 - Data communication device of common data link communication system and operation method of the same - Google Patents

Abstract

A data communication apparatus and a method of operating the same in a public data link system are disclosed. According to embodiments of the present invention, a packet generating unit for generating a packet by adding packet identification information to video and signal data received from one or more sensors, a packet multiplexing unit for multiplexing and outputting the generated packets in time, A variable frame generation unit for assigning data bits of the output packet in order of a determined number of frames per second to generate a variable frame, and a variable frame generation unit for generating the generated variable frame at a variable transmission rate to the terrestrial communication apparatus A variable transmission rate transmission unit for transmitting the variable transmission rate, and a control unit. The control unit determines the number of frames per second based on the amount of data output from the packet multiplexing unit and controls the variable frame generating unit and the variable transmission rate transmitting unit to select the number of frames per second at the determined number of frames per second.

Description

TECHNICAL FIELD [0001] The present invention relates to a data communication apparatus and a data communication apparatus in a common data link communication system,

The present invention relates to a data communication apparatus of a public data link communication system capable of wirelessly transmitting image and signal data acquired by an image and signal detection sensor in a platform of a surveillance and reconnaissance system to a terrestrial communication apparatus and an operation method thereof.

Common Data Link (CDL) is a communication system and communication system developed for transmitting wirelessly the video information and the detected signal information captured by the surveillance and reconnaissance flight platform to a ground communication device located a long distance away. The communication speed is up to several hundred Mbps and the transmission speed is several tens to several hundred km.

These common data links (CDLs) can be applied to a wide range of fields from the industry to daily life, such as military, battlefield, fire, traffic, medical, environmental monitoring, building control and home network.

Meanwhile, a data communication device (hereinafter referred to as a communication device) of a conventional common public data link communication system receives image and signal data acquired by various sensors of a surveillance and reconnaissance platform, and multiplexes and generates frames. At this time, video and signal data used for surveillance and reconnaissance are transmitted as uncompressed raw data so that they can be analyzed precisely by terrestrial communication devices, so that the amount of data of video and signal data is always constant. Therefore, the conventional surveillance system requires a communication device with a fixed transmission rate that can transmit the maximum amount of data that can be generated by all sensors once the type and quantity of sensors to be mounted on the platform are determined.

A communication apparatus that receives video and signal data from a plurality of sensors having different amounts of data multiplexes video and signal data for transmission in a wireless link to form one frame. At this time, in the existing communication apparatus, the position and amount of data in the frame are fixedly allocated according to the sensor, and the terrestrial communication apparatus can determine from which sensor the data is generated from the position and amount of data in the received frame.

Existing communication apparatuses have a problem of wasting radio frequency bands because they are always transmitted at the maximum transmission speed even though it is not necessary to use some sensors because the transmission speed and the frame structure are fixed. In addition, when the sensor is replaced with a sensor having a data amount that is the same as that of a conventional sensor, and the sensor is replaced with a high-resolution sensor having a larger data amount, there is an inconvenience in changing the frame structure and modifying the communication device in accordance with the changed frame structure.

Therefore, the embodiments of the present invention can be applied to data of a public data link communication system capable of changing a frame structure and a transmission rate without modifying a communication device according to the type and data amount of a sensor connected to the data communication device of the public data link communication system And a communication method therefor.

To this end, a data communication apparatus of a public data link system according to an embodiment of the present invention includes: a packet generator for generating a plurality of packets by adding packet identification information to video and signal data received from one or more sensors; A packet multiplexing unit for multiplexing and outputting the generated packets in time; A variable frame generator for generating a variable frame by sequentially allocating the data bits of the output packet with the determined number of frames per second; A variable transmission rate transmitter for transmitting the generated variable frame at a variable transmission rate to the terrestrial communication apparatus at a determined number of frames per second; And a control unit for determining the number of frames per second based on the amount of data output from the packet multiplexing unit and controlling the variable frame generating unit and the variable transmission rate transmitting unit to select the number of frames per second at the determined number of frames per second .

In one embodiment, when the transmission rate at the variable transmission rate transmission unit is higher than the total data amount generated at the sensor, and there is no data bit of a packet to be output from the packet multiplexing unit to the variable frame generation unit, And an arbitrary value generator for providing the variable frame generator with a variable frame generator.

In one embodiment, the control unit determines whether or not each of the plurality of packets generated by the packet generation unit is used, and the control unit controls the packet multiplexing unit to select, from among the plurality of packets generated by the packet generation unit, Is determined.

In one embodiment, the packet multiplexer sets a transmission rate of a packet output to the variable frame generator to be higher than a total data amount input from the packet generator to the packet multiplexer.

In one embodiment, the variable frame generator is characterized in that the transmission rate is determined by changing the number of frames per second while keeping the length of the frame the same.

In one embodiment, the variable frame generation unit is configured to include a maximum number of frames per second corresponding to a maximum transmission rate, and to change the number of frames per second in an incremental step based on the maximum number of frames per second.

In one embodiment, the number of frames per second selected by the variable frame generator is the smallest value among the number of frames per second which is larger than the sum of the transmission speeds of the sensors.

According to another aspect of the present invention, there is provided a method of operating a data communication apparatus in a public data link system, the method comprising: generating a plurality of packets by adding packet identification information to video and signal data received from one or more sensors; Multiplexing the generated packets temporally and outputting the multiplexed packets; Determining a number of frames per second based on the amount of multiplexed and outputted data; Generating a variable frame by sequentially allocating the data bits of the output packet with the determined number of frames per second; And transmitting the generated variable frame to the terrestrial communication apparatus at a variable transmission rate at the determined number of frames per second.

Therefore, according to the data communication apparatus of the public data link communication system according to the embodiment of the present invention, the bit positions of the image and signal data can be changed according to the type of the connected sensor and the amount of data, It is easy to replace with a sensor having a different data amount. Furthermore, there is an advantage in that the frame transmission rate and the occupied bandwidth can be changed by selecting the frames per second in a stepwise manner.

1 is a block diagram showing a schematic structure of a communication apparatus of a general public data link communication system.
2 is a diagram illustrating a structure of a fixed frame generated by a communication device of a general public data link communication system.
3 is a block diagram showing a schematic structure of a communication apparatus of a public data link communication system related to the present invention.
4 is a view showing a variable frame structure generated by a communication device of a public data link communication system related to the present invention.
5 is a flowchart illustrating an operation method of a communication apparatus of a public data link communication system according to the present invention.

First, a communication apparatus according to an embodiment of the present invention can be applied to all systems that need to wirelessly transmit data acquired from a plurality of sensors in a surveillance and reconnaissance platform.

In addition, the present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Terms including ordinals such as first, second, etc. described herein can be used to describe various elements, but the elements are not limited to these terms. That is, the terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second provisional component may also be referred to as a first component. The term " and / or " includes any combination of a plurality of related listed items or any of a plurality of related listed yields.

Also, when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, but other elements may be present in between have. On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

Also, the terms used in the present application are used only to describe certain embodiments and are not intended to limit the present invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, Should not be construed to preclude the presence or addition of one or more other features, integers, steps, operations, elements, parts, or combinations thereof.

Also, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. The description will be omitted.

1 is a block diagram showing a schematic structure of a communication apparatus of a general public data link communication system. The communication device 20 shown in FIG. 1 receives image and signal data acquired by various sensors 10 on the platform of the surveillance reconnaissance system through the input terminals 21. A frame for the received video and signal data is generated and multiplexed through the frame generator 22 and output to the fixed rate transmitter 24 to be transmitted to the terrestrial communication device.

Since the conventional communication device 20 transmits the image and signal data used in the surveillance and reconnaissance system in an uncompressed raw data mode so that the terrestrial communication device can receive and analyze it precisely, The amount of data of video and signal data is always constant. Accordingly, the conventional communication device 20 has a fixed transmission rate capable of simultaneously transmitting data generated from all the sensors when the type and quantity of the sensors mounted on the platform of the conventional monitoring and scouting system are determined.

In this connection, Fig. 2 shows the structure of a fixed frame generated by a communication device of a general public data link communication system.

As shown in FIG. 2, the conventional communication device 20 multiplexes image and signal data received from a plurality of sensors having different amounts of data, and generates a frame that can be transmitted in a wireless network. At this time, in the frame generated by the conventional communication device 20, the type of the sensor and the number of data bits generated in the sensor are fixedly allocated for each bit position, and the terrestrial communication apparatus determines the position and amount of data in the received frame It is possible to determine whether the data is generated in the sensor.

Since the transmission rate of the communication apparatus is represented by the product of the number of frames per second and the number of bits included in each frame, the structure of the frame and the number of data bits generated by the conventional communication apparatus 20 are always fixed, Do. Accordingly, the occupied radio frequency band was always fixed.

That is, since the generated frame structure is fixedly allocated as shown in FIG. 2, even if unnecessary data is input due to a failure in some sensors during operation of the conventional communication device 20, And transmitted to the terrestrial communication apparatus, the occupied frequency band is wasted.

Further, when it is necessary to replace the sensor in the conventional public data link communication system, the sensor can be replaced only by a sensor having the same data amount as that of the existing sensor. In the case of replacing the sensor with a sensor having a larger data amount than the sensor used, After changing the frame structure of the device 20, it was necessary to perform operations such as increasing the transmission rate of the fixed rate transmitter and allocating more of the occupied radio frequency bandwidth.

In the early days when the public data link communication system was developed and operated, the frequency band of the public data link communication system was not short because the number of platforms of the monitoring and reconnaissance system was not sufficient. However, recently, Accordingly, a platform for various surveillance and reconnaissance systems has become necessary.

On the other hand, since the frequency band allocated to the public data link communication system is limited, the platforms of the surveillance and reconnaissance system should be divided into the platforms and the frequency bands of the other surveillance system. In this case, . ≪ / RTI > However, even when the sensor is selectively operated as above, the occupied frequency bandwidth can not be changed because the number of frames per second and the position of data bits per sensor in each frame are fixed.

The communication apparatus of the public data link communication system according to an embodiment of the present invention generates a packet by adding packet identification information to video and signal data received from sensors and generates a packet based on the data amount of the multiplexed packet. The number of frames is determined, a variable frame is generated based on the determined number of frames per second, and the frame is transmitted to the terrestrial communication apparatus at a variable transmission rate. Accordingly, it is possible to easily replace the existing sensor with a sensor having a different amount of data, and to provide a common data link communication system environment in which the occupied bandwidth can be changed by changing the transmission rate by selecting the number of frames per second.

3 is a block diagram showing a schematic structure of a communication apparatus of a public data link communication system related to the present invention.

3, a communication apparatus 100 of a public data link communication system according to an embodiment of the present invention receives and processes image and signal data from various sensors 10 performing surveillance and reconnaissance, And provides surveillance scouting data to the terrestrial communication device 200. The communication apparatus 100 includes a packet generator 100, a packet multiplexer 120, a variable frame generator 130, a variable transmission rate transmitter 140, and a controller 150 do.

The packet generating unit 110 adds identification information to video and signal data received from the one or more sensors 10 to generate a plurality of packets. Specifically, the packet generation unit 110 generates a packet for generating a packet, such as a start pattern of data, a sensor identifier, an overall length of a packet, and the like, in a header portion of video or signal data received from the sensors 10 200 to add additional information that can identify the packet to generate a packet. That is, the identification information added to the header of the generated packet allows the terrestrial communication apparatus 200 to identify which sensor transmitted the data contained in each packet.

The packet generator 110 is controlled by the controller 150. When the video or signal data provided from the sensors 10 are not used, the packet generator 110 converts the video or signal data to the packet multiplexer 120 Nor output.

The packet multiplexing unit 120 multiplexes the generated packets in time and outputs them. That is, since the packets generated by the packet generating unit 110 can not be transmitted simultaneously in the same wireless network, the packet multiplexing unit 120 multiplexes the generated packets sequentially or simultaneously, and sequentially arranges them.

The packet multiplexing unit 120 multiplexes the amount of data per second output from the packet generating unit 110 to the packet multiplexing unit 120, which is input to the packet multiplexing unit 120, It is preferable to set it higher than the data amount. If the transmission rate output to the variable frame generation unit 130 is set to be slower than the amount of data input to the packet multiplexing unit 120, a part of the packet data input to the packet multiplexing unit 120 may be lost to be.

On the other hand, if the total amount of data input from all the sensors 10 is lower than the transmission speed of the communication device 100, there may be no image or signal data of the sensor to be sent to the communication device 100 at a specific time. In this case, it is desirable to construct a frame so as to transmit arbitrary data instead of the data of the sensor 10, since a specific signal must be transmitted through the wireless network.

The communication apparatus 100 may be configured such that the transmission rate of the variable transmission rate transmission unit 140 is higher than the total amount of data generated by the sensor 10 so that the transmission rate of the variable frame generation unit 130 from the packet multiplexing unit 120, If there is no data bit of the packet to be output to the variable frame generator 130, the variable frame generator 130 can generate an arbitrary value and provide it to the variable frame generator 130. To this end, the communication device 100 may further include an arbitrary value generation unit 115 for generating such an arbitrary value.

For example, when the transmission rate output to the variable frame generation unit 130 is set to be higher than the amount of data input to the packet multiplexing unit 120, in this case, the variable frame generation unit 130 receives, from the packet multiplexing unit 120, There is a case in which there is no data to be output to the system.

In order to prevent this, the communication apparatus 100 according to the embodiment of the present invention is configured such that when the packet multiplexing unit 120 does not have data to be output to the variable frame generating unit 130, (E.g., bits 0 and 1) to the variable frame generator 130. [

In addition, the variable frame generation unit 130 can change the frame rate per second and determine the transmission rate differently while maintaining the same frame length. This is because the transmission rate is changed when the length of the frame is changed, and the processing method of the variable transmission rate transmission unit 140 is changed each time.

In addition, the variable frame generation unit 130 may determine the transmission rate differently by changing the number of frames per second in an incremental step based on the maximum number of frames per second including the maximum number of frames per second corresponding to the maximum transmission rate have.

Unlike the conventional communication device 20 (FIG. 1) in which the transmission rate, which is the product of the number of frames per second and the number of data bits contained in the frame, is fixed, the communication device 100 of the present invention adjusts the number of frames per second , The transmission rate can be changed.

At this time, the initial number of frames per second is set to be larger than the total data amount of the packet that the sensor 10 in actual use uses to generate identification information (or additional information) in the video and signal data. And adjusts the number of frames per second step by step. For example, the variable frame generator 130 can determine the transmission rate by changing the number of frames generated per second while maintaining the same length of one frame.

That is, the variable frame generation unit 130 includes the maximum number of frames per second corresponding to the maximum transmission rate of the communication apparatus 100, and the variable frame generation unit 130 sets the variable frame generation unit 130 in several steps such as 1/2, 1/3, 2/5, By changing the number of frames per second, the transmission rate can be determined differently. For example, in FIG. 4, the number of frames per second is represented by N, and the value of N may be selected as one of several steps to change the transmission rate, thereby changing the occupied frequency bandwidth.

At this time, the number of frames per second selected by the variable frame generator 130 may be selected to be the smallest among the frames per second, which is greater than the total transmission rate of the sensor 10, for efficient operation. Further, the determination of the number of frames per second may be performed through the control unit 150. [

The variable transmission rate transmission unit 140 transmits the variable frame generated by the variable frame generation unit 130 to the terrestrial communication device 200 at a variable transmission rate with the determined number of frames per second. That is, the variable transmission rate transmission unit 140 transmits a frame at a variable transmission rate when a large number of sensors are operated at the same time and a high transmission rate is required, or when only a part of the sensors is operated and a required transmission rate is low .

The variable rate transmission unit 140 transmits the data bits (0, 1) output from the variable frame generation unit 130 to the wireless communication unit 130 at a transmission rate which is a product of the number of frames per second and the number of frame data bits selected by the control unit 150 Modulates it into a communication signal suitable for the link, and then transmits it to the terrestrial communication apparatus 200. At this time, the modulated radio signal may have a difference in occupied bandwidth depending on the communication method occupying the frequency bandwidth, but it generally increases in proportion to the transmission speed in the same communication method. Accordingly, the transmission speed of the radio signal transmitted by the variable-speed transmitter unit 140 of the communication device 100 according to the embodiment of the present invention varies depending on the number of frames per second, and accordingly the bandwidth occupied by the radio signal varies.

The control unit 150 controls the overall operation of the communication device 100. Specifically, the control unit 150 may determine the number of frames per second based on the amount of data output from the packet multiplexing unit 120.

The controller 150 provides the determined number of frames per second and controls the variable frame generator 130 and the variable transmission rate transmitter 140 to select the number of frames per second determined by the controller 150 have.

In addition, the controller 150 can determine whether or not each of a plurality of packets generated by the packet generator 110 is used. In addition, the controller 150 can determine whether to use the sensor 100 and the resolution, and can recognize the total sum of the transmission speeds of all the operating sensors.

The control unit 150 may determine the order of multiplexing a plurality of packets generated by the packet generation unit 110 and random values generated by the random value generation unit 115 in the packet multiplexing unit 120 have.

4 is a view showing a variable frame structure generated by a communication device of a public data link communication system related to the present invention.

As shown in FIG. 4, the image or signal data input from the sensors 10 are converted into packets to which the identification information is added (110_A). As shown, if there is no received video or signal data, any value may be input. Based on the added identification information, the generated packets generate a frame in which the data bit position of the sensor is variable according to the type and data amount of the sensor to be used (130_A). At this time, the number of frames (#N) generated by the variable frame generation unit 130 is determined by the control unit based on the amount of data output from the packet multiplexing unit 120.

Hereinafter, an operation method of the communication apparatus of the public data link communication system related to the present invention will be described with reference to FIG.

5, a communication device 100 (FIG. 3) of a public data link communication system according to an embodiment of the present invention firstly transmits the image and signal data received from one or more sensors 10 (FIG. 3) The identification information is added, and a step of generating a plurality of packets is performed (S510). Then, the generated packets are temporally multiplexed and output (S520).

When the generated packets are multiplexed, the controller 150 (Fig. 3) of the communication apparatus 100 determines the number of frames per second based on the amount of multiplexed data output (S530). Subsequently, the communication apparatus 100 sequentially allocates the data bits of the output packet at a determined number of frames per second to generate a variable frame (S540). Then, with the determined number of frames per second, the generated variable frame is transmitted to the terrestrial communication apparatus 200 (Fig. 3) at a variable transmission rate.

As described above, according to the data communication apparatus of the public data link communication system according to the embodiment of the present invention, the data position and the data amount in the frame of the video and the signal data are changed according to the type of the connected sensor and the amount of data It is possible to select an optimum transmission rate which can be changed and which is suitable for the sum of the amount of data generated by the sensors. Therefore, it is possible to replace the communication device with a sensor of a different type and amount of data without modifying the communication device, and it is possible to avoid wasting the radio frequency band by selecting a transmission rate corresponding to the data amount of an actually used sensor.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, And may be modified, changed, or improved in various forms. Further, the method according to the present invention described herein can be implemented in software, hardware, or a combination thereof. For example, a method according to the present invention may be stored in a software program that can be stored in a storage medium (e.g., terminal internal memory, flash memory, hard disk, etc.) and executed by a processor May be implemented with embedded codes or instructions.

Claims (8)

A packet generation unit for generating packets by adding packet identification information to video and signal data received from one or more sensors;
A packet multiplexing unit for multiplexing the generated packets in time;
A variable frame generator for generating a variable frame by sequentially allocating the data bits of the output packet with the determined number of frames per second;
A variable transmission rate transmitter for transmitting the generated variable frame at a variable transmission rate to the terrestrial communication apparatus at a determined number of frames per second; And
And a control unit for determining the number of frames per second based on the amount of data output from the packet multiplexing unit and controlling the variable frame generating unit and the variable transmission rate transmitting unit to select the number of frames per second at the determined number of frames per second Characterized in that the data communication device of the public data link system. The method according to claim 1,
When the transmission rate in the variable transmission rate transmission unit is higher than the total data amount generated in the sensor and there is no data bit of a packet to be output from the packet multiplexing unit to the variable frame generation unit,
And an arbitrary value generator for generating an arbitrary value and providing the arbitrary value to the variable frame generator. 3. The method of claim 2,
Wherein,
Determines whether or not each of the plurality of packets generated by the packet generating unit is used and determines a sequence of multiplexing a plurality of packets by the packet generating unit and an arbitrary value by the random value generating unit in the packet multiplexing unit Of the data communication system of the public data link system. The method according to claim 1,
Wherein the packet multiplexing unit comprises:
Wherein the transmission rate of a packet output to the variable frame generation unit is set to be higher than the total amount of data input from the packet generation unit to the packet multiplexing unit. The method according to claim 1,
Wherein the variable-
Wherein the transmission rate is determined by changing the number of frames per second while maintaining the same length of the frame. 6. The method of claim 5,
Wherein the variable-
The maximum number of frames per second corresponding to the maximum transmission rate, and the number of frames per second is changed in an incremental step based on the maximum number of frames per second. The method according to claim 1,
Wherein the number of frames per second selected by the variable frame generation unit is the smallest value among the number of frames per second which is larger than the sum of the transmission speeds of the sensors. Generating packets by adding packet identification information to video and signal data received from one or more sensors;
Multiplexing the generated packets temporally and outputting the multiplexed packets;
Determining a number of frames per second based on the amount of data of the temporally multiplexed and outputted packet;
Generating a variable frame by sequentially allocating the data bits of the output packet with the determined number of frames per second; And
And transmitting the generated variable frame at a variable transmission rate to the terrestrial communication apparatus at the determined number of frames per second.

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