Airborne double-frequency double-antenna ultrashort wave communication system and method

Abstract

The invention provides an airborne dual-frequency dual-antenna ultrashort wave communication system, an airborne system works at a first frequency and a second frequency, and a ground station is configured to work at the first frequency. Comprising the steps that a first ultra-short wave communication link and a second ultra-short wave communication link transmit signals at a first frequency or a second frequency according to control and receive radio frequency signals at the first frequency and the second frequency at the same time; the digital signal processing module is used for acquiring a radio frequency signal received by the ultra-short wave communication link and demodulating the radio frequency signal to obtain received voice or data; and determining an optimal link communicating with the ground station according to the ground station information and the aircraft inertial navigation information, and controlling the link to transmit the radio frequency signal at the first frequency and the other link to transmit the radio frequency signal at the second frequency. According to the invention, channel resources do not need to be additionally increased during receiving, the effective coverage range of a transmitting airspace is improved, an adaptive transmitting strategy is provided, a ground station does not need to be modified, and high-reliability communication in air-to-air and air-to-ground multi-task scenes is ensured.

Description

Technical Field

[0001] The present invention relates to the field of airborne communications, and in particular to an airborne dual-frequency dual-antenna ultra-short wave communication system and method. Background Art

[0002] The traditional airborne ultra-short wave communication function is half-duplex communication, where reception and transmission work at the same frequency. Each ultra-short wave communication link is usually equipped with one antenna and one receiving and one transmitting channel for voice or data signal transmission and reception. However, during the aircraft's circling and turning maneuvering flight, there is a high probability of communication interruption. The main reason is that the antenna pattern is distorted by the body after installation, and the antenna gain at some angles of azimuth and pitch cannot meet the communication distance requirements. For example, the antenna installed on the back of the aircraft has relatively weak coverage of the airspace on the belly, and the antenna installed on the belly has relatively weak coverage of the airspace on the back of the aircraft, resulting in insufficient communication margin and communication interruption. Therefore, the communication system using a single antenna will affect the communication effect during the aircraft's turning and maneuvering. To solve this problem, the airborne ultra-short wave link is usually equipped with two ultra-short wave antennas. The dual-antenna diversity reception technology is used to improve the received signal-to-noise ratio during reception. At the same time, the transmission selects the antenna with the highest signal-to-noise ratio in the most recent reception for single antenna transmission.

[0003] The communication function of dual-antenna diversity reception and single-antenna transmission has the following shortcomings: dual-antenna reception can utilize the airspace coverage superposition performance of the two antennas, improve the antenna gain airspace compliance rate, and improve the communication effect during aircraft circling or turning maneuvers. However, since the transmission uses a single antenna, the transmission communication capability is only the airspace coverage capability of a single antenna. If there are multiple communication objects and they are in different spatial positions, there will be problems of insufficient communication distance between individual communication objects and unreliable communication; or when communicating with ground communication objects, if an antenna with poor coverage is selected for transmission, reliable air-to-ground communication cannot be guaranteed. Summary of the invention

[0004] In order to overcome the problem of insufficient airspace coverage of single-antenna transmission, an airborne dual-frequency dual-antenna ultra-short wave communication system and method are proposed. Without increasing the channel hardware resources, the transmission strategy is adaptively adjusted based on the real-time flight position and flight attitude, which solves the problem of insufficient airspace coverage of ultra-short wave single antenna transmission on the airborne platform, resulting in the communication distance in some airspace not meeting the requirements.

[0005] The first aspect of the present invention provides an airborne dual-frequency dual-antenna ultra-short wave communication system, wherein the airborne system operates at a first frequency and a second frequency, and the ground station is configured to operate at the first frequency, comprising:

[0006] A first ultra-short wave communication link is connected to the digital signal processing module and is used to transmit signals at a first frequency or a second frequency according to control and to simultaneously receive radio frequency signals at the first frequency and the second frequency;

[0007] A second ultra-short wave communication link is connected to the digital signal processing module and is used to transmit a radio frequency signal at a first frequency or a second frequency according to the control and to simultaneously receive radio frequency signals at the first frequency and the second frequency;

[0008] The digital signal processing module is used to obtain the radio frequency signals received by the first ultra-short wave communication link and the second ultra-short wave communication link, and demodulate to obtain the received voice or data; and determine the optimal link for communicating with the ground station according to the ground station information and the aircraft inertial navigation information, and control the link to transmit the radio frequency signal at the first frequency, and the other link to transmit the radio frequency signal at the second frequency.

[0009] As a preferred solution, the first ultrashort wave communication link includes a first antenna, a first receiving channel, and a first transmitting channel. The first antenna is connected to the digital signal processing module through the first receiving channel and the first transmitting channel, respectively, radiates a radio frequency signal of a first frequency or a second frequency through the first transmitting channel, and simultaneously receives radio frequency signals of the first frequency and the second frequency through the first receiving channel.

[0010] As a preferred solution, the second ultrashort wave communication link includes a second antenna, a second receiving channel, and a second transmitting channel. The second antenna is connected to the digital signal processing module through the second receiving channel and the second transmitting channel, respectively, radiates a radio frequency signal of the first frequency or the second frequency through the second transmitting channel, and simultaneously receives radio frequency signals of the first frequency and the second frequency through the second receiving channel.

[0011] As a preferred solution, the digital signal processing module includes:

[0012] A digital channel receiving and processing module is connected to the first receiving channel and the second receiving channel, and is used to combine and receive the received four-way diversity receiving signals, and demodulate and output voice or data;

[0013] The optimal antenna calculation module determines the current position and attitude of the aircraft based on the preset ground station information and periodic inertial navigation data, and then determines the optimal antenna for communicating with the ground station;

[0014] The transmission parameter control and modulation module is connected to the first transmission channel and the second transmission channel, and is used to control the transmission channel corresponding to the optimal antenna to operate at the same frequency as the ground station, that is, the first frequency, and the transmission channel corresponding to the other antenna to operate at the second frequency, and modulate the signal to transmit voice or data.

[0015] As a preferred solution, the first antenna is connected to the first receiving channel and the first transmitting channel through the first transceiver switch, and the second antenna is connected to the second receiving channel and the second transmitting channel through the second transceiver switch; wherein, when the system detects that the transmission is enabled, the first transceiver switch and the second transceiver switch are switched to be connected to the transmitting channel, otherwise they are connected to the receiving channel.

[0016] As a preferred solution, an analog-to-digital conversion unit is provided between the first receiving channel, the second receiving channel and the digital channel receiving and processing module; a digital-to-analog conversion unit is provided between the first transmitting channel, the second transmitting channel and the transmitting parameter control and modulation module.

[0017] As a preferred scheme, the center frequency of the first receiving channel and the second receiving channel is a third frequency, wherein the third frequency = (first frequency + second frequency) / 2; |second frequency - first frequency| > transmission signal bandwidth; receiving filter bandwidth = (|second frequency - first frequency| + transmission signal bandwidth).

[0018] The second aspect of the present invention provides an airborne dual-frequency dual-antenna ultra-short wave communication method, which is applied to a dual-antenna airborne communication system, comprising:

[0019] Configuring the operating frequency of the airborne system to be a first frequency and a second frequency, wherein the first frequency is the operating frequency of the ground station;

[0020] Controlling the receiving channel of the dual antenna to operate at a third frequency, wherein the third frequency = (first frequency + second frequency) / 2;

[0021] When the function transmission enable is invalid, multiple signals are received at the same time and processed and demodulated to obtain voice or data;

[0022] When the function transmission enable is valid, the optimal antenna for communicating with the ground station is determined, and the transmission channel of the optimal antenna is controlled to operate at a first frequency, and the other antenna operates at a second frequency to modulate the signal and transmit voice or data.

[0023] As a preferred solution, the determining of the optimal antenna for communicating with the ground station specifically includes:

[0024] Determine the location of the ground station based on the preset information of the airborne system;

[0025] Extract aircraft position, attitude, and flight heading based on aircraft periodic inertial navigation information;

[0026] Calculate the optimal antenna for communicating with ground stations.

[0027] Compared with the prior art, the beneficial effects of adopting the above technical solution are as follows: the present invention does not require additional channel resources when receiving, which improves the effective coverage of the transmitting airspace, and at the same time has an adaptive transmission strategy, and the ultra-short wave ground station does not need to be modified, ensuring high-reliability communication in air-to-air and air-to-ground multi-task scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the airborne dual-frequency dual-antenna ultra-short wave communication system proposed by the present invention.

[0029] Figure 2 This is a flow chart of the airborne dual-frequency dual-antenna ultra-short wave communication method proposed by the present invention. DETAILED DESCRIPTION

[0030] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar modules or modules with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be construed as limitations on the present application. On the contrary, the embodiments of the present application include all changes, modifications and equivalents that fall within the spirit and connotation of the appended claims.

[0031] Example 1

[0032] In view of the shortcomings of the existing airborne ultra-short wave dual-antenna communication system, an airborne dual-frequency dual-antenna ultra-short wave communication system is provided, which has a larger transmission airspace coverage and more reliable communication quality, while not increasing additional channel hardware resources and has high resource utilization.

[0033] Please refer to Figure 1 , the airborne dual-frequency dual-antenna ultra-short wave communication system provides two operating frequencies, a first frequency and a second frequency, and the ground station is configured to work at the first frequency. Specifically, the system includes a first ultra-short wave communication link, connected to a digital signal processing module, used to transmit signals at the first frequency or the second frequency according to control and simultaneously receive radio frequency signals of the first frequency and the second frequency; a second ultra-short wave communication link, connected to a digital signal processing module, used to transmit radio frequency signals at the first frequency or the second frequency according to control and simultaneously receive radio frequency signals of the first frequency and the second frequency; a digital signal processing module, used to obtain radio frequency signals received by the first ultra-short wave communication link and the second ultra-short wave communication link, and demodulate to obtain received voice or data; and according to the ground station information and the aircraft inertial navigation information, determine the optimal link for communication with the ground station, and control the link to transmit radio frequency signals at the first frequency, and the other link to transmit radio frequency signals at the second frequency.

[0034] The first ultrashort wave communication link has the same structure as the second ultrashort wave communication link, wherein the first ultrashort wave communication link includes a first antenna, a first receiving channel, and a first transmitting channel, wherein the first antenna is connected to the digital signal processing module through the first receiving channel and the first transmitting channel respectively, radiates a radio frequency signal of the first frequency or the second frequency through the first transmitting channel, and simultaneously receives radio frequency signals of the first frequency and the second frequency through the first receiving channel. The second ultrashort wave communication link includes a second antenna, a second receiving channel, and a second transmitting channel, wherein the second antenna is connected to the digital signal processing module through the second receiving channel and the second transmitting channel respectively, radiates a radio frequency signal of the first frequency or the second frequency through the second transmitting channel, and simultaneously receives radio frequency signals of the first frequency and the second frequency through the second receiving channel.

[0035] Furthermore, this embodiment also provides a specific implementation of the digital signal processing module, please continue to refer to Figure 1 , the digital signal processing module includes:

[0036] A digital channel receiving and processing module is connected to the first receiving channel and the second receiving channel, and is used to combine and receive the received four-way diversity receiving signals, and demodulate and output voice or data;

[0037] The optimal antenna calculation module determines the current position and attitude of the aircraft based on the preset ground station information and periodic inertial navigation data, and then determines the optimal antenna for communicating with the ground station; for example, the first antenna and the second antenna are respectively set on the back and the belly of the aircraft. When the aircraft is flying level, it can be calculated that the optimal antenna is the second antenna set on the belly.

[0038] The transmission parameter control and modulation module is connected to the first transmission channel and the second transmission channel, and is used to control the transmission channel corresponding to the optimal antenna to operate at the same frequency as the ground station, that is, the first frequency, and the transmission channel corresponding to the other antenna to operate at the second frequency, and modulate the signal to transmit voice or data.

[0039] In the system proposed in this embodiment, dual antennas are used to transmit dual frequencies simultaneously during airborne transmission. At the same time, based on the real-time flight position and attitude, the transmission frequencies of the corresponding transmission channels of the two antennas are adaptively allocated to improve the effective coverage of the transmission airspace; during airborne reception, digital channelization processing is performed without increasing the channel hardware resources. Each antenna can provide the ability to receive dual-frequency signals, ensuring reliable communication in multiple scenarios between air and ground and air and air. Two ultra-short wave antennas are used to radiate two-frequency RF signals at the same time, avoiding the problem of multipath signal phase cancellation at the receiving end caused by the same frequency transmission. When receiving, there is no need to increase the hardware resources of the receiving channel. A single receiving channel is used under each antenna to receive two different frequency RF signals at the same time. Digital channelization reception is performed in the digital domain, and four signals can be received simultaneously through two receiving channels of two antennas. Through dual-antenna dual-frequency transmission, dual-antenna multi-channel signals are received simultaneously, overcoming the problem of insufficient airspace range of single antenna transmission, expanding the airspace coverage of transmission, and ensuring the communication quality of both the sender and the receiver.

[0040] In one embodiment, the first antenna is connected to the first receiving channel and the first transmitting channel through the first transceiver switch, and the second antenna is connected to the second receiving channel and the second transmitting channel through the second transceiver switch; wherein, when the system detects that the transmission is enabled, the first transceiver switch and the second transceiver switch are switched to be connected to the transmitting channel, otherwise they are connected to the receiving channel.

[0041] In one embodiment, an analog-to-digital conversion unit is provided between the first receiving channel, the second receiving channel and the digital channel receiving and processing module; a digital-to-analog conversion unit is provided between the first transmitting channel, the second transmitting channel and the transmitting parameter control and modulation module.

[0042] In order to enable the received signal to receive the required RF signal, in this embodiment, the center frequency of the first receiving channel and the second receiving channel is the third frequency, wherein the third frequency = (first frequency + second frequency) / 2; |second frequency - first frequency| > transmission signal bandwidth; receiving filter bandwidth = (|second frequency - first frequency| + transmission signal bandwidth).

[0043] In actual applications, in air-to-air communication, both parties use dual-frequency dual antennas, and any antenna radiating any frequency can guarantee airspace coverage. However, the ultra-short wave ground station is single-antenna, single-frequency, and different from air-to-air communication. For communication with the ultra-short wave ground station, the position of the ground station is pre-loaded, the current flight position and flight attitude of the aircraft are obtained in real time, the optimal antenna for communication with the ground station is calculated, and the same frequency as the ground station is used for transmission on the optimal antenna, which can simultaneously ensure the communication reliability of air-to-ground and air-to-air multi-task scenarios.

[0044] In order to better understand the ultra-short wave communication system proposed in the present invention, this embodiment also provides a specific working process of the system:

[0045] Assume that the ground station operating frequency is planned to be F1, the airborne system operating frequencies are F1 and F2, and the transmission signal bandwidth is BW. During airborne transmission, the ultra-short wave functional link radiates different frequency signals through two antennas, F1 and F2, |F2-F1|>BW. During reception, each antenna is configured with a receiving channel at the back end, and the center frequency of the receiving channel works at F3, where F3 = (F1 + F2) / 2, and the receiving filter bandwidth = (|F2-F1| + BW), that is, a single receiving channel can receive two frequency signals of F1 and F2 at the same time. The two receiving channels of the two airborne antennas receive four signals at the same time, and finally perform digital channelization processing after analog-to-digital conversion, and combine and receive the four-way diversity reception signals, and finally demodulate and output the received voice or data. During transmission, the optimal transmitting antenna and corresponding transmitting channel for communicating with the ultra-short wave ground station are configured as the ground station operating frequency F1 and then transmitted, and the other antenna and channel work at F2. That is, without increasing the channel hardware resources, dual-antenna dual-frequency transmission overcomes the problem of insufficient airspace coverage of single-antenna transmission, expands the transmission communication airspace coverage range, and ensures the communication reliability of both the sender and the receiver.

[0046] Example 2

[0047] This embodiment proposes an airborne dual-frequency dual-antenna ultra-short wave communication method, which is applied to a dual-antenna airborne communication system, and can also be applied to the airborne dual-frequency dual-antenna ultra-short wave communication system proposed in Example 1, including: configuring the operating frequency of the airborne system to be a first frequency and a second frequency, wherein the first frequency is the operating frequency of the ground station; controlling the receiving channel of the dual antenna to operate at a third frequency, wherein the third frequency = (first frequency + second frequency) / 2; when the function transmission enable is invalid, receiving multiple signals at the same time and processing and demodulating them to obtain voice or data; when the function transmission enable is valid, determining the optimal antenna for communicating with the ground station, and controlling the transmission channel of the optimal antenna to operate at the first frequency, and the other antenna to operate at the second frequency, modulating the signal and transmitting voice or data.

[0048] Please refer to Figure 2 This embodiment also provides a transceiver process of an airborne dual-frequency dual-antenna ultra-short wave communication method. Assuming that the airborne system includes a first antenna and a second antenna, the specific transceiver process is as follows:

[0049] S1, configure the ultra-short wave operating frequencies to F1 and F2, and the ground station operating frequency to F1;

[0050] S2, control the two receiving channels to operate at frequency F3, where F3 = (F1 + F2) / 2;

[0051] S3, real-time monitoring function transmission enable whether it is valid, if so, enter S4, otherwise, enter S11;

[0052] S4, extracting the ground station position from the preset information;

[0053] S5, extracting the aircraft position, attitude, and flight heading from the aircraft inertial navigation information;

[0054] S6. Calculate the optimal antenna for communicating with the ground station;

[0055] S7, if the best antenna for communicating with the ground station is the first antenna, proceed to S8, otherwise proceed to S9;

[0056] S8, controlling the transmission channel frequency of the first antenna to be F1, and the transmission channel frequency of the second antenna to be F2;

[0057] S9, controlling the transmission channel frequency of the second antenna to be F1, and the transmission channel frequency of the first antenna to be F2;

[0058] S10, modulate the signal and transmit voice or data in dual frequency;

[0059] S11, two receiving channels simultaneously receive multiple signals;

[0060] S12, digital channelized reception processing, and merging of multi-channel reception;

[0061] S13, demodulate and output received voice or data;

[0062] S14, in idle state, enters S3.

[0063] The airborne dual-frequency dual-antenna ultra-short wave communication method proposed in the present invention does not require additional channel resources during reception, thereby improving the effective coverage range of the transmitting airspace. At the same time, it has an adaptive transmission strategy, and the ultra-short wave ground station does not need to be modified in any way, thereby ensuring high-reliability communication in air-to-air and air-to-ground multi-task scenarios.

[0064] In particular, according to an embodiment of the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, an embodiment of the present application includes a computer program product, which includes a computer program carried on a computer readable medium, and the computer program includes a program code for executing the method shown in the flowchart.

[0065] It should be noted that the computer-readable medium shown in the embodiment of the present application may be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium may be, for example, - but not limited to - an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a flash memory, an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present application, a computer-readable storage medium may be any tangible medium containing or storing a program, which may be used by an instruction execution system, device or device or used in combination with it. In the present application, a computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, wherein a computer-readable program code is carried. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Computer-readable signal media may also be any computer-readable medium other than computer-readable storage media, which may send, propagate, or transmit programs for use by or in conjunction with an instruction execution system, apparatus, or device. The program code contained on the computer-readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wired, etc., or any suitable combination of the above.

[0066] The flowchart and block diagram in the accompanying drawings illustrate the possible architecture, functions and operations of the system, method and computer program product according to various embodiments of the present application. Wherein, each box in the flowchart or block diagram can represent a module, a program segment, or a part of the code, and the above-mentioned module, program segment, or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram or flowchart, and the combination of boxes in the block diagram or flowchart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0067] The units involved in the embodiments described in this application may be implemented by software or hardware, and the units described may also be set in a processor. The names of these units do not, in some cases, constitute limitations on the units themselves.

[0068] As another aspect, the present application also provides a computer program product or a computer program, which includes a computer instruction stored in a computer-readable storage medium. A processor of a computer device reads the computer instruction from the computer-readable storage medium, and the processor executes the computer instruction, so that the computer device executes the airborne dual-frequency dual-antenna ultra-short wave communication method described in the above embodiment.

[0069] As another aspect, the present application also provides a computer-readable medium, which may be included in the electronic device described in the above embodiment; or may exist independently without being assembled into the electronic device. The above computer-readable medium carries one or more programs, and when the above one or more programs are executed by an electronic device, the electronic device implements the airborne dual-frequency dual-antenna ultra-short wave communication method described in the above embodiment.

[0070] It should be noted that, although several modules or units of the equipment for action execution are mentioned in the above detailed description, this division is not mandatory. In fact, according to the embodiments of the present application, the features and functions of two or more modules or units described above can be embodied in one module or unit. On the contrary, the features and functions of one module or unit described above can be further divided into being embodied by multiple modules or units.

[0071] Through the description of the above implementation methods, it is easy for those skilled in the art to understand that the example implementation methods described here can be implemented by software or by combining software with necessary hardware. Therefore, the technical solution according to the implementation methods of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network, and includes several instructions to enable a computing device (which can be a personal computer, a server, a touch terminal, or a network device, etc.) to execute the method according to the implementation methods of the present application.

[0072] For those skilled in the art, the specific meanings of the above terms in the present invention can be understood in specific situations; the drawings in the embodiments are used to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0073] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. An airborne dual-frequency dual-antenna ultra-short wave communication system, characterized in that: The airborne system operates at a first frequency and a second frequency, and the ground station is configured to operate at the first frequency, including: A first ultra-short wave communication link is connected to the digital signal processing module and is used to transmit signals at a first frequency or a second frequency according to control and to simultaneously receive radio frequency signals at the first frequency and the second frequency; A second ultra-short wave communication link is connected to the digital signal processing module and is used to transmit a radio frequency signal at a first frequency or a second frequency according to the control and to simultaneously receive radio frequency signals at the first frequency and the second frequency; The digital signal processing module is used to obtain the radio frequency signals received by the first ultra-short wave communication link and the second ultra-short wave communication link, and demodulate to obtain the received voice or data; and determine the optimal link for communicating with the ground station according to the ground station information and the aircraft inertial navigation information, and control the link to transmit the radio frequency signal at the first frequency, and the other link to transmit the radio frequency signal at the second frequency.

2. The airborne dual-frequency dual-antenna ultra-short wave communication system according to claim 1, characterized in that: The first ultra-short wave communication link includes a first antenna, a first receiving channel, and a first transmitting channel. The first antenna is connected to the digital signal processing module through the first receiving channel and the first transmitting channel respectively, radiates a radio frequency signal of a first frequency or a second frequency through the first transmitting channel, and simultaneously receives radio frequency signals of the first frequency and the second frequency through the first receiving channel.

3. The airborne dual-frequency dual-antenna ultra-short wave communication system according to claim 2, characterized in that: The second ultrashort wave communication link includes a second antenna, a second receiving channel, and a second transmitting channel. The second antenna is connected to the digital signal processing module through the second receiving channel and the second transmitting channel respectively, radiates the radio frequency signal of the first frequency or the second frequency through the second transmitting channel, and simultaneously receives the radio frequency signals of the first frequency and the second frequency through the second receiving channel.

4. The airborne dual-frequency dual-antenna ultra-short wave communication system according to claim 3, characterized in that: The digital signal processing module comprises: A digital channel receiving and processing module is connected to the first receiving channel and the second receiving channel, and is used to combine and receive the received four-way diversity receiving signals, and demodulate and output voice or data; The optimal antenna calculation module determines the current position and attitude of the aircraft based on the preset ground station information and periodic inertial navigation data, and then determines the optimal antenna for communicating with the ground station; The transmission parameter control and modulation module is connected to the first transmission channel and the second transmission channel, and is used to control the transmission channel corresponding to the optimal antenna to operate at the same frequency as the ground station, that is, the first frequency, and the transmission channel corresponding to the other antenna to operate at the second frequency, and modulate the signal to transmit voice or data.

5. The airborne dual-frequency dual-antenna ultra-short wave communication system according to claim 3, characterized in that: The first antenna is connected to the first receiving channel and the first transmitting channel through the first transceiver switch, and the second antenna is connected to the second receiving channel and the second transmitting channel through the second transceiver switch; wherein, when the system detects that the transmission is enabled, the first transceiver switch and the second transceiver switch are switched to be connected to the transmitting channel, otherwise they are connected to the receiving channel.

6. The airborne dual-frequency dual-antenna ultra-short wave communication system according to claim 3, characterized in that: An analog-to-digital conversion unit is provided between the first receiving channel, the second receiving channel and the digital channel receiving and processing module; a digital-to-analog conversion unit is provided between the first transmitting channel, the second transmitting channel and the transmitting parameter control and modulation module.

7. The airborne dual-frequency dual-antenna ultra-short wave communication system according to claim 3, characterized in that: The center frequency of the first receiving channel and the second receiving channel is the third frequency, wherein the third frequency = (first frequency + second frequency) / 2; |second frequency - first frequency| > transmission signal bandwidth; reception filter bandwidth = (|second frequency - first frequency| + transmission signal bandwidth).

8. An airborne dual-frequency dual-antenna ultra-short wave communication method, characterized in that: Applied to dual-antenna airborne communication systems, including: Configuring the operating frequency of the airborne system to be a first frequency and a second frequency, wherein the first frequency is the operating frequency of the ground station; Controlling the receiving channel of the dual antenna to operate at a third frequency, wherein the third frequency = (first frequency + second frequency) / 2; When the function transmission enable is invalid, multiple signals are received at the same time and processed and demodulated to obtain voice or data; When the function transmission enable is valid, the optimal antenna for communicating with the ground station is determined, and the transmission channel of the optimal antenna is controlled to operate at a first frequency, and the other antenna operates at a second frequency to modulate the signal and transmit voice or data.

9. The airborne dual-frequency dual-antenna ultra-short wave communication method according to claim 8, characterized in that: The determining of the optimal antenna for communicating with the ground station specifically includes: Determine the location of the ground station based on the preset information of the airborne system; Extract aircraft position, attitude, and flight heading based on aircraft periodic inertial navigation information; Calculate the optimal antenna for communicating with a ground station.

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