An airborne dual-frequency dual-antenna ultra-short wave communication system and method

Abstract

The application provides an airborne dual-frequency dual-antenna ultra-short wave communication system, wherein the airborne system works at a first frequency and a second frequency, a ground station is configured to work at the first frequency, and the system comprises: a first ultra-short wave communication link and a second short wave communication link, which are controlled to transmit signals at the first frequency or the second frequency and simultaneously receive radio frequency signals at the first frequency and the second frequency; a digital signal processing module, which is used to acquire the radio frequency signals received by the ultra-short wave communication link and demodulate received voice or data; and according to ground station information and aircraft inertial navigation information, the optimal link for communication with the ground station is determined, and the link is controlled to transmit radio frequency signals at the first frequency, and the other link is controlled to transmit radio frequency signals at the second frequency. The application does not need to additionally increase channel resources when receiving, improves the effective coverage range of the transmission airspace, simultaneously has an adaptive transmission strategy, the ground station does not need to be modified, and high reliability communication in air-to-air and air-to-ground multi-task scenarios is ensured.

Description

TECHNICAL FIELD

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

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

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

[0004] In order to overcome the problem of insufficient spatial coverage of single-antenna transmission, an airborne dual-frequency dual-antenna ultra-short wave communication system and method are proposed. Based on the real-time flight position and flight attitude, the transmission strategy is adaptively adjusted without increasing the hardware resources of the channel, thereby solving the problem of insufficient spatial coverage of airborne platform ultra-short wave single-antenna transmission, which leads to the problem that the communication distance in some space does not meet the requirements.

[0005] The first aspect of the present application proposes an airborne dual-frequency dual-antenna ultra-short wave communication system. The airborne system works at a first frequency and a second frequency, and the ground station is configured to work at the first frequency, comprising:

[0006] The first ultra-short wave communication link is connected with the digital signal processing module, and is used for transmitting signals at the first frequency or the second frequency and simultaneously receiving radio frequency signals at the first frequency and the second frequency according to control;

[0007] The second ultra-short wave communication link is connected with the digital signal processing module, and is used for transmitting radio frequency signals at the first frequency or the second frequency and simultaneously receiving radio frequency signals at the first frequency and the second frequency according to control;

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

[0009] As a preferred solution, the first ultra-short wave communication link comprises a first antenna, a first receiving channel and a first transmitting channel, the first antenna is connected with the digital signal processing module through the first receiving channel and the first transmitting channel respectively, and radiates radio frequency signals at the first frequency or the second frequency through the first transmitting channel and simultaneously receives radio frequency signals at the first frequency and the second frequency through the first receiving channel.

[0010] As a preferred solution, the second ultra-short wave communication link comprises a second antenna, a second receiving channel and a second transmitting channel, the second antenna is connected with the digital signal processing module through the second receiving channel and the second transmitting channel respectively, and radiates radio frequency signals at the first frequency or the second frequency through the second transmitting channel and simultaneously receives radio frequency signals at the first frequency and the second frequency through the second receiving channel.

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

[0012] The digital channel receiving and processing module is connected with the first receiving channel and the second receiving channel, and is used for receiving and processing four-way diversity receiving signals, demodulating and outputting voice or data;

[0013] The optimal antenna calculation module is used for determining the current position and attitude of the aircraft according to preset ground station information and periodic inertial navigation data, and further determining an optimal antenna for communication with the ground station.

[0014] The transmitting parameter control and modulation module is connected with the first transmitting channel and the second transmitting channel, and is used for controlling the transmitting channel corresponding to the optimal antenna to work at the same frequency as the ground station, i.e. the first frequency, and controlling the transmitting channel corresponding to the other antenna to work at the second frequency, and modulating and transmitting signals to voice or data.

[0015] As a preferred solution, the first antenna is connected with the first receiving channel and the first transmitting channel through a first transceiving switch, and the second antenna is connected with the second receiving channel and the second transmitting channel through a second transceiving switch; wherein, when the system monitors the transmitting enable, the first transceiving switch and the second transceiving switch are switched on the transmitting channel, and vice versa.

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

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

[0018] The second aspect of the application provides an airborne double-frequency double-antenna ultra-short wave communication method, which is applied to a double-antenna airborne communication system and comprises the following steps:

[0019] The working frequencies of the airborne system are configured as a first frequency and a second frequency, wherein the first frequency is the working frequency of a ground station.

[0020] The receiving channels of the double antennas are controlled to work at a third frequency, wherein the third frequency=(the first frequency+the second frequency) / 2.

[0021] When the transmitting enable is invalid, multiple signals are received and processed to obtain voice or data.

[0022] When the transmitting enable is valid, the optimal antenna for communication with the ground station is determined, the transmitting channel of the optimal antenna is controlled to work at the first frequency, the transmitting channel of the other antenna is controlled to work at the second frequency, a signal is modulated, and voice or data is transmitted.

[0023] As a preferred solution, the determination of the optimal antenna for communication with the ground station comprises the following steps:

[0024] The position of the ground station is determined according to the preset information of the airborne system.

[0025] The position, attitude and flight direction of the airplane are extracted according to the periodic inertial navigation information of the airplane.

[0026] The optimal antenna for communication with the ground station is calculated.

[0027] Compared with the prior art, the beneficial effects of the above technical scheme are that: the present application does not need to additionally increase channel resources when receiving, improves the effective coverage range of the transmission space, has a self-adaptive transmission strategy, and does not need to make any modification to the ultra-short wave ground station, thereby ensuring high reliability communication in air-to-air and air-to-ground multi-task scenarios BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 An airborne dual-frequency dual-antenna ultra-short wave communication system according to the present application is shown in the figure.

[0029] Figure 2 A flow chart of an airborne dual-frequency dual-antenna ultra-short wave communication method according to the present application is shown in the figure. DETAILED DESCRIPTION

[0030] Embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference signs represent the same or similar modules or modules with the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application. On the contrary, the embodiments of the present application include all changes, modifications and equivalents falling within the spirit and scope of the appended claims.

[0031] Embodiment 1

[0032] In view of the deficiencies of the existing airborne ultra-short wave dual-antenna communication system, the present application provides an airborne dual-frequency dual-antenna ultra-short wave communication system with a larger transmission space coverage range and more reliable communication quality, without increasing additional channel hardware resources, and with high resource utilization.

[0033] Please refer to Figure 1 The airborne dual-frequency dual-antenna ultra-short wave communication system provides two working frequencies of first frequency and 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 with a digital signal processing module, for transmitting signals at the first frequency or the second frequency according to control and simultaneously receiving radio frequency signals of the first frequency and the second frequency; a second ultra-short wave communication link connected with the digital signal processing module, for transmitting radio frequency signals at the first frequency or the second frequency according to control and simultaneously receiving radio frequency signals of the first frequency and the second frequency; a digital signal processing module for obtaining radio frequency signals received by the first ultra-short wave communication link and the second ultra-short wave communication link, and demodulating to obtain received voice or data; and determining the optimal link for communication with the ground station according to the ground station information and the aircraft inertial navigation information, and controlling 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 ultra-short wave communication link and the second ultra-short wave communication link are identical, and the first ultra-short wave communication link comprises a first antenna, a first receiving channel and a first transmitting channel. The first antenna is connected with the digital signal processing module through the first receiving channel and the first transmitting channel respectively. The first antenna radiates radio frequency signals 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 ultra-short wave communication link comprises a second antenna, a second receiving channel and a second transmitting channel. The second antenna is connected with the digital signal processing module through the second receiving channel and the second transmitting channel respectively. The second antenna radiates radio frequency signals 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] Further, the embodiment also provides a specific implementation of the digital signal processing module, please continue to refer to Figure 1 The digital signal processing module comprises:

[0036] A digital channel receiving and processing module is connected with the first receiving channel and the second receiving channel, and is used for receiving and processing four-way diversity receiving signals.

[0037] An optimal antenna calculation module is used for determining the current position and attitude of the airplane according to the preset ground station information and the periodic inertial navigation data, and then determining the optimal antenna for communication with the ground station. For example, the first antenna and the second antenna are arranged on the back and the belly of the airplane respectively. When the airplane is in level flight, the optimal antenna is the second antenna arranged on the belly.

[0038] A transmitting parameter control and modulation module is connected with the first transmitting channel and the second transmitting channel, and is used for controlling the transmitting channel corresponding to the optimal antenna to work at the same frequency as the ground station, i.e. the first frequency, and controlling the transmitting channel corresponding to the other antenna to work at the second frequency, and modulating and transmitting the signals.

[0039] In the system provided in the embodiment, two antennas are used to simultaneously transmit two frequencies when transmitting on board, and the transmission frequencies of the two antennas are adaptively allocated based on the real-time flight position and attitude, so as to improve the effective coverage range of the transmission airspace; when receiving on board, digital channelization processing is used without increasing the channel hardware resources, and each antenna can provide the capability of receiving double-frequency signals, thereby ensuring reliable communication in multiple scenarios such as air-to-ground and air-to-air. Two ultra-short wave antennas are used to simultaneously radiate two frequency radio signals, which avoids the problem of phase cancellation of multipath signals at the receiving end caused by the same frequency transmission. When receiving, no additional receiving channel hardware resources are needed, and each antenna uses a single receiving channel to simultaneously receive two different frequency radio signals. In the digital domain, digital channelization reception is performed, so that two antennas can simultaneously receive four signals through two receiving channels. Through double-antenna double-frequency transmission and simultaneous reception of multiple signals through two antennas, the problem of insufficient transmission airspace range of a single antenna is overcome, the transmission airspace coverage range is expanded, and the communication quality of the transmitting and receiving parties is ensured.

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

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

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

[0043] In actual application, when communicating with an aircraft, both parties use double-frequency double-antenna, and any antenna radiating any frequency can ensure the airspace coverage range. However, the ultra-short wave ground station uses a single antenna and a single frequency, which is different from air-to-air communication. For communication with the ultra-short wave ground station, the position of the ground station is preloaded, 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 on the optimal antenna for transmission, which can ensure the communication reliability in multiple scenarios such as air-to-ground and air-to-air.

[0044] In order to better understand the ultra-short wave communication system provided in the embodiment, the specific working process of the system is also given in the embodiment:

[0045] Suppose the ground station operating frequency is F1, the airborne system operating frequency is F1 and F2, and the transmission signal bandwidth is BW. When transmitting, the VHF functional link radiates signals of different frequencies, F1 and F2, through two antennas, |F2-F1|>BW. When receiving, each antenna is configured with a receiving channel, and the center frequency of the receiving channel operates at F3, where F3=(F1+F2) / 2, and the receiving filter bandwidth=|F2-F1|+BW. That is, a single receiving channel can simultaneously receive signals of two frequencies, F1 and F2. The two receiving channels of the two antennas on the airborne system simultaneously receive four signals. After analog-to-digital conversion, digital channelization processing is performed, and the four signals received by diversity are combined and received. Finally, the voice or data is demodulated and output. When transmitting, the optimal transmitting antenna and the corresponding transmitting channel for communication with the VHF ground station are configured to operate at the ground station operating frequency F1, and the other antenna and channel operate at F2. That is, without increasing the hardware resources of the channel, the problem of insufficient spatial coverage of single antenna transmission is overcome by dual antenna dual frequency transmission, the spatial coverage range of transmission communication is expanded, and the communication reliability of the transmitter and receiver is ensured.

[0046] Embodiment 2

[0047] The embodiment provides an airborne dual-frequency dual-antenna VHF communication method, which is applied to a dual-antenna airborne communication system and can also be applied to the airborne dual-frequency dual-antenna VHF communication system provided in Embodiment 1. The method comprises the following steps: configuring the operating frequency of the airborne system as a first frequency and a second frequency, wherein the first frequency is the operating frequency of the ground station; controlling the receiving channels of the dual antennas to operate at a third frequency, wherein the third frequency=(first frequency+second frequency) / 2; when the functional transmission enablement is disabled, simultaneously receiving multiple signals and obtaining voice or data through processing and demodulation; when the functional transmission enablement is enabled, determining the optimal antenna for communication with the ground station, controlling the transmitting channel of the optimal antenna to operate at the first frequency and the transmitting channel of the other antenna to operate at the second frequency, and modulating and transmitting voice or data.

[0048] For reference Figure 2 The embodiment also provides a transmission and reception process of the airborne dual-frequency dual-antenna VHF communication method. Suppose the airborne system comprises a first antenna and a second antenna. The specific transmission and reception process is as follows:

[0049] S1, configuring the VHF operating frequency as F1 and F2, and the ground station operating frequency as F1;

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

[0051] S3, monitoring whether the functional transmission enablement is valid in real time. If yes, the process proceeds to S4, otherwise, the process proceeds to S11;

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

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

[0054] S6, calculating the optimal antenna for communication with the ground station;

[0055] S7, if the optimal antenna for communication with the ground station is the first antenna, entering S8, otherwise entering S9;

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

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

[0058] S10, modulating the signal and transmitting voice or data in dual frequency;

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

[0060] S12, digital channelization receiving processing and combining multiple receiving;

[0061] S13, demodulating and outputting the received voice or data;

[0062] S14, in an idle state, entering S3.

[0063] The airborne dual-frequency dual-antenna ultra-short wave communication method provided by the application does not need to additionally increase channel resources in receiving, improves the effective coverage range of the transmission space, has a self-adaptive transmission strategy, and does not need to make any modification to the ultra-short wave ground station, thereby ensuring high reliability communication in air-to-air and air-to-ground multi-task scenarios.

[0064] In particular, the processes described above with reference to the flowcharts can be implemented as a computer software program according to embodiments of the present application. For example, embodiments of the present application include a computer program product comprising a computer program carried on a computer readable medium, the computer program comprising program code for executing the methods shown in the flowcharts.

[0065] It should be noted that the computer-readable medium in the embodiments of the present application can be a computer-readable signal medium or a computer-readable storage medium or any combination thereof. The computer-readable storage medium may, for example, but is not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or apparatus, or any combination thereof. More specific examples of the computer-readable storage medium can include, but are not limited to, an electrical connection having one or more wires, a portable computer diskette, 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 (Compact Disc Read-Only Memory, CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In the present application, the computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, device or apparatus. In the present application, the computer-readable signal medium can include a data signal carrying computer-readable program code in a baseband or as a part of a carrier wave. Such a propagated data signal can take on various forms, including but not limited to an electromagnetic signal, an optical signal, or any suitable combination thereof. The computer-readable signal medium can also be any computer-readable medium other than the computer-readable storage medium that can send, propagate or transmit a program for use by or in connection with an instruction execution system, device or apparatus. The program code contained on the computer-readable medium can be transmitted using any suitable medium, including but not limited to wireless, wired, or the like, or any suitable combination thereof.

[0066] The flowcharts and block diagrams in the drawings illustrate the possible implementation architectures, functions and operations of the systems, methods and computer program products according to various embodiments of the present application. In the flowcharts or block diagrams, each block can represent a module, a program segment or a part of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions noted in the blocks can occur in different orders than that shown in the drawings. For example, two blocks that are shown in succession can actually be executed substantially in parallel, and they can also be executed in reverse order, depending on the involved functions. It should also be noted that each block in the block diagrams or flowcharts, and the combination of blocks in the block diagrams or flowcharts, can be implemented by a dedicated hardware-based system that performs the specified functions or operations, or can be implemented by a combination of special-purpose hardware and computer instructions.

[0067] The units described in the embodiments of the present application can be implemented in the form of software, or can be implemented in the form of hardware, and the described units can also be arranged in a processor. In some cases, the names of the units do not constitute a limitation on the units themselves.

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

[0069] As another aspect, the present application also provides a computer readable medium, which can be included in the electronic device described in the above embodiments, or can exist separately without being assembled into the electronic device. The computer readable medium carries one or more programs, which, when executed by the electronic device, enable the electronic device to implement the airborne dual-frequency dual-antenna ultra-short wave communication method described in the above embodiments.

[0070] It should be noted that, although several modules or units of the device for action execution are mentioned in the above detailed description, such 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. Conversely, the features and functions of one module or unit described above can be further divided into several modules or units.

[0071] From the above description of the embodiments, those skilled in the art can easily understand that the example embodiments described herein can be implemented by software, or by software in combination with necessary hardware. Therefore, the technical solutions according to the embodiments 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, U disk, mobile hard disk, etc.) or network, and includes several instructions to enable a computing device (which can be a personal computer, server, touch terminal, or network device, etc.) to perform the methods according to the embodiments of the present application.

[0072] The above terms can be understood in the specific meaning in the present application by the person of ordinary skill in the art according to the specific circumstances; the drawings in the embodiments are used to clearly and completely describe the technical solutions in the embodiments of the present application, and obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application 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 limiting the present application, and the person of ordinary skill in the art can make changes, modifications, replacements and variations to 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 works at a first frequency and a second frequency, and the ground station is configured to work at the first frequency, comprising: A first ultrashort wave communication link connected with the digital signal processing module, for transmitting signals at the first frequency or the second frequency and simultaneously receiving radio frequency signals at the first frequency and the second frequency according to control; the first ultrashort wave communication link comprises a first antenna; A second ultrashort wave communication link connected with the digital signal processing module, for transmitting radio frequency signals at the first frequency or the second frequency and simultaneously receiving radio frequency signals at the first frequency and the second frequency according to control; the second ultrashort wave communication link comprises a second antenna; The digital signal processing module is used for obtaining radio frequency signals received by the first ultrashort wave communication link and the second ultrashort wave communication link, and demodulating to obtain received voice or data; and determining the optimal ultrashort wave communication link for communication with the ground station according to ground station information and aircraft inertial navigation information, and controlling the link to transmit radio frequency signals at the first frequency and the other link to transmit radio frequency signals at the second frequency.

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

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

4. The airborne dual-frequency dual-antenna ultrashort wave communication system according to claim 3, characterized in that, The digital signal processing module comprises: A digitized channel receiving and processing module connected with the first receiving channel and the second receiving channel, for combining and receiving four-way diversity receiving signals, demodulating and outputting voice or data; An optimal antenna calculation module, for determining the current position and attitude of the aircraft according to preset ground station information and periodic inertial navigation data, and further determining the optimal antenna for communication with the ground station; A transmitting parameter control and modulation module connected with the first transmitting channel and the second transmitting channel, for controlling the transmitting channel corresponding to the optimal antenna to work at the same frequency as the ground station, i.e. the first frequency, and the transmitting channel corresponding to the other antenna to work at the second frequency, and modulating and transmitting voice or data.

5. The airborne dual-frequency dual-antenna ultrashort wave communication system according to claim 3, characterized in that, The first antenna is connected with the first receiving channel and the first transmitting channel through a first transceiving switch, and the second antenna is connected with the second receiving channel and the second transmitting channel through a second transceiving switch; wherein, when the system monitors that the transmission is enabled, the first transceiving switch and the second transceiving switch are switched to be connected with the transmitting channels, and vice versa.

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

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

8. An airborne dual-frequency dual-antenna ultra-short wave communication method, characterized in that, The airborne dual-frequency dual-antenna ultra-short wave communication system of any one of claims 1-7 comprises: The airborne system is configured to operate at a first frequency and a second frequency, wherein the first frequency is the operating frequency of the ground station; The receiving channels of the dual-antenna are controlled to operate at a third frequency, wherein the third frequency=(the first frequency+the second frequency) / 2; When the transmission enablement is invalid, multiple signals are simultaneously received, processed and demodulated to obtain voice or data; When the transmission enablement is valid, the optimal antenna for communication with the ground station is determined, and the transmission channel of the optimal antenna is controlled to operate at the first frequency, and the other antenna is controlled to operate at the second frequency, the signal is modulated, and voice or data is transmitted.

9. The airborne dual-frequency dual-antenna ultrashort wave communication method according to claim 8, characterized in that, The determination of the optimal antenna for communication with the ground station specifically comprises: The position of the ground station is determined according to the preset information of the airborne system; The position, attitude and flight direction of the airplane are extracted according to the periodic inertial navigation information of the airplane; The optimal antenna for communication with the ground station is calculated.

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