A dual-link based airborne shortwave communication system and method

Abstract

The application discloses a kind of based on dual-link airborne short wave communication system and method, the system includes first airborne short wave link, second airborne short wave link and airborne avionics system, wherein first airborne short wave link independently completes short wave transceiving communication function, second airborne short wave link independently completes short wave transceiving communication function, airborne avionics system is connected with first airborne short wave link and second airborne short wave link respectively by bus, for the control and digital signal transmission of first airborne short wave link and second airborne short wave link, and for the frequency selection, digital signal of first airborne short wave link and second airborne short wave link downlink is combined function.The application makes up the direction blind area of airborne short wave antenna, improves the communication effect on the communication distance needing to be highlighted to be guaranteed, realizes the cooperation diversity of short wave two-way link frequency diversity and space diversity combination, improves the communication effect of airborne short wave communication system.

Description

Technical Field

[0001] This invention relates to the field of airborne shortwave communication technology, and in particular to an airborne shortwave communication system and method based on dual links. Background Technology

[0002] Shortwave communication refers to radio communication using electromagnetic waves with wavelengths between 100 meters and 10 meters and frequencies ranging from 3 MHz to 30 MHz. It primarily relies on ionospheric reflection for propagation. Airborne shortwave communication equipment refers to shortwave communication devices used for communication on aircraft.

[0003] Currently, airborne shortwave communication systems typically employ a single-link architecture, meaning they consist of only one shortwave antenna and one shortwave radio. This type of airborne shortwave communication system architecture suffers from problems such as blind spots in the radiation direction and a single downlink transmission frequency at the airborne end. A few airborne shortwave communication systems use a dual-antenna, single-radio airborne shortwave communication system architecture, which is equipped with two airborne shortwave antennas of identical performance and size, along with a single shortwave radio. This type of airborne shortwave communication system architecture can compensate for some of the shortwave antenna blind spots and improve the airborne shortwave reception communication effect, but during transmission, it can still only transmit through a single antenna at a single frequency, and the antenna gain is the same across all frequency bands, so it does not improve the downlink communication effect.

[0004] Therefore, there is an urgent need to invent a dual-link airborne shortwave communication system to solve the problems of poor shortwave transmission and reception caused by shortwave antenna blind spots and poor airborne shortwave downlink communication caused by frequency selection deviation, thereby improving the communication capability of the airborne shortwave communication system. Summary of the Invention

[0005] The purpose of this invention is to provide an airborne shortwave communication system and method based on dual links with wide communication coverage and no communication blind spots, so as to optimize communication effect and enhance communication capability.

[0006] The technical solution to achieve the purpose of this invention is: an airborne shortwave communication system based on dual links, including a first airborne shortwave link, a second airborne shortwave link, and an airborne avionics system;

[0007] The first airborne shortwave link includes a first airborne shortwave antenna and a first airborne shortwave radio, wherein the first airborne shortwave antenna is connected to the first airborne shortwave radio via a feeder, and is used for the first airborne shortwave link to independently complete the shortwave transceiver communication function.

[0008] The second airborne shortwave link includes a second airborne shortwave antenna and a second airborne shortwave radio, wherein the second airborne shortwave antenna is connected to the second airborne shortwave radio via a feeder, and is used for the second airborne shortwave link to independently complete shortwave transceiver communication functions;

[0009] The airborne avionics system is connected to the first airborne shortwave link and the second airborne shortwave link via a bus, and is used for the control and digital signal transmission of the first airborne shortwave link and the second airborne shortwave link, as well as for the frequency selection and digital signal diffusing and combining functions of the downlink of the first airborne shortwave link and the second airborne shortwave link.

[0010] Furthermore, the first airborne shortwave antenna and the second airborne shortwave antenna adopt differentiated designs. The first airborne shortwave antenna adopts a conventional design, while the second airborne shortwave antenna is customized to meet the usage requirements of the aircraft, and the antenna gain in the key frequency band range is optimized.

[0011] Furthermore, the first and second airborne shortwave antennas improve the depth of the antenna pattern through differentiated design and installation methods, thereby achieving blind spot compensation and ensuring that the radiation pattern of the airborne shortwave communication system has no blind spots.

[0012] Furthermore, the first airborne shortwave link and the second airborne shortwave link acquire signals of different frequencies in parallel, demodulate the signals in parallel, and send the digital signals demodulated at different frequencies to the airborne avionics system.

[0013] Furthermore, the airborne avionics system simultaneously controls the transmission and reception timing and service mode of the first and second airborne shortwave radios, and simultaneously monitors the operating status and link status of the first and second airborne shortwave radios.

[0014] Furthermore, the airborne avionics system performs diversity and processing on the digital signals received and demodulated by the first and second airborne shortwave links to achieve cooperative diversity that combines frequency diversity and spatial diversity.

[0015] Furthermore, the first airborne shortwave link and the second airborne shortwave link simultaneously transmit the same information at full power at different frequencies, and the communication station receives the information in parallel at different frequencies and performs aggregation and processing.

[0016] Furthermore, the airborne avionics system selects the optimal communication frequency based on the communication distance and communication time, and sends the communication frequency to the first airborne shortwave link and the second airborne shortwave link respectively, and the communication frequency interval sent to the first airborne shortwave link and the second airborne shortwave link must be no less than 2.5% of the currently used frequency.

[0017] A dual-link airborne shortwave communication method, based on the aforementioned dual-link airborne shortwave communication system, is described in detail below:

[0018] The airborne avionics system selects a first communication frequency and a second communication frequency based on communication distance and communication time, and controls the frequency interval between the first communication frequency and the second communication frequency to be no less than 2.5% of the currently used frequency;

[0019] The airborne avionics system transmits the digital information to be sent to the first airborne shortwave link and the second airborne shortwave link respectively, and controls the first airborne shortwave link to simultaneously transmit the same digital information at full power at the first communication frequency and the second airborne shortwave link to simultaneously transmit the same digital information at the second communication frequency; or,

[0020] The airborne avionics system controls the first airborne shortwave link and the second airborne shortwave link to acquire and demodulate signals of different frequencies in parallel to generate a first digital signal and a second digital signal.

[0021] The airborne avionics system performs diversity and combination processing on the first digital signal and the second digital signal to achieve cooperative diversity that combines frequency diversity and spatial diversity.

[0022] Furthermore, the method includes transmit state processing and receive state processing;

[0023] The launch status processing includes:

[0024] The airborne avionics system completes frequency planning, selects downlink transmission frequencies f1 and f2, and sends the frequencies f1 and f2, as well as the digital information to be transmitted, to the first airborne shortwave link and the second airborne shortwave link, respectively.

[0025] The first airborne shortwave link transmits the same digital information at full power simultaneously at frequency f1 and the second airborne shortwave link at frequency f2, so that the ground receiving station can receive and perform diversity and processing in parallel at different frequencies.

[0026] The receiving status processing includes:

[0027] The first airborne shortwave link and the second airborne shortwave link simultaneously receive and demodulate the signals sent by the ground transmitter on the uplink transmission frequency, generate a first digital signal and a second digital signal, and send the first digital signal and the second digital signal to the airborne avionics system;

[0028] The airborne avionics system performs cooperative diversity and spatial diversity combined processing on the first digital signal and the second digital signal to improve the uplink signal reception gain.

[0029] Compared with the prior art, the present invention has the following significant advantages: (1) Dual antenna differentiated design, that is, two independent shortwave antennas are installed on the aircraft. One of them adopts a conventional design, that is, the antenna gain is not significantly differentiated in the shortwave band; the other shortwave antenna is customized for the use requirements, and the antenna gain in the key frequency band is optimized. The two antennas complement each other, eliminating the radiation direction blind zone of the single-link airborne shortwave communication system and expanding the communication coverage. (2) Dual-link different frequency concurrent technology is adopted, that is, the two radios can use different communication frequencies to send the same content at the same time on their respective connected airborne shortwave antennas, which improves the downlink communication effect. (3) Dual-link multi-frequency diversity merging technology, that is, when receiving, the two radios simultaneously receive and demodulate multi-frequency signals through two airborne shortwave antennas, and perform cooperative diversity merging of digital signals by combining frequency diversity and spatial diversity, which improves the uplink communication effect and enhances the communication capability of the airborne shortwave communication system. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of an airborne shortwave communication system based on dual links according to the present invention.

[0031] Figure 2 This is a schematic diagram of the principle of the airborne shortwave communication system of the present invention in the transmission state.

[0032] Figure 3 This is a schematic diagram of the principle of the airborne shortwave communication system of the present invention in the receiving state. Detailed Implementation

[0033] This invention provides an airborne shortwave communication system based on dual links, characterized in that it includes a first airborne shortwave link 1, a second airborne shortwave link 2, and an airborne avionics system 3;

[0034] The first airborne shortwave link 1 includes a first airborne shortwave antenna 4 and a first airborne shortwave radio 6, wherein the first airborne shortwave antenna 4 is connected to the first airborne shortwave radio 6 via a feeder, and is used for the first airborne shortwave link 1 to independently complete the shortwave transceiver communication function.

[0035] The second airborne shortwave link 2 includes a second airborne shortwave antenna 5 and a second airborne shortwave radio 7, wherein the second airborne shortwave antenna 5 is connected to the second airborne shortwave radio 6 via a feeder, and is used for the second airborne shortwave link 2 to independently complete the shortwave transceiver communication function;

[0036] The airborne avionics system 3 is connected to the first airborne shortwave link 1 and the second airborne shortwave link 2 via a bus, and is used for the control and digital signal transmission of the first airborne shortwave link 1 and the second airborne shortwave link 2, as well as for the frequency selection and digital signal diffusing and combining functions of the downlink of the first airborne shortwave link 1 and the second airborne shortwave link 2.

[0037] As a specific example, the first airborne shortwave antenna 4 and the second airborne shortwave antenna 5 adopt differentiated designs. The first airborne shortwave antenna 4 adopts a conventional design, while the second airborne shortwave antenna 5 is customized to meet the usage requirements of the aircraft, and the antenna gain in the key frequency band range is optimized.

[0038] As a specific example, the first airborne shortwave antenna 4 and the second airborne shortwave antenna 5 improve the depth of the radiation pattern of the two antennas through differentiated design and differentiated installation, thereby achieving the blind spot filling function and making the radiation pattern of the airborne shortwave communication system free of blind spots.

[0039] As a specific example, the first airborne shortwave link 1 and the second airborne shortwave link 2 acquire signals of different frequencies in parallel, demodulate the signals in parallel, and send the digital signals demodulated at different frequencies to the airborne avionics system 3.

[0040] As a specific example, the airborne avionics system 3 simultaneously controls the transmission and reception timing and service mode of the first airborne shortwave radio 6 and the second airborne shortwave radio 7, and simultaneously monitors the working status and link status of the first airborne shortwave radio 6 and the second airborne shortwave radio 7.

[0041] As a specific example, the airborne avionics system 3 performs diversity and processing on the digital signals received and demodulated by the first airborne shortwave link 1 and the second airborne shortwave link 2, thereby achieving cooperative diversity that combines frequency diversity and spatial diversity.

[0042] As a specific example, the first airborne shortwave link 1 and the second airborne shortwave link 2 simultaneously transmit the same information at full power at different frequencies, and the communication station receives the information in parallel at different frequencies and performs aggregation and processing.

[0043] As a specific example, the airborne avionics system 3 selects the current optimal communication frequency based on the communication distance and communication time, and sends the communication frequency to the first airborne shortwave link 1 and the second airborne shortwave link 2 respectively, and the communication frequency interval sent to the first airborne shortwave link 1 and the second airborne shortwave link 2 must be no less than 2.5% of the current frequency.

[0044] This invention also provides an airborne shortwave communication method based on dual links, characterized in that, based on the airborne shortwave communication system based on dual links according to any one of claims 1 to 8, the method is specifically as follows:

[0045] The airborne avionics system 3 selects a first communication frequency and a second communication frequency based on communication distance and communication time, and controls the frequency interval between the first communication frequency and the second communication frequency to be no less than 2.5% of the currently used frequency;

[0046] The airborne avionics system 3 transmits the digital information to be sent to the first airborne shortwave link 1 and the second airborne shortwave link 2 respectively, and controls the first airborne shortwave link 1 to transmit the same digital information simultaneously at full power at the first communication frequency and the second airborne shortwave link 2 to transmit the same digital information at the second communication frequency; or,

[0047] The airborne avionics system 3 controls the first airborne shortwave link 1 and the second airborne shortwave link 2 to acquire and demodulate signals of different frequencies in parallel to generate a first digital signal and a second digital signal.

[0048] The airborne avionics system 3 performs diversity and combination processing on the first digital signal and the second digital signal to achieve cooperative diversity that combines frequency diversity and spatial diversity.

[0049] As a specific example, the method includes transmit state processing and receive state processing;

[0050] The launch status processing includes:

[0051] The airborne avionics system 3 completes frequency planning, selects downlink transmission frequencies f1 and f2, and sends the frequencies f1 and f2 and the digital information to be transmitted to the first airborne shortwave link 1 and the second airborne shortwave link 2, respectively.

[0052] The first airborne shortwave link 1 transmits the same digital information at full power on frequency f1 and the second airborne shortwave link 2 on frequency f2, so that the ground receiving station can receive and perform diversity and processing in parallel at different frequencies.

[0053] The receiving status processing includes:

[0054] The first airborne shortwave link 1 and the second airborne shortwave link 2 simultaneously receive and demodulate the signals sent by the ground transmitter on the uplink transmission frequency, generate a first digital signal and a second digital signal, and send the first digital signal and the second digital signal to the airborne avionics system 3.

[0055] The airborne avionics system 3 performs cooperative diversity and spatial diversity combined processing on the first digital signal and the second digital signal to improve the uplink signal reception gain.

[0056] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0057] Example

[0058] like Figure 1 As shown, the present invention provides an airborne shortwave communication system based on dual links, comprising a first airborne shortwave link 1, a second airborne shortwave link 2, and an airborne avionics system 3;

[0059] The first airborne shortwave link 1 includes a first airborne shortwave antenna 4 and a first airborne shortwave radio 6, wherein the first airborne shortwave antenna 4 is connected to the first airborne shortwave radio 6 via a feeder, and is used for the first airborne shortwave link 1 to independently complete the shortwave transceiver communication function.

[0060] The second airborne shortwave link 2 includes a second airborne shortwave antenna 5 and a second airborne shortwave radio 7, wherein the second airborne shortwave antenna 5 is connected to the second airborne shortwave radio 6 via a feeder, and is used for the second airborne shortwave link 2 to independently complete the shortwave transceiver communication function;

[0061] The airborne avionics system 3 is connected to the first airborne shortwave link 1 and the second airborne shortwave link 2 via a bus, and is used for the control and digital signal transmission of the first airborne shortwave link 1 and the second airborne shortwave link 2, as well as for the frequency selection and digital signal diffusing and combining functions of the downlink of the first airborne shortwave link 1 and the second airborne shortwave link 2.

[0062] As a specific example, the first airborne shortwave antenna 4 and the second airborne shortwave antenna 5 adopt differentiated designs. The first airborne shortwave antenna 4 adopts a conventional design, while the second airborne shortwave antenna 5 is customized to meet the usage requirements of the aircraft, optimizing the antenna gain in key frequency bands to ensure communication performance at key communication distances.

[0063] As a specific example, the first airborne shortwave antenna 4 and the second airborne shortwave antenna 5 improve the depth of the radiation pattern of the two antennas through differentiated design and installation, thereby achieving the blind spot filling function and realizing the goal of eliminating blind spots in the radiation pattern of the airborne shortwave communication system.

[0064] As a specific example, the first airborne shortwave link 1 and the second airborne shortwave link 2 can acquire signals of different frequencies in parallel, demodulate the signals in parallel, and send the digital signals demodulated at different frequencies to the airborne avionics system 3.

[0065] As a specific example, the airborne avionics system 3 can simultaneously control the transmission and reception timing and service mode of the first airborne shortwave radio 6 and the second airborne shortwave radio 7, and can simultaneously monitor the working status and link status of the first airborne shortwave radio 6 and the second airborne shortwave radio 7.

[0066] As a specific example, the airborne avionics system 3 can perform diversity and processing on the demodulated digital signals received by the first airborne shortwave link 1 and the second airborne shortwave link 2, thereby achieving cooperative diversity that combines frequency diversity and spatial diversity, and improving the communication performance of the uplink.

[0067] As a specific example, the first airborne shortwave link 1 and the second airborne shortwave link 2 can simultaneously transmit the same information at full power at different frequencies. The communication station can receive the information in parallel at different frequencies and perform diversity and processing, thereby improving the communication effect of the shortwave downlink and reducing the communication impact caused by frequency selection.

[0068] As a specific example, the airborne avionics system 3 can select the current optimal communication frequency based on the communication distance and communication time, and send the communication frequency to the first airborne shortwave link 1 and the second airborne shortwave link 2 respectively. The communication frequency interval sent to the first airborne shortwave link 1 and the second airborne shortwave link 2 should not be too close, and the interval should reach 2.5% of the current frequency.

[0069] like Figure 2 As shown, when the airborne shortwave communication system is in transmission mode, the airborne avionics system 3 completes frequency planning, selects downlink transmission frequencies f1 and f2, and sends the frequencies and the digital information to be transmitted to the first airborne shortwave link 1 and the second airborne shortwave link 2 via the bus. The first airborne shortwave link 1 and the second airborne shortwave link 2 simultaneously transmit the same content on f1 and f2 respectively. Ground receiving station 1, ground receiving station 2... ground receiving station N can simultaneously receive and demodulate soft information on f1 and f2, and send the soft information to the ground processing center via the wide area network for cooperative diversity combining frequency diversity combining and spatial diversity combining, thereby improving the downlink signal reception gain.

[0070] like Figure 3 As shown, when the airborne shortwave communication system is in receiving mode, the ground processing center completes frequency planning and selects uplink transmission frequencies F1, F2...F... N The frequency and the digital information to be transmitted are sent to ground transmitter 1, ground transmitter 2... ground transmitter N via a wide area network. Ground transmitter 1, ground transmitter 2... ground transmitter N simultaneously transmit the same content according to the planned frequency. The first airborne shortwave link 1 and the second airborne shortwave link 2 simultaneously transmit at F1, F2... F... NThe system receives and demodulates the uplink signal to generate soft information, and then sends the soft information to the airborne avionics system 3 via the bus. It performs cooperative diversity combining frequency diversity and spatial combining to improve the uplink signal reception gain.

[0071] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An airborne shortwave communication system based on dual links, characterized in that, It includes a first airborne shortwave link (1), a second airborne shortwave link (2), and an airborne avionics system (3). The first airborne shortwave link (1) includes a first airborne shortwave antenna (4) and a first airborne shortwave radio (6), wherein the first airborne shortwave antenna (4) is connected to the first airborne shortwave radio (6) via a feeder, and is used for the first airborne shortwave link (1) to independently complete the shortwave transceiver communication function; The second airborne shortwave link (2) includes a second airborne shortwave antenna (5) and a second airborne shortwave radio (7), wherein the second airborne shortwave antenna (5) is connected to the second airborne shortwave radio (6) via a feeder, and is used for the second airborne shortwave link (2) to independently complete the shortwave transceiver communication function; The airborne avionics system (3) is connected to the first airborne shortwave link (1) and the second airborne shortwave link (2) via a bus, and is used for the control and digital signal transmission of the first airborne shortwave link (1) and the second airborne shortwave link (2), and for the frequency selection and digital signal diffusing functions of the downlink of the first airborne shortwave link (1) and the second airborne shortwave link (2).

2. The airborne shortwave communication system based on dual links according to claim 1, characterized in that, The first airborne shortwave antenna (4) and the second airborne shortwave antenna (5) adopt differentiated designs. The first airborne shortwave antenna (4) adopts a conventional design, while the second airborne shortwave antenna (5) is customized to meet the usage requirements of the aircraft and optimizes the antenna gain in the key frequency band range.

3. The airborne shortwave communication system based on dual links according to claim 2, characterized in that, The first airborne shortwave antenna (4) and the second airborne shortwave antenna (5) improve the depth of the radiation pattern of the two antennas through differentiated design and differentiated installation form, so as to achieve the blind spot filling function and make the radiation pattern of the airborne shortwave communication system without blind spots.

4. The airborne shortwave communication system based on dual links according to claim 1, characterized in that, The first airborne shortwave link (1) and the second airborne shortwave link (2) acquire signals of different frequencies in parallel, demodulate the signals in parallel, and send the digital signals demodulated at different frequencies to the airborne avionics system (3).

5. The airborne shortwave communication system based on dual links according to claim 1, characterized in that, The airborne avionics system (3) simultaneously controls the transmission and reception timing and service mode of the first airborne shortwave radio (6) and the second airborne shortwave radio (7), and simultaneously monitors the working status and link status of the first airborne shortwave radio (6) and the second airborne shortwave radio (7).

6. The airborne shortwave communication system based on dual links according to claim 1, characterized in that, The airborne avionics system (3) performs diversity and processing on the digital signals received and demodulated by the first airborne shortwave link (1) and the second airborne shortwave link (2), thereby achieving cooperative diversity that combines frequency diversity and spatial diversity.

7. The airborne shortwave communication system based on dual links according to claim 1, characterized in that, The first airborne shortwave link (1) and the second airborne shortwave link (2) simultaneously transmit the same information at full power at different frequencies, and the communication station receives the information in parallel at different frequencies and performs aggregation and processing.

8. The airborne shortwave communication system based on dual links according to claim 1, characterized in that, The airborne avionics system (3) selects the current best communication frequency based on the communication distance and communication time, and sends the communication frequency to the first airborne shortwave link (1) and the second airborne shortwave link (2) respectively. The communication frequency interval sent to the first airborne shortwave link (1) and the second airborne shortwave link (2) must be no less than 2.5% of the current frequency.

9. A dual-link airborne shortwave communication method, characterized in that, Based on the dual-link airborne shortwave communication system according to any one of claims 1 to 8, the method is as follows: The airborne avionics system (3) selects a first communication frequency and a second communication frequency based on communication distance and communication time, and controls the frequency interval between the first communication frequency and the second communication frequency to be no less than 2.5% of the current frequency. The airborne avionics system (3) transmits the digital information to be sent to the first airborne shortwave link (1) and the second airborne shortwave link (2) respectively, and controls the first airborne shortwave link (1) to transmit the same digital information at full power simultaneously at the first communication frequency and the second airborne shortwave link (2) to transmit the same digital information at the second communication frequency; or, The airborne avionics system (3) controls the first airborne shortwave link (1) and the second airborne shortwave link (2) to acquire and demodulate signals of different frequencies in parallel to generate a first digital signal and a second digital signal. The airborne avionics system (3) performs diversity and processing on the first digital signal and the second digital signal to achieve cooperative diversity that combines frequency diversity and spatial diversity.

10. The airborne shortwave communication method based on dual links according to claim 9, characterized in that, This method includes transmit state processing and receive state processing; The launch status processing includes: The airborne avionics system (3) completes frequency planning, selects downlink transmission frequencies f1 and f2, and sends the frequencies f1 and f2 and the digital information to be transmitted to the first airborne shortwave link (1) and the second airborne shortwave link (2), respectively. The first airborne shortwave link (1) transmits the same digital information at full power at frequency f1 and the second airborne shortwave link (2) at frequency f2, so that the ground receiving station can receive and perform diversity and processing in parallel at different frequencies; The receiving status processing includes: The first airborne shortwave link (1) and the second airborne shortwave link (2) simultaneously receive and demodulate the signals sent by the ground transmitter on the uplink transmission frequency, generate a first digital signal and a second digital signal, and send the first digital signal and the second digital signal to the airborne avionics system (3). The airborne avionics system (3) performs cooperative diversity and spatial diversity combined processing on the first digital signal and the second digital signal to improve the uplink signal reception gain.

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