An airborne multi-rate satellite signal transmitting device for fixed-wing aircraft

Abstract

The invention discloses an airborne multi-rate satellite signal transmitting device applied to a fixed-wing aircraft, belonging to the field of satellite communication technology, comprising a high-speed service access module, an interface management module, a control module, a channel coding module, an information collection module, a framing and mapping module, a shaping filter and interpolation module, a frequency point control and digital-to-analog conversion module, a Doppler frequency offset correction module and a Ku up-conversion module; the invention can realize the satellite signal transmission of the satellite communication equipment applied to the fixed-wing aircraft, and the remote domain return of the status information of the aircraft and the equipment.

Description

Technical Field

[0001] The invention relates to the field of satellite communication, in particular to a satellite signal transmitting device which can be used for a satellite communication system of a type of fixed-wing aircraft. Background Art

[0002] Satellite communication technology is one of the wireless communication technologies for realizing long-range transmission in today's information society. It has the advantages of long transmission distance and wide coverage, and has wide applications in both military and civilian fields. With the development of aviation technology, the installation of satellite communication equipment on fixed-wing aircraft to realize long-range communication has become another application field of satellite communication technology. The key and difficulty in the design of fixed-wing satellite communication systems is that the equipment needs to overcome the Doppler frequency deviation caused by the movement of the aircraft. At the same time, it is necessary to transmit the operating status information of the satellite communication equipment in the aircraft and the information of the carrier platform to the other end, thereby realizing the ground monitoring function of the operating status of the equipment in the aircraft. Summary of the invention

[0003] To solve the problems mentioned in the above background technology section, the present invention proposes an airborne multi-rate satellite signal transmitting device, which can realize satellite signal transmission of satellite communication equipment applied to fixed-wing aircraft, as well as long-range feedback of aircraft and equipment status information.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] An airborne multi-rate satellite signal transmitting device for fixed-wing aircraft, comprising a high-speed service access module 1, an interface management module 2, a control module 3, a channel coding module 4, an information collection module 5, a framing and mapping module 6, a shaping filter and interpolation module 7, a frequency point control and digital-to-analog conversion module 8, a Doppler frequency offset correction module 9 and a Ku up-conversion module 10;

[0006] The high-speed service access module 1 is used to receive video, image, voice and dispatch data transmitted by the aircraft platform service system and convert them into IP data;

[0007] The interface management module 2 is used to convert the IP data of the high-speed service access module 1 and the asynchronous data of the control module 3 into synchronous data;

[0008] The control module 3 is used to receive control information of the station control device, convert it into synchronization data, transmit the encoding method to the channel encoding module 4, transmit the modulation method to the framing and mapping module 6, and transmit the transmission frequency point information to the frequency point control and digital-to-analog conversion module 8.

[0009] The channel coding module 4 is used to complete LDPC coding, and can adaptively complete LDPC coding with code rates of 1 / 2 and 3 / 4;

[0010] The information collection module 5 is used to collect the aircraft platform information and satellite communication equipment information;

[0011] The framing and mapping module 6 is used to complete the framing and symbol mapping functions of the physical layer data;

[0012] The shaping filter and interpolation module 7 is used to perform shaping filter and interpolation processing on the mapped data and convert it into data that can be adapted to digital-to-analog conversion components;

[0013] The frequency control and digital-to-analog conversion module 8 is used to complete the frequency control and digital-to-analog conversion of the transmitted signal;

[0014] The Doppler frequency offset correction module 9 performs frequency offset pre-compensation of the transmitted signal by calculating the Doppler of the received signal;

[0015] The Ku up-conversion module 10 is used to convert the intermediate frequency signal after Doppler correction to the Ku frequency band;

[0016] After receiving the transmission data from the aircraft platform service system, the high-speed service access module converts it into IP data, and converts the converted IP data into synchronization data through the interface management module; the control module converts the monitoring data of the station control computer of the fixed-wing aircraft into synchronization data; after receiving the synchronization data from the interface management module and the control module, the channel coding module performs LDPC coding and sends the coded information to the framing and mapping module; the information collection module collects the aircraft platform information and the satellite communication equipment information and sends them to the framing and mapping module; then, the framing and mapping module collects the information from the information collection module and the channel coding module, and sends the information to the framing and mapping module. The data of the code module is framed at the physical layer, and the framed information enters the shaping filter and interpolation module; the shaping filter and interpolation module completes the shaping filter and interpolation processing of the mapped data, converts it into data that can be adapted to digital-to-analog conversion, and enters the frequency control and digital-to-analog conversion module; the Doppler frequency offset correction module completes the frequency offset pre-compensation of the transmitted signal by calculating the Doppler of the received signal, and sends the pre-compensated value to the frequency control and digital-to-analog conversion module; the frequency control and digital-to-analog conversion module completes the frequency control and digital-to-analog conversion of the transmitted signal, and the data after digital-to-analog conversion enters the Ku up-conversion module, and the frequency control data enters the control module.

[0017] Furthermore, the high-speed service access module 1 includes a video encoding module 11, a voice encoding module 12 and a synchronous data conversion module 13; the high-speed service access module receives video information transmitted by the aircraft platform service system and converts it into synchronous data through the video encoding module 11, and then converts it into IP data through the synchronous data conversion module 13; the voice information is converted into synchronous data through the voice encoding module 12, and then converted into IP data through the synchronous data conversion module 13.

[0018] Furthermore, the information collection module 5 includes an aircraft platform serial number information generation module 14 and a satellite communication equipment status information generation module 15; wherein, the aircraft platform serial number information generation module 14 uses a 4-bit WASH code to represent the serial number of the aircraft, and the satellite communication equipment status information generation module 15 uses a 16-bit WASH code to represent the status of the equipment, and after collection, a 20-bit WASH code represents the status information.

[0019] Furthermore, the framing and mapping module 4 includes a super-frame header generation module 16, a scattered pilot generation module 17, a framing module 18 and a symbol mapping module 19; wherein the super-frame header generation module uses a 64-bit PN code to generate a super-frame header of the data, and the scattered pilot generation module uses a 4096-bit PN code to generate. The framing module inserts the data generated by the super-frame header generation module and the scattered pilot generation module into the data output by the framing module, adds the super-frame header generated by the super-frame header generation module in front of the data, and then enters the symbol mapping module to complete the symbol mapping.

[0020] Furthermore, the shaping filter and interpolation module includes a shaping filter module 20, an interpolation filter module 21 and a parameter configuration module 22; wherein the shaping filter module is used to complete 8-fold shaping, and the shaping and quantized data is sent to the interpolation filter module; the interpolation filter module 21 is used to receive the data sent by the shaping filter module, and perform interpolation filtering on the waveform data. The interpolation filtering adopts a CIC filter, and at the same time outputs the shaping filter and interpolation module to the frequency control and digital-to-analog conversion block; the parameter configuration module 22 is used to receive the rate control signal of the control module, and control the interpolation multiple of the interpolation filter module through the rate control signal, and the interpolation multiple can be adjusted to 4 times, 8 times, 16 times, 32 times or 64 times respectively.

[0021] Further, the frequency point control and digital-to-analog conversion module includes an output frequency point counting and control module 23, a frequency conversion module 24, an intermediate frequency modulation module 25 and an intermediate frequency conversion module 26, wherein the output frequency point counting and control module is used to receive the output frequency control signal and the output level control signal sent by the control module, and the frequency compensation value sent by the Doppler frequency offset compensation module, send the frequency compensation value sent by the Doppler frequency offset compensation module to the frequency conversion module, send the output level control signal to the intermediate frequency modulation module, and send the output level control signal to the intermediate frequency conversion module;

[0022] The frequency conversion module is used to receive information from the Doppler frequency offset compensation module and the shaping filter and interpolation module 7, complete the Doppler pre-compensation, and output it to the intermediate frequency modulation module. The intermediate frequency modulation module multiplies and adds the data of the frequency conversion module with the sine signal and the cosine signal to generate a digital modulation signal. The frequency point of the digital modulation signal is variable, and the output power attenuation of the digital modulation signal is controlled according to the output level control signal. The modulated signal after power attenuation control is sent to the intermediate frequency conversion module. The intermediate frequency conversion module converts the baseband signal into an intermediate frequency signal and sends it to the Ku up-conversion module.

[0023] Furthermore, the Doppler frequency deviation compensation module includes a signal receiving module 27, a frequency deviation calculation module 28 and a digital up-conversion module 29, which are used to complete the calculation of the Doppler frequency deviation caused by the movement of the aircraft and compensate it to the transmitting end, wherein the signal receiving module completes the clock conversion of the received AD sampled data and converts it into high-power clock data, and the frequency deviation calculation module mainly uses high-power Fourier transform to complete the frequency domain transformation, obtains the frequency deviation value of the current signal through maximum value search, and inputs it into the digital up-conversion module, and the value output by the digital up-conversion is output to the frequency point control and digital-to-analog conversion module.

[0024] The present invention has the following advantages:

[0025] 1. The airborne multi-rate satellite signal transmitting device of the present invention can achieve an information rate of 25Mbps, three modulation modes of BPSK, QPSK, and 8PSK, and three coding rates of 1 / 2, 3 / 4, and 7 / 8, with a wide range of applications and excellent performance.

[0026] 2. The airborne multi-rate satellite signal transmitting device of the present invention can correct the Doppler frequency deviation caused by the movement of fixed-wing aircraft and has strong adaptability to different aircraft applications.

[0027] 3. The airborne multi-rate satellite signal transmitting device of the present invention can transmit the status information of the fixed-wing aircraft and the status information of the airborne satellite communication equipment back to the ground remotely, so that the ground staff can remotely understand the status of the aircraft.

[0028] 4. The airborne multi-rate satellite signal transmitting device of the present invention can support a variety of mode combinations, and when switching between modes, mode switching can be achieved without performing a reset operation, which is easy to use.

[0029] 5. The present invention is implemented on a programmable logic device and has the advantages of small hardware resource occupation, stable layout and wiring timing, and reliable and stable performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is the electrical schematic diagram of the airborne multi-rate satellite signal transmitting device.

[0031] Figure 2It is the electrical schematic diagram of the high-speed service access module.

[0032] Figure 3 This is the electrical schematic diagram of the information collection module.

[0033] Figure 4 It is the electrical schematic diagram of the framing and mapping module.

[0034] Figure 5 This is the electrical schematic diagram of the shaping filter and interpolation module.

[0035] Figure 6 It is the electrical schematic diagram of the frequency control and digital-to-analog conversion module.

[0036] Figure 7 This is the electrical schematic diagram of the Doppler frequency offset compensation module. DETAILED DESCRIPTION

[0037] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0038] An airborne multi-rate satellite signal transmitting device applied to a fixed-wing aircraft, the implementation principle diagram of which includes a high-speed service access module 1, an interface management module 2, a control module 3, a channel coding module 4, an information collection module 5, a framing and mapping module 6, a shaping filter and interpolation module 7, a frequency point control and digital-to-analog conversion module 8, a Doppler frequency offset correction module 9, and a Ku up-conversion module 10. The high-speed service access module 1 mainly completes the transmission of video, image, voice, scheduling and other data of the aircraft platform service system, and converts them into IP data. The interface management module 2 mainly completes the conversion of IP data and asynchronous data into synchronous data. The control module 3 mainly completes the conversion of the monitoring data of the station control computer of the fixed-wing aircraft into synchronous data, and configures it in each signal processing module. The channel coding module 4 mainly completes the encoding of LDPC. The information collection module 5 mainly completes the collection function of the aircraft platform information and the satellite communication equipment information. The framing and mapping module 6 mainly completes the framing and symbol mapping function of the physical layer data. The shaping filter and interpolation module 7 mainly completes the shaping filter and interpolation processing of the mapped data, and converts it into data that can be adapted to digital-to-analog conversion components. The frequency control and digital-to-analog conversion module 8 mainly completes the frequency control and digital-to-analog conversion of the transmitted signal. The Doppler frequency offset correction module 9 completes the frequency offset pre-compensation of the transmitted signal by calculating the Doppler of the received signal. The Ku up-conversion module 10 mainly completes the conversion of the intermediate frequency signal after Doppler correction to the Ku frequency band.

[0039] The high-speed service access module 1 of the present invention receives video information transmitted by the aircraft platform service system and converts it into synchronous data through the video encoding module 11, and converts it into IP data through the synchronous data conversion module 13. The voice information is converted into synchronous data through the voice encoding module 12, and converted into IP data through the synchronous data conversion module 13.

[0040] The interface management module 2 of the present invention converts the IP data of the high-speed service access module 1 and the asynchronous data of the control module 3 into synchronous data.

[0041] The control module 3 of the present invention receives the control information of the station control equipment, converts it into synchronization data, transmits the coding method to the channel coding module 4, completes the channel coding of different coding methods, transmits the modulation method to the framing and mapping module 6, can complete the modulation of different methods, and transmits the transmission frequency point information to the frequency point control and digital-to-analog conversion module 8.

[0042] The channel coding module 4 of the present invention mainly completes LDPC coding, and can adaptively complete LDPC coding with code rates of 1 / 2 and 3 / 4.

[0043] The information collection module 5 of the present invention mainly includes an aircraft platform serial number information generation module 14 and a satellite communication equipment status information generation module 15; wherein the aircraft platform serial number information generation module 14 uses a 4-bit WASH code to represent the serial number of the aircraft, and the satellite communication equipment status information generation module 15 uses a 16-bit WASH code to represent the status of the equipment, and after collection, a 20-bit WASH code represents the status information.

[0044] The framing and mapping module 6 of the present invention mainly includes a super-frame header generation module 16, a scattered pilot generation module 17, a framing module 18, and a symbol mapping module 19; wherein the super-frame header generation module 16 mainly uses a 64-bit PN code to generate a super-frame header of data, and the scattered pilot generation module 17 uses a 4096-bit PN code to generate. The framing module 18 inserts the data generated by the scattered pilot 17 by the super-frame header generation module 16 into the data output by the encoding module 4, adds the super-frame header generated by the super-frame header generation module 16 in front of the data, and then enters the symbol mapping module 19 to complete the symbol mapping.

[0045] The shaping filter and interpolation module 7 of the present invention comprises a shaping filter module 20, an interpolation filter module 21 and a parameter configuration module 22; wherein the shaping filter module 20 is used to complete 8-fold shaping, and the shaping and quantized data is sent to the interpolation module 21; the interpolation filter module 21 is used to receive the data sent by the shaping filter module, and perform interpolation filtering on the waveform data, and the interpolation filtering adopts a CIC filter, and at the same time outputs the shaping filter and interpolation module to the frequency control and digital-to-analog conversion module 9; the parameter configuration module 22 is used to receive the rate control signal of the control module 3, and control the interpolation multiple of the interpolation filter module 21 through the rate control signal, and the interpolation multiple can be adjusted to 4 times, 8 times, 16 times, 32 times and 64 times respectively.

[0046] The frequency point control and digital-to-analog conversion module 8 of the present invention mainly includes an output frequency point counting and control module 23, a frequency conversion module 24, an intermediate frequency modulation module 25 and an intermediate frequency conversion module 26, wherein the output frequency point counting and control module 23 is used to receive the output frequency control signal and the output level control signal sent by the control module 3, and the frequency compensation value sent by the Doppler frequency offset compensation module 9, send the frequency compensation value sent by the Doppler frequency offset compensation module 9 to the frequency conversion module 24, send the output level control signal to the intermediate frequency modulation module 25, and send the output level control signal to the intermediate frequency conversion module 26. The frequency conversion module 24 is used to receive information from the Doppler frequency offset compensation module 9 and the shaping filter and interpolation module 7, complete the Doppler pre-compensation, and output it to the intermediate frequency modulation module 25. The intermediate frequency modulation module 25 multiplies and adds the data of the frequency conversion module 24 with the sine signal and the cosine signal to generate a digital modulation signal. The frequency point of the digital modulation signal is variable, and the output power attenuation of the digital modulation signal is controlled according to the output level control signal. The modulated signal after power attenuation control is sent to the intermediate frequency conversion module 26. The intermediate frequency conversion module 26 converts the baseband signal into an intermediate frequency signal and sends it to the Ku up-conversion module 10.

[0047] The Doppler frequency deviation compensation module 9 of the present invention is mainly composed of a signal receiving module 27, a frequency deviation calculation module 28, and a digital up-conversion module 29, which mainly completes the calculation of the Doppler frequency deviation caused by the movement of the aircraft and compensates it to the sending end. Among them, the signal receiving module 27 mainly completes the clock conversion of the received AD sampled data and converts it into high-power clock data. The frequency deviation calculation module 28 mainly uses high-power Fourier transform to complete the frequency domain conversion, and obtains the frequency deviation value of the current signal through maximum value search, which is input into the digital up-conversion module 29. The value output by the digital up-conversion is output to the frequency point control and digital-to-analog conversion module 8.

[0048] Reference Figures 1 to 7In this embodiment, the present invention includes a high-speed service access module 1, an interface management module 2, a control module 3, a channel coding module 4, an information collection module 5, a framing and mapping module 6, a shaping filter and interpolation module 7, a frequency control and digital-to-analog conversion module 8, a Doppler frequency offset correction module 9, and a Ku up-conversion module 10. Figure 1 It is a principle block diagram of the present invention, wherein the high-speed service access module 1 mainly completes the video, image, voice, scheduling and other data transmitted by the aircraft platform service system, and converts them into IP data. The interface management module 2 mainly completes the conversion of IP data and asynchronous data into synchronous data. The control module 3 mainly completes the conversion of the monitoring data of the station control computer of the fixed-wing aircraft into synchronous data, and configures it in each signal processing module. The channel coding module 4 mainly completes the LDPC coding. The information collection module 5 mainly completes the collection function of the aircraft platform information and the satellite communication equipment information. The framing and mapping module 6 mainly completes the framing and symbol mapping function of the physical layer data. The shaping filter and interpolation module 7 mainly completes the shaping filter and interpolation processing of the mapped data, and converts it into data that can be adapted to digital-to-analog conversion components. The frequency control and digital-to-analog conversion module 8 mainly completes the frequency control and digital-to-analog conversion of the transmitted signal. The Doppler frequency deviation correction module 9 completes the frequency deviation pre-compensation of the transmitted signal by calculating the Doppler of the received signal. The Ku up-conversion module 10 mainly completes the conversion of the Doppler-corrected intermediate frequency signal to the Ku frequency band.

[0049] Reference Figure 2 The high-speed service access module 1 of the present invention receives the video information transmitted by the aircraft platform service system and converts it into synchronous data through the video encoding module 11, and converts it into IP data through the synchronous data conversion module 13. The voice information is converted into synchronous data through the voice encoding module 12, and converted into IP data through the synchronous data conversion module 13.

[0050] Reference Figure 3 The information collection module 5 of the present invention mainly includes an aircraft platform serial number information generation module 14 and a satellite communication equipment status information generation module 15; wherein the aircraft platform serial number information generation module 14 uses a 4-bit WASH code to represent the serial number of the aircraft, and the satellite communication equipment status information generation module 15 uses a 16-bit WASH code to represent the status of the equipment, and after collection, a 20-bit WASH code represents the status information.

[0051] Reference Figure 4The framing and mapping module 6 of the present invention mainly includes a super-frame header generation module 16, a scattered pilot generation module 17, a framing module 18, and a symbol mapping module 19; wherein the super-frame header generation module 16 mainly uses a 64-bit PN code to generate a super-frame header of data, and the scattered pilot generation module 17 uses a 4096-bit PN code to generate. The framing module 18 inserts the data generated by the scattered pilot 17 by the super-frame header generation module 16 into the data output by the encoding module 4, adds the super-frame header generated by the super-frame header generation module 16 to the front of the data, and then enters the symbol mapping module 19 to complete the symbol mapping.

[0052] Reference Figure 5 The shaping filter and interpolation module 7 of the present invention includes a shaping filter module 20, an interpolation filter module 21 and a parameter configuration module 22; wherein the shaping filter module 20 is used to complete 8-fold shaping, and the shaping and quantized data is sent to the interpolation module 21; the interpolation filter module 21 is used to receive the data sent by the shaping filter module, and perform interpolation filtering on the waveform data. The interpolation filtering adopts a CIC filter, and at the same time, the shaping filter and interpolation module are output to the frequency control and digital-to-analog conversion module 9; the parameter configuration module 22 is used to receive the rate control signal of the control module 3, and control the interpolation multiple of the interpolation filter module 21 through the rate control signal, and the interpolation multiple can be adjusted to 4 times, 8 times, 16 times, 32 times and 64 times respectively.

[0053] Reference Figure 6 The frequency point control and digital-to-analog conversion module 8 of the present invention mainly includes an output frequency point counting and control module 23, a frequency conversion module 24, an intermediate frequency modulation module 25 and an intermediate frequency conversion module 26, wherein the output frequency point counting and control module 23 is used to receive the output frequency control signal and the output level control signal sent by the control module 3, and the frequency compensation value sent by the Doppler frequency offset compensation module 9, send the frequency compensation value sent by the Doppler frequency offset compensation module 9 to the frequency conversion module 24, send the output level control signal to the intermediate frequency modulation module 25, and send the output level control signal to the intermediate frequency conversion module 26. The frequency conversion module 24 is used to receive information from the Doppler frequency offset compensation module 9 and the shaping filter and interpolation module 7, complete the Doppler pre-compensation, and output it to the intermediate frequency modulation module 25. The intermediate frequency modulation module 25 multiplies and adds the data of the frequency conversion module 24 with the sine signal and the cosine signal to generate a digital modulation signal. The frequency point of the digital modulation signal is variable, and the output power attenuation of the digital modulation signal is controlled according to the output level control signal. The modulated signal after power attenuation control is sent to the intermediate frequency conversion module 26. The intermediate frequency conversion module 26 converts the baseband signal into an intermediate frequency signal and sends it to the Ku up-conversion module 10.

[0054] Reference Figure 7The Doppler frequency deviation compensation module 9 of the present invention is mainly composed of a signal receiving module 27, a frequency deviation calculation module 28, and a digital up-conversion module 29, which mainly completes the calculation of the Doppler frequency deviation caused by the movement of the aircraft and compensates it to the transmitting end. Among them, the signal receiving module 27 mainly completes the clock conversion of the received AD sampled data and converts it into high-power clock data. The frequency deviation calculation module 28 mainly uses high-power Fourier transform to complete the frequency domain conversion, obtains the frequency deviation value of the current signal through the maximum value search, and inputs it into the digital up-conversion module 29. The value output by the digital up-conversion is output to the frequency point control and digital-to-analog conversion module 8.

[0055] The present invention briefly works as follows:

[0056] The high-speed service access module 1 mainly completes the video, image, voice, scheduling and other data transmitted by the aircraft platform service system, and converts them into IP data, which is passed to the interface management module 2. The interface management module 2 mainly completes the conversion of IP data and asynchronous data into synchronous data, and enters the channel coding module 4. The control module 3 mainly completes the conversion of the monitoring data of the station control computer of the fixed-wing aircraft into synchronous data, and configures it in each signal processing module. The channel coding module 4 mainly completes the LDPC encoding, and then enters the framing and mapping module 6. The information collection module 5 mainly completes the collection function of the aircraft platform information and the satellite communication equipment information. The framing and mapping module 6 mainly completes the framing of the data of the channel coding module 4 at the physical layer and enters the shaping filter and interpolation module 7. The shaping filter and interpolation module 7 mainly completes the shaping filter and interpolation processing of the mapped data, converts it into data that can be adapted to digital-to-analog conversion, and enters the frequency control and digital-to-analog conversion module 8. The frequency control and digital-to-analog conversion module 8 mainly completes the frequency control and digital-to-analog conversion of the transmitted signal, and the data after digital-to-analog conversion enters the Ku up-conversion module 10. The Doppler frequency offset correction module 9 completes the frequency offset pre-compensation of the transmitted signal by calculating the Doppler of the received signal, and sends the pre-compensated value to the frequency point control and digital-to-analog conversion module 8 .

Claims

1. An airborne multi-rate satellite signal transmitting device for a fixed-wing aircraft, characterized in that: It includes a high-speed service access module (1), an interface management module (2), a control module (3), a channel coding module (4), an information collection module (5), a framing and mapping module (6), a shaping filter and interpolation module (7), a frequency point control and digital-to-analog conversion module (8), a Doppler frequency offset correction module (9) and a Ku up-conversion module (10); The high-speed service access module (1) is used to receive video, image, voice and dispatch data transmitted by the aircraft platform service system and convert them into IP data; The interface management module (2) is used to convert the IP data of the high-speed service access module (1) and the asynchronous data of the control module (3) into synchronous data; The control module (3) is used to receive control information of the station control device, convert it into synchronization data, transmit the encoding mode to the channel encoding module (4), transmit the modulation mode to the framing and mapping module (6), and transmit the transmission frequency point information to the frequency point control and digital-to-analog conversion module (8); The channel coding module (4) is used to complete LDPC coding, and can adaptively complete LDPC coding with a code rate of 1 / 2 or 3 / 4; The information collection module (5) is used to collect aircraft platform information and satellite communication equipment information; The framing and mapping module (6) is used to complete the framing and symbol mapping functions of the physical layer data; The shaping filtering and interpolation module (7) is used to perform shaping filtering and interpolation processing on the mapped data, and convert it into data that can be adapted to digital-to-analog conversion components; The frequency control and digital-to-analog conversion module (8) is used to complete the frequency control and digital-to-analog conversion of the transmitted signal; The Doppler frequency offset correction module (9) performs frequency offset pre-compensation of the transmitted signal by calculating the Doppler of the received signal; The Ku up-conversion module (10) is used to convert the intermediate frequency signal after Doppler correction into the Ku frequency band; After receiving the transmission data from the aircraft platform service system, the high-speed service access module converts it into IP data, and converts the converted IP data into synchronization data through the interface management module; the control module converts the monitoring data of the station control computer of the fixed-wing aircraft into synchronization data; after receiving the synchronization data from the interface management module and the control module, the channel coding module performs LDPC coding and sends the coded information to the framing and mapping module; the information collection module collects the aircraft platform information and the satellite communication equipment information and sends them to the framing and mapping module; then, the framing and mapping module collects the information from the information collection module and the channel coding module, and sends the information to the framing and mapping module. The data of the code module is framed at the physical layer, and the framed information enters the shaping filter and interpolation module; the shaping filter and interpolation module completes the shaping filter and interpolation processing of the mapped data, converts it into data that can be adapted to digital-to-analog conversion, and enters the frequency control and digital-to-analog conversion module; the Doppler frequency offset correction module completes the frequency offset pre-compensation of the transmitted signal by calculating the Doppler of the received signal, and sends the pre-compensated value to the frequency control and digital-to-analog conversion module; the frequency control and digital-to-analog conversion module completes the frequency control and digital-to-analog conversion of the transmitted signal, and the data after digital-to-analog conversion enters the Ku up-conversion module, and the frequency control data enters the control module.

2. The airborne multi-rate satellite signal transmitting device for a fixed-wing aircraft according to claim 1, characterized in that: The high-speed service access module (1) comprises a video encoding module (11), a voice encoding module (12) and a synchronous data conversion module (13); the high-speed service access module receives video information transmitted by the aircraft platform service system and converts it into synchronous data through the video encoding module (11), and then converts it into IP data through the synchronous data conversion module (13); the voice information is converted into synchronous data through the voice encoding module (12), and then converted into IP data through the synchronous data conversion module (13).

3. The airborne multi-rate satellite signal transmitting device for fixed-wing aircraft according to claim 1, characterized in that: The information collection module (5) comprises an aircraft platform serial number information generation module (14) and a satellite communication equipment status information generation module (15); wherein the aircraft platform serial number information generation module (14) uses a 4-bit WASH code to represent the aircraft serial number, and the satellite communication equipment status information generation module (15) uses a 16-bit WASH code to represent the status of the equipment, and after collection, status information represented by a 20-bit WASH code is formed.

4. The airborne multi-rate satellite signal transmitting device for fixed-wing aircraft according to claim 1, characterized in that: The framing and mapping module (6) comprises a superframe header generation module (16), a scattered pilot generation module (17), a framing module (18) and a symbol mapping module (19); wherein the superframe header generation module uses a 64-bit PN code to generate a superframe header of data, and the scattered pilot generation module uses a 4096-bit PN code to generate data; the framing module inserts the data generated by the superframe header generation module and the scattered pilot generation module into the data output by the framing module, adds the superframe header generated by the superframe header generation module to the front of the data, and then enters the symbol mapping module to complete the symbol mapping.

5. The airborne multi-rate satellite signal transmitting device for fixed-wing aircraft according to claim 1, characterized in that: The shaping filter and interpolation module comprises a shaping filter module (20), an interpolation filter module (21) and a parameter configuration module (22); wherein the shaping filter module is used to complete 8-fold shaping, and the shaping quantized data is sent to the interpolation filter module; The interpolation filter module (21) is used to receive data sent by the shaping filter module and perform interpolation filtering on the waveform data. The interpolation filtering adopts a CIC filter and outputs the shaping filter and the interpolation module to the frequency control and digital-to-analog conversion block. The parameter configuration module (22) is used to receive the rate control signal of the control module and control the interpolation multiple of the interpolation filter module through the rate control signal. The interpolation multiple can be adjusted to 4 times, 8 times, 16 times, 32 times or 64 times.

6. The airborne multi-rate satellite signal transmitting device for fixed-wing aircraft according to claim 1, characterized in that: The frequency point control and digital-to-analog conversion module comprises an output frequency point counting and control module (23), a frequency conversion module (24), an intermediate frequency modulation module (25) and an intermediate frequency conversion module (26), wherein the output frequency point counting and control module is used to receive an output frequency control signal and an output level control signal sent by the control module, as well as a frequency compensation value sent by the Doppler frequency offset compensation module, send the frequency compensation value sent by the Doppler frequency offset compensation module to the frequency conversion module, send the output level control signal to the intermediate frequency modulation module, and send the output level control signal to the intermediate frequency conversion module; The frequency conversion module is used to receive information from the Doppler frequency offset compensation module and the shaping filter and interpolation module (7), complete Doppler pre-compensation, and output it to the intermediate frequency modulation module. The intermediate frequency modulation module multiplies and adds the data of the frequency conversion module with the sine signal and the cosine signal to generate a digital modulation signal. The frequency point of the digital modulation signal is variable, and the output power attenuation of the digital modulation signal is controlled according to the output level control signal. The modulated signal after power attenuation control is sent to the intermediate frequency conversion module. The intermediate frequency conversion module converts the baseband signal into an intermediate frequency signal and sends it to the Ku up-conversion module.

7. The airborne multi-rate satellite signal transmitting device for fixed-wing aircraft according to claim 6, characterized in that: The Doppler frequency deviation compensation module comprises a signal receiving module (27), a frequency deviation calculation module (28) and a digital up-conversion module (29), which are used to complete the calculation of the Doppler frequency deviation generated by the movement of the aircraft and compensate it to the transmitting end, wherein the signal receiving module completes the clock conversion of the received AD sampled data and converts it into high-power clock data, and the frequency deviation calculation module mainly uses high-power Fourier transform to complete the frequency domain conversion, obtains the frequency deviation value of the current signal by maximum value search, and inputs it into the digital up-conversion module, and the value output by the digital up-conversion is output to the frequency point control and digital-to-analog conversion module.

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