A multi-mode multi-rate satellite signal transmitting device suitable for a rotorcraft

Abstract

The application discloses a multi-mode multi-rate satellite signal transmitting device suitable for a rotorcraft, and relates to the technical field of satellite communication. The device comprises a monitoring generation module, a multi-mode control module, a service access module, a fountain coding module, an interface management module, a coding interleaving module, a data group framing module, a data retransmission module, a data modulation module and an intermediate frequency processing and control module. The multi-mode control module receives modulation coding information and transmission mode information transmitted by the monitoring generation module, and sends the transmission mode information to the fountain coding module, the coding interleaving module and the data retransmission module respectively, sends modulation mode information to the data modulation module, and sends coding mode to the coding interleaving module. The application can overcome the influence of rotorcraft rotor shielding on satellite signal transmission, adopts a multi-mode switching technology, and can select a suitable anti-rotor shielding mode according to different rotorcraft rotor speeds and different satellite conditions.

Description

Technical Field

[0001] This invention relates to the field of satellite communication, and is particularly suitable for rotorcraft satellite communication systems, specifically a multi-mode, multi-rate satellite signal transmitting device suitable for rotorcraft. Background Technology

[0002] Adding satellite communication equipment to helicopters presents a significant challenge due to the helicopter's structural limitations. The equipment must be mounted beneath the rotor, leading to signal interference during communication between the aircraft and the ground. This interference can affect demodulation. Furthermore, the diverse communication services required between helicopters and the ground necessitate support for multiple communication rates from the satellite communication equipment. Designing a multi-mode, multi-rate transmitter adaptable to the specific needs of helicopters presents a major challenge for satellite communication equipment. Summary of the Invention

[0003] To address the signal transmission problem of such airborne satellite communication equipment, this invention proposes a multi-mode, multi-rate satellite signal transmitting device suitable for rotary-wing aircraft.

[0004] The technical solution adopted in this invention is as follows:

[0005] A multi-mode, multi-rate satellite signal transmitting device suitable for rotary-wing aircraft includes a monitoring and generation module, a multi-mode control module, a service access module, a fountain coding module, an interface management module, a coding interleaving module, a data framing module, a data retransmission module, a data modulation module, and an intermediate frequency processing and control module.

[0006] The monitoring generation module generates monitoring information for the aircraft display console and transmits the monitoring information to the multi-mode control module. The multi-mode control module receives the modulation and coding information and transmission mode information transmitted by the monitoring generation module and sends the transmission mode information to the fountain coding module, the coding interleaving module, and the data retransmission module, respectively. The modulation method information in the modulation and coding information is sent to the data modulation module, and the coding method information is sent to the coding interleaving module.

[0007] The fountain encoding module receives instructions from the multi-mode control module and service information from the service access module, determines whether encoding is required, and if so, encodes the service data using Raptor codes and sends the encoded data to the interface management module. The interface management module converts the serial service data into parallel data based on the received modulation and encoding parameters, performs scrambling, and then passes it to the encoding and interleaving module.

[0008] The encoding interleaving module performs interleaving processing on the encoded data and sends it to the data framing module. The data framing module multiplexes the encoded interleaved data, adds a frame header and a unique word to complete data framing, and sends the framed data to the data retransmission module. The data retransmission module receives instructions from the multi-mode control module, determines whether retransmission is needed, and if so, repeatedly splices three consecutive frames of data and sends them to the data modulation module. The data modulation module performs data mapping and shaping filtering processing and then sends the data to the intermediate frequency processing and control module. The intermediate frequency processing and control module performs digital resampling, parallel-to-serial conversion, quadrature up-conversion, and intermediate frequency conversion functions to convert the data into an intermediate frequency signal.

[0009] Furthermore, the interface management module is used to convert IP data into synchronous data, store data link frames in a buffer, and use dynamic caching technology to adjust the upper limit of the buffer capacity according to the currently received modulation and coding parameters, and convert serial service data into parallel data to complete scrambling.

[0010] Furthermore, the multi-mode control module includes, in sequence, an instruction receiving module, an instruction parsing module, an instruction recognition module, and an instruction issuing module;

[0011] The instruction receiving module receives monitoring information from the monitoring generation module; the instruction parsing module parses the specific mode corresponding to the modulation coding and transmission mode according to the frame protocol; the instruction identification module judges the parameters corresponding to the received modulation coding and transmission mode. If it is a mode supported by the transmitting device, the parameters are transmitted to the instruction issuing module; otherwise, the original state is maintained; the instruction issuing module sends the transmission mode parameters to the fountain coding module, the channel coding module, and the data retransmission module, and sends the modulation method to the data modulation module and the coding method to the channel coding module.

[0012] Furthermore, the interface management module includes an interface adaptation module, a data caching module, a serial-to-parallel conversion module, a data scrambling module, a read control module, and a dynamic management module;

[0013] The interface adaptation module receives IP data from the fountain encoding module, converts the IP data into synchronous data, and transmits it to the data buffer module. The data buffer module serially stores the synchronous data into the memory, reads it with a high-multiplier clock, generates a parallel data stream, and then transmits the parallel data stream to the data scrambling module to complete the scrambling of the parallel data.

[0014] The dynamic management module receives control signals from the multi-mode control module and generates enable signals for accessing and reading data based on the rate parameters and modulation coding parameters of the multi-mode control module. The read control module receives the data enable signal from the dynamic management module and reads data from the data buffer module under the drive of the data enable signal.

[0015] Furthermore, the intermediate frequency processing and control module includes a digital resampling module, a parallel-to-serial conversion module, a quadrature upconversion module, an intermediate frequency conversion module, and a control module;

[0016] The digital resampling module receives data from the data modulation module and converts the data rate, transmitting the data at a clock speed of 120MHz to the parallel-to-serial conversion module and the quadrature up-conversion module;

[0017] The parallel-to-serial conversion module receives data from the digital resampling module, converts the parallel data into serial data, and transmits it to the quadrature upconverter module;

[0018] The quadrature upconverter module receives data from the parallel-to-serial conversion module and frequency control words from the digital resampling module, and converts the frequency of the data from baseband to 390MHz;

[0019] The intermediate frequency converter module receives data from the quadrature upconverter module and converts the 390MHz signal to a C-band intermediate frequency signal;

[0020] The control module is used to configure the parameters of the digital resampling module and the intermediate frequency converter module, and to configure the frequency control word and enable signal.

[0021] The present invention has the following beneficial effects:

[0022] (1) The present invention can overcome the impact of helicopter rotor blockage on satellite signal transmission. It adopts multi-mode switching technology and can select the appropriate anti-rotor blockage method according to different helicopter rotor speeds and different satellite conditions.

[0023] (2) The present invention can transmit information rate signals of 16kbps to 2Mbps and can map BPSK and QPSK signals in various modulation modes.

[0024] (3) The present invention adopts multi-rate adaptive transmission technology, which can adjust the working mode according to the link status, ensure user communication quality and transmission efficiency, and achieve a simple architecture with the characteristics of simplicity and strong practicality. Attached Figure Description

[0025] Figure 1 This is an electrical principle block diagram of the transmitting device of the present invention.

[0026] Figure 2 This is an electrical principle block diagram of the multi-mode control module of the present invention.

[0027] Figure 3 This is a block diagram of the electrical principle of the interface management module of the present invention.

[0028] Figure 4 This is an electrical principle block diagram of the intermediate frequency processing and control module of the present invention. Detailed Implementation

[0029] Reference Figures 1 to 4 The present invention will be further explained and described below.

[0030] Reference Figure 1 The present invention includes a monitoring generation module, a multi-mode control module, a service access module, a fountain encoding module, an interface management module, an encoding interleaving module, a data framing module, a data retransmission module, a data modulation module, and an intermediate frequency processing and control module.

[0031] Figure 1 This is a block diagram of the principle of the present invention, wherein the monitoring generation module is used to realize the monitoring information generated by the aircraft display console and transmit the monitoring information to the multi-mode control module;

[0032] The multi-mode control module receives modulation and coding information, transmission mode and other information transmitted by the monitoring and generation module, and identifies three modulation methods, three coding methods and three transmission modes. It then sends the transmission mode information to the fountain coding module, the channel coding module and the data retransmission module, and sends the modulation method to the data modulation module and the coding method to the coding interleaving module.

[0033] The service access module primarily handles the access of video, voice, and IP services. The fountain coding module receives instructions from the multi-mode control module, determines whether encoding is required, and if so, encodes the service data using Raptor codes, then sends the encoded data to the interface management module. The interface management module primarily converts IP data into synchronization data, stores data link frames in a buffer, and uses dynamic caching technology to adjust the buffer's capacity limit based on the currently received modulation and coding parameters. It also converts serial service data into parallel data, performs scrambling, and passes it to the coding-interleaving module. The coding-interleaving module primarily performs channel coding at different code rates, including 1 / 3 and... 1 / 4 of the data is encoded using LDPC encoding. The encoded data is then interleaved and sent to the data framing module. The data framing module multiplexes the encoded and interleaved data, adds a frame header and a unique word to complete the data framing, and sends the framed data to the data retransmission module. The data retransmission module receives instructions from the multi-mode control module and determines whether retransmission is needed. If retransmission is needed, it repeatedly splices three consecutive frames of data and sends them to the data modulation module. The data modulation module performs data mapping, shaping, and filtering, and sends the processed data to the intermediate frequency processing and control module. The intermediate frequency processing and control module mainly performs functions such as digital resampling, parallel-to-serial conversion, quadrature up-conversion, and intermediate frequency conversion to convert the data into an intermediate frequency signal.

[0034] Reference Figure 2 The multi-mode control module in this embodiment includes an instruction receiving module, an instruction parsing module, an instruction recognition module, and an instruction issuing module. Figure 2 This is a block diagram illustrating the principle of the present invention.

[0035] The instruction receiving module receives monitoring information from the monitoring generation module; the instruction parsing module parses the specific mode corresponding to the modulation coding and transmission mode according to the frame protocol; the instruction identification module judges the parameters corresponding to the received modulation coding and transmission mode, and if it is a mode supported by the transmitting device, it transmits the parameters to the instruction sending module; otherwise, it maintains the original state; the instruction sending module sends the transmission mode parameters to the fountain coding module, the channel coding module, and the data retransmission module, and sends the modulation method to the data modulation module and the coding method to the channel coding module.

[0036] Reference Figure 3 The interface management module in this embodiment includes an interface adaptation module, a data caching module, a serial-to-parallel conversion module, a data scrambling module, a read control module, and a dynamic management module. Figure 3 This is a block diagram illustrating the principle of the present invention. The interface adaptation module receives IP data from the fountain coding module, converts the IP data into synchronous data, and transmits it to the data buffer module. The data buffer module serially stores the synchronous data into a memory, then reads it using a high-frequency clock to generate a parallel data stream. This parallel data stream is then transmitted to the data scrambling module to scramble the parallel data. The read control module receives a data enable signal from the dynamic management module and, driven by this signal, reads data from the data buffer module. The dynamic management module primarily receives control signals from the multi-mode control module and generates enable signals for accessing and reading data based on the rate parameters and modulation / coding parameters of the multi-mode control module.

[0037] Reference Figure 4 The intermediate frequency processing and control module in this embodiment includes a digital resampling module, a parallel-to-serial conversion module, a quadrature upconversion module, an intermediate frequency conversion module, and a control module. Figure 4 This is a block diagram illustrating the principle of this invention. The digital resampling module receives data from the data modulation module and converts the data rate, transmitting the data at a 120MHz clock speed to the next-stage module (parallel-to-serial conversion module and quadrature upconversion module). The parallel-to-serial conversion module receives data from the digital resampling module, converts the parallel data into serial data, and transmits it to the next-stage module (quadrature upconversion module). The digital resampling module transmits a frequency control word to the quadrature upconversion module to convert the baseband signal into a low-IF signal. The quadrature upconversion module receives data from the parallel-to-serial conversion module and converts the data frequency from baseband to 390MHz. The intermediate frequency conversion module receives data from the quadrature upconversion module and converts the 390MHz signal to a C-band intermediate frequency signal. The control module mainly performs parameter setting and configuration functions for the digital resampling module and the intermediate frequency conversion module, configuring the frequency control word and enable signal.

[0038] The basic working steps of this invention are as follows:

[0039] (1) The monitoring generation module realizes the monitoring information generated by the aircraft display console. The monitoring information receives the modulation and coding information, transmission mode and other information transmitted by the monitoring generation module through the multi-mode control module, and identifies three modulation methods, three coding methods and three transmission modes. The transmission mode information is sent to the fountain coding module, the channel coding module and the data retransmission module, and the modulation method is sent to the data modulation module and the coding method is sent to the coding interleaving module.

[0040] (2) The service access module mainly completes the access of video services, voice services and IP services, and connects the services on the aircraft to the airborne transmitting device;

[0041] (3) The fountain coding module receives the instruction from the multi-mode control module, determines whether encoding is required, and if encoding is required, it uses Raptor code to encode the service data, sends the encoded data to the interface management module to complete the conversion of IP data into synchronization data, stores the data link frame in the buffer, and uses dynamic buffering technology to adjust the upper limit of the buffer capacity according to the currently received modulation and coding parameters, converts the serial service data into parallel data, completes scrambling, and passes it to the channel coding module to complete channel coding at different code rates, including 1 / 3 and 1 / 4 LDPC coding, and completes interleaving processing on the encoded data;

[0042] (4) The data framing module completes the data framing by encoding and interleaving the data multiplexing frame header and unique words, and sends the framed data to the data retransmission module for repeated splicing of three consecutive frames of data, and sends it to the data modulation module to complete the data mapping, shaping and filtering processing, and sends the processed data to the intermediate frequency processing and control module to complete the functions of digital resampling, parallel-to-serial conversion, quadrature upconversion, intermediate frequency conversion, etc., and converts it into an intermediate frequency signal.

Claims

1. A multi-mode multi-rate satellite signal transmitting device suitable for use in a rotorcraft, characterized in that, The monitoring generation module, the multi-mode control module, the service access module, the fountain encoding module, the interface management module, the encoding interleaving module, the data group framing module, the data retransmission module, the data modulation module and the intermediate frequency processing and control module are included. The monitoring generation module generates monitoring information of the aircraft display console and transmits the monitoring information to the multi-mode control module; the multi-mode control module receives the modulation and encoding information and the transmission mode information transmitted by the monitoring generation module, and sends the transmission mode information to the fountain encoding module, the encoding interleaving module and the data retransmission module respectively; the modulation mode information in the modulation and encoding information is sent to the data modulation module, and the encoding mode information is sent to the encoding interleaving module; The fountain encoding module receives the instructions of the multi-mode control module and the service information from the service access module, judges whether encoding is needed, and if so, encodes the service data using Raptor code, and sends the encoded data to the interface management module; The interface management module converts the serial service data into parallel data according to the received modulation and encoding parameters, completes scrambling, and delivers to the encoding interleaving module; The encoding interleaving module completes interleaving processing on the encoded data and sends to the data group framing module; the data group framing module completes data group framing on the encoded and interleaved data by adding a frame header and a unique word, and sends the framed data to the data retransmission module; the data retransmission module receives the instructions of the multi-mode control module, judges whether retransmission is needed, and if so, performs continuous three-frame data repetition splicing and sends to the data modulation module; The data modulation module completes data mapping and shaping filter processing and sends to the intermediate frequency processing and control module; the intermediate frequency processing and control module completes digital resampling, parallel-serial conversion, quadrature up-conversion, intermediate frequency conversion functions, and converts into intermediate frequency signals; The multi-mode control module includes sequentially connected instruction receiving module, instruction analysis module, instruction recognition module and instruction issuing module; The instruction receiving module receives the monitoring information transmitted by the monitoring generation module; the instruction analysis module analyzes the modulation and encoding, the corresponding specific mode of the transmission mode according to the frame protocol; the instruction recognition module judges the parameters corresponding to the received modulation and encoding, transmission mode, if it is the mode supported by the transmitting device, the parameters are transmitted to the instruction issuing module, otherwise the original state is maintained; the instruction issuing module sends the transmission mode parameters to the fountain encoding module, the channel encoding module and the data retransmission module, the modulation mode to the data modulation module, and the encoding mode to the channel encoding module; The intermediate frequency processing and control module includes a digital resampling module, a parallel-serial conversion module, a quadrature up-conversion module, an intermediate frequency conversion module and a control module; The digital resampling module receives the data of the data modulation module and converts the data rate, and transmits the data to the parallel-serial conversion module and the quadrature up-conversion module at a clock of 120MHz; The parallel-serial conversion module receives the data of the digital resampling module, converts the parallel data into serial data, and transmits to the quadrature up-conversion module; The quadrature up-conversion module receives the data of the parallel-serial conversion module and the frequency control word issued by the digital resampling module, and converts the frequency of the data from baseband to 390MHz; The intermediate frequency conversion module receives data of the quadrature up-conversion module, and converts a 390MHz signal into an intermediate frequency signal in a C frequency band; The control module is configured to complete parameter setting and configuration of the digital resampling module and the intermediate frequency conversion module, configure a frequency control word and an enable signal.

2. A multi-mode multi-rate satellite signal transmitting device for use in a rotary wing aircraft according to claim 1, characterized in that, The interface management module comprises an interface adaptation module, a data buffer module, a serial-parallel conversion module, a data scrambling module, a read control module and a dynamic management module. The interface adaptation module receives IP data transmitted by the fountain encoding module, converts the IP data into synchronous data, and transmits the synchronous data to the data buffer module. The dynamic management module receives a control signal of the multi-mode control module, generates an enable signal of access data and read data according to a rate parameter and a modulation and coding parameter of the multi-mode control module, and the read control module receives data enable signals transmitted by the dynamic management module, and reads data of the data buffer module under the drive of the data enable signals.

3. A multi-mode multi-rate satellite signal transmitting device for use in a rotary wing aircraft as claimed in claim 1, wherein, The interface management module is configured to complete conversion of IP data into synchronous data, store data link frames into a buffer, and adopt a dynamic buffer technology to adjust an upper limit of a capacity of the buffer according to currently received modulation and coding parameters, and convert serial industry data into parallel data and complete scrambling.

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