CN106059653B - Aircraft signal transmission system and signal transmission method thereof - Google Patents
Aircraft signal transmission system and signal transmission method thereof Download PDFInfo
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- CN106059653B CN106059653B CN201610622976.1A CN201610622976A CN106059653B CN 106059653 B CN106059653 B CN 106059653B CN 201610622976 A CN201610622976 A CN 201610622976A CN 106059653 B CN106059653 B CN 106059653B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/18502—Airborne stations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/18502—Airborne stations
- H04B7/18506—Communications with or from aircraft, i.e. aeronautical mobile service
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18515—Transmission equipment in satellites or space-based relays
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Abstract
The invention discloses an aircraft signal transmission system, which comprises a BDS antenna for receiving satellite navigation information, a BDS unit connected with the BDS antenna, an ADS-B interface unit connected with the BDS unit, an ADS-B message coding unit connected with the ADS-B interface unit, a 1090ES radio frequency transmitting unit and a Beidou transmitting unit connected with the ADS-B message coding unit, can realize full airspace transmission in the range covered by the Beidou satellite, so only one Beidou ground command center for receiving the message information needs to be built, the coverage of no blind area and full airspace in the Asia-Pacific region can be realized at present, and in the future, with the global coverage of the Beidou, the device can realize global non-blind area coverage, simultaneously utilizes the matching of the PPS time slot and the local random time slot to transmit the message, avoids transmission interference, and simultaneously utilizes a good message coding mode to realize RS coding.
Description
Technical Field
The invention relates to the field of aircraft positioning, in particular to an aircraft signal transmission system and a signal transmission method thereof.
Background
ADS-B (Automatic Dependent Surveillance-Broadcast) is an emerging monitoring technology recommended by ICAO in a new navigation system, is an aircraft operation monitoring technology based on satellite positioning and ground/air data link communication, and is mainly characterized in that aircraft position data from airborne equipment is automatically transmitted to a ground receiving and processing system in real time through a ground-air data link, so that related personnel can provide accurate and efficient monitoring services.
The core technology of the ADS-B system comprises the following steps: GNSS and ground-air/air-air data links. Throughout the world, most ADS-B GNSS signal sources adopted at present are GPS navigation signal sources, and only a few systems adopt Glonass as backup navigation signal sources. At present, the Beidou satellite navigation system is built to cover an Asian area, and a technical basis can be provided for the application of the Beidou in the field of civil aviation navigation.
The ADS-B data chain system currently mainly includes three types: 1) 1090ES data chain based on the transponder of the S mode; 2) a Universal Access Transceiver (UAT) datalink; 3) mode 4 very high frequency data link (VDL-4).
The common features of these three data chains are: the finite of the transmission distance, the communication distance of the ADS-B in 1090ES, UAT mode and VDL4 mode does not exceed 400KM at most, therefore, the ADS-B ground receiving station needs to be built in the area within 400KM of each radius.
Disclosure of Invention
The invention provides an aircraft signal transmission system and a signal transmission method thereof, which solve the problem that the maximum communication distance of ADS-B in 1090ES, UAT mode and VDL4 mode does not exceed 400KM, so that ADS-B ground receiving stations are required to be built in an area within 400KM of each radius.
The aircraft signal transmission system comprises a BDS antenna for receiving satellite navigation information, a BDS unit connected with the BDS antenna, an ADS-B interface unit connected with the BDS unit, an ADS-B message coding unit connected with the ADS-B interface unit, a UAT radio frequency transmitting unit and a Beidou transmitting unit, wherein the UAT radio frequency transmitting unit and the Beidou transmitting unit are connected with the ADS-B message coding unit.
According to the invention, the Beidou satellite based airborne ADS-B transmitter selects Beidou as a GNSS navigation source of the system, a data link of the Beidou satellite based airborne ADS-B transmitter supports the traditional ADS-B UAT data link and Beidou short message communication link dual modes, and the equipment encodes ADS-B messages according to ADS-B, transmits the ADS-B messages on the UAT link of the ADS-B and transmits the ADS-B messages on the Beidou short message data link, so that a double-link parallel transmission mechanism is realized. And the UAT link of the ADS-B is a UAT radio frequency transmitting unit, and the Beidou short message data link is a Beidou transmitting unit.
In airport terminal area, ADS-B ground receiving station in airport can receive ADS-B message broadcasted by the equipment on UAT link according to 1/s, in the remote navigation area, especially the area which cannot be covered by ADS-B ground station, the equipment continues to transmit ADS-B messages by using the Beidou short messages at a lower frequency (1-5 times/minute) for receiving by the Beidou ground command center, and as the messages are broadcast by the satellite, therefore, the link is not influenced by the distance, and the full airspace transmission can be realized in the range covered by the Beidou satellite, so that only one Beidou ground command center for receiving the message information needs to be built, the coverage of no blind area and full airspace in the Asia-Pacific region can be realized at present, and in the future, with the global coverage of the Beidou, the equipment can realize the global coverage without the blind area.
Preferably, the BDS/GPS unit includes a baseband unit a and an interface unit a connected to the baseband unit a, the ADS-B interface unit includes an interface unit B and an NIC check module connected to the interface unit B, the interface unit a is connected to the NIC check module through the interface unit B, and the NIC check module is connected to the ADS-B message encoding unit. The base band processing is completed through the BDS/GPS unit, and the verification of the positioning information is completed through the ADS-B interface unit.
The Beidou antenna receives position information from a satellite, the position information is sent to the ADS-B interface unit through a fracture in the outer part and an RS232 interface after baseband processing, and the position information is sent to the ADS-B message coding unit after verification through an NIC (navigation integrity verification) module.
The ADS-B message coding unit comprises a synchronous judgment module connected with the NIC check module, the synchronous judgment module is connected with an RS coding module, the RS coding module is connected with a CRC24 check module, the CRC24 check module is connected with a buffer memory, the ADS-B message coding unit further comprises a local time slot unit and an ADS-B sending control module, and the ADS-B sending control module is connected with the NIC check module, the local time slot unit and the buffer memory.
Through the structure, the positioning information sending is controlled, a proper sending gap is selected so that the positioning information can be sent to other equipment, the ADS-B message coding unit codes the position information, and after the coding is completed, coded message information is formed, the coded message information cannot be sent out at the moment, the coded message information is sent out after the local time slot generated by the local time slot unit is utilized, the PPS time slot of the positioning information is utilized, the ADS-B sending control module judges that the local time slot is consistent with the PPS time slot, and therefore the sending time slot is generated by utilizing the rising edge of the external BDS synchronizing signal PPS.
The Beidou transmitting unit comprises a baseband unit B, a radio frequency unit connected with the baseband unit B, a BDS antenna connected with the radio frequency unit, and an SIM connected with the baseband unit B, wherein the baseband unit B is connected with a buffer memory. In a Beidou transmitting unit (Beidou short message transmitting unit), coded message information (ADS-B messages) is input into a Beidou message communication unit, and the messages are sent to a Beidou command center through a satellite link through a Beidou subscriber card.
The UAT radio frequency transmitting unit comprises CPFSK modulation, prevention connected with the CPFSK modulation, a power amplifier connected with the prevention, a 978MHz antenna connected with the power amplifier, a frequency mixing connected with the CPFSK modulation, and a local oscillator connected with the frequency mixing, wherein the CPFSK modulation is connected with a buffer memory. In the UAT radio frequency transmitting unit, the coded message information (ADS-B message) is subjected to local oscillation, frequency mixing, CPFSK modulation, preamplification, pushing and power amplification and then is subjected to radio frequency broadcasting at the frequency of 978 MHZ.
Preferably, the invention uses the RS coding module to perform coding processing, the RS coding module comprises a synchronous judgment module receiving unit connected with the synchronous judgment module, the synchronous judgment module receiving unit is connected with a Block RAM, a system time sequence and coding type control circuit, a register group s, a register group w, a register group b, and G (2)m) The output ends of the operation circuit, the register group s, the register group w and the register group b are all connected with G (2)m) Operational circuit connection, G (2)m) The output end of the operational circuit is connected with the input ends of the register group s, the register group w and the register group b, the operational circuit also comprises a MUX (multiplexer), the output end of the Block RAM (random Access memory), the output end of the system time sequence and coding type control circuit and the output end of the register group s are all connected with the MUX, the MUX is also connected with a message decoderThe analysis unit is connected with a message type indication end of the system time sequence and coding type control circuit, and comprises a Block RAM, a register group s, a register group w, a register group b and a register group G (2)m) The arithmetic circuit is controlled by a system time sequence and coding type control circuit, and the message analysis unit is connected with the CRC24 check module.
Detecting a synchronous signal by processing an original baseband code element sequence in the position information through a synchronous judgment module, judging that the synchronous signal arrives and determining the occurrence position of data bits in each message data according to the synchronous signal, extracting baseband message data, and delivering the baseband message data to an RS coding module for coding processing, and meanwhile judging the message type of the baseband message data according to the type of a synchronous head;
and the synchronous judging module judges the message type.
The system time sequence and coding type control circuit controls data of different message types to enter corresponding coding paths.
When the message type is a FIS-B message, encoding for 6 times by using the RS (92, 72); and the MUX, the Block RAM (random access memory), the system timing and coding type control circuit complete RS (92,72) coding.
When the message type is not a FIS-B message, then the message is encoded using RS (30,18) and RS (48,34), wherein the system timing and encoding type control circuit, register set s, register set w, register set B, and G (2)m) The operation circuit group completes the RS (30,18) coding algorithm.
The signal transmission method based on the aircraft signal transmission system comprises the following steps:
receiving satellite navigation information through a BDS antenna;
the BDS unit processes the satellite navigation information through a baseband to obtain position information and a PPS time slot;
navigation integrity verification is carried out on the position information and the PPS time slot through an ADS-B interface unit, and the verified position information and the PPS time slot are sent to an ADS-B message coding unit;
the ADS-B message coding unit codes the position information according to the ADS-B message coding rule to obtain coded message information, a local time slot is randomly generated, the ADS-B message coding unit obtains a synchronous signal, when the current synchronous signal arrives, the consistency of the local time slot and the PPS time slot is judged, and when the local time slot and the PPS time slot are consistent, the coded message information is triggered to be sent to the UAT radio frequency transmitting unit and the Beidou transmitting unit.
The specific process of obtaining the coded message information by coding the position information by the ADS-B message coding unit according to the ADS-B message coding rule comprises the following steps:
detecting a synchronous signal by processing an original baseband code element sequence in the position information through a synchronous judgment module, judging that the synchronous signal arrives and determining the occurrence position of data bits in each message data according to the synchronous signal, extracting baseband message data, and delivering the baseband message data to an RS coding module for coding processing, and meanwhile judging the message type of the baseband message data according to the type of a synchronous head;
when the RS coding module is used for coding, three coding algorithms of RS (30,18), RS (48,34) and RS (92,72) are adopted, when the message type is an FIS-B message, the message is recombined according to ((symbol 1, symbol 7, symbol 13, symbol 19, … symbol 547), (symbol 2, symbol 8, symbol 14, symbol 20, … symbol 548), … (symbol 6, symbol 12, symbol 18, symbol 24, … symbol 552)), and then the RS (92,72) is used for coding for 6 times, so that the message of the FIS-B is longer, and three encoders are adopted to work at the same time; when the message type is not a FIS-B message, then the message is encoded using RS (30,18) and RS (48, 34);
the encoding with RS (30,18) is G (2)m) The iterative operation circuit completes BM iterative operation under the action of the system time sequence and coding type control circuit G (2)m) The input of the iterative operation circuit is an original baseband code element sequence, each iterative process is completed according to the beat under the drive of a system clock, and the verified original baseband code element sequence is output according to the beat. G (2)m) The start and stop of the iterative operation circuit are controlled by a system timing and coding type control circuit, wherein m = 8.
The specific process of obtaining the synchronous signal through the ADS-B message coding unit is as follows: and processing the original baseband code element sequence in the position information by a synchronization judging module to detect a synchronization signal.
In conclusion, the invention has the following beneficial effects: the device can realize full airspace transmission in the range covered by the Beidou satellite, so that only one Beidou ground command center for receiving the message information needs to be built, the coverage of no blind area and full airspace in the Asia-Pacific region can be realized at present, the global coverage of the Beidou can be realized in the future, the device can realize the global non-blind area coverage, meanwhile, the message is transmitted by utilizing the matching of the PPS time slot and the local random time slot, the transmission interference is avoided, and meanwhile, the RS coding is realized by utilizing a good message coding mode.
Drawings
FIG. 1 is a schematic diagram of the system architecture of the present invention.
Fig. 2 is a schematic structural diagram of an RS encoding module.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited to these examples.
Example 1:
as shown in figures 1 and 2 of the drawings,
the aircraft signal transmission system comprises a BDS antenna for receiving satellite navigation information, a BDS unit connected with the BDS antenna, an ADS-B interface unit connected with the BDS unit, an ADS-B message coding unit connected with the ADS-B interface unit, a UAT radio frequency transmitting unit and a Beidou transmitting unit, wherein the UAT radio frequency transmitting unit and the Beidou transmitting unit are connected with the ADS-B message coding unit.
According to the invention, a Beidou airborne ADS-B transmitter is researched, Beidou is selected as a GNSS navigation source of the system, a data chain of the GNSS navigation source supports the dual modes of a traditional UAT data link and a Beidou short message communication link, the device encodes ADS-B messages according to ADS-B, transmits the ADS-B messages on the UAT link of the ADS-B, and transmits the ADS-B messages on the Beidou short message data link, so that a double-link parallel transmission mechanism is realized. And the UAT link of the ADS-B is a UAT radio frequency transmitting unit, and the Beidou short message data link is a Beidou transmitting unit.
In airport terminal area, ADS-B ground receiving station in airport can receive ADS-B message broadcasted by the equipment on UAT link according to 1/s, in the remote navigation area, especially the area which cannot be covered by ADS-B ground station, the equipment continues to transmit ADS-B messages by using the Beidou short messages at a lower frequency (1-5 times/minute) for receiving by the Beidou ground command center, and as the messages are broadcast by the satellite, therefore, the link is not influenced by the distance, and the full airspace transmission can be realized in the range covered by the Beidou satellite, so that only one Beidou ground command center for receiving the message information needs to be built, the coverage of no blind area and full airspace in the Asia-Pacific region can be realized at present, and in the future, with the global coverage of the Beidou, the equipment can realize the global coverage without the blind area.
Preferably, the BDS unit includes a baseband unit a and an interface unit a connected to the baseband unit a, the ADS-B interface unit includes an interface unit B and an NIC check module connected to the interface unit B, the interface unit a is connected to the NIC check module through the interface unit B, and the NIC check module is connected to the ADS-B message encoding unit. And finishing baseband processing through the BDS unit and finishing verification of the positioning information through the ADS-B interface unit.
The Beidou antenna receives position information from a satellite, the position information is sent to the ADS-B interface unit through a fracture in the outer part and an RS232 interface after baseband processing, and the position information is sent to the ADS-B message coding unit after verification through an NIC (navigation integrity verification) module.
The ADS-B message coding unit comprises a synchronous judgment module connected with the NIC check module, the synchronous judgment module is connected with an RS coding module, the RS coding module is connected with a CRC24 check module, the CRC24 check module is connected with a buffer memory, the ADS-B message coding unit further comprises a local time slot unit and an ADS-B sending control module, and the ADS-B sending control module is connected with the NIC check module, the local time slot unit and the buffer memory.
Through the structure, the positioning information sending is controlled, a proper sending gap is selected so that the positioning information can be sent to other equipment, the ADS-B message coding unit codes the position information, and after the coding is completed, coded message information is formed, the coded message information cannot be sent out at the moment, the coded message information is sent out after the local time slot generated by the local time slot unit is utilized, the PPS time slot of the positioning information is utilized, the ADS-B sending control module judges that the local time slot is consistent with the PPS time slot, and therefore the sending time slot is generated by utilizing the rising edge of the external BDS synchronizing signal PPS.
The Beidou transmitting unit comprises a baseband unit B, a radio frequency unit connected with the baseband unit B, a BDS antenna connected with the radio frequency unit, and an SIM connected with the baseband unit B, wherein the baseband unit B is connected with a buffer memory. In a Beidou transmitting unit (Beidou short message transmitting unit), coded message information (ADS-B messages) is input into a Beidou message communication unit, and the messages are sent to a Beidou command center through a satellite link through a Beidou subscriber card.
The UAT radio frequency transmitting unit comprises CPFSK modulation, prevention connected with the CPFSK modulation, a power amplifier connected with the prevention, a 978MHz antenna connected with the power amplifier, a frequency mixing connected with the CPFSK modulation, and a local oscillator connected with the frequency mixing, wherein the CPFSK modulation is connected with a buffer memory. In the UAT radio frequency transmitting unit, the coded message information (ADS-B message) is subjected to local oscillation, frequency mixing, CPFSK modulation, preamplification, pushing and power amplification and then radio frequency broadcasting at 978MHZ frequency.
Preferably, the invention uses the RS coding module to perform coding processing, the RS coding module comprises a synchronous judgment module receiving unit connected with the synchronous judgment module, the synchronous judgment module receiving unit is connected with a Block RAM, a system time sequence and coding type control circuit, a register group s, a register group w, a register group b, and G (2)m) The output ends of the operation circuit, the register group s, the register group w and the register group b are all connected with G (2)m) Operational circuit connection, G (2)m) The output end of the operational circuit is connected with the input ends of the register group s, the register group w and the register group b, the operational circuit further comprises a MUX, the output end of the Block RAM (random Access memory), the output end of the system timing and coding type control circuit and the output end of the register group s are connected with the MUX (multiplexer), and the MUX is further connected with a message decoderThe analysis unit is connected with a message type indication end of the system time sequence and coding type control circuit, and comprises a Block RAM, a register group s, a register group w, a register group b and a register group G (2)m) The arithmetic circuit is controlled by a system time sequence and coding type control circuit, and the message analysis unit is connected with the CRC24 check module.
Detecting a synchronous signal by processing an original baseband code element sequence in the position information through a synchronous judgment module, judging that the synchronous signal arrives and determining the occurrence position of data bits in each message data according to the synchronous signal, extracting baseband message data, and delivering the baseband message data to an RS coding module for coding processing, and meanwhile judging the message type of the baseband message data according to the type of a synchronous head;
and the synchronous judging module judges the message type.
The system time sequence and coding type control circuit controls the coding paths of data of different message types corresponding to the present day.
When the message type is a FIS-B message, encoding for 6 times by using the RS (92, 72); and the MUX, the Block RAM (random access memory), the system timing and coding type control circuit complete RS (92,72) coding.
When the message type is not a FIS-B message, then the message is encoded using RS (30,18) and RS (48,34), wherein the system timing and encoding type control circuit, register set s, register set w, register set B, and G (2)m) The operation circuit group completes the RS (30,18) coding algorithm.
As shown in fig. 2, the RS encoding module performs coordinate encoding, call sign encoding, ICAO address encoding, model encoding, transmitter type encoding, altitude encoding, and the like.
Example 2
As shown in figures 1 and 2 of the drawings,
the signal transmission method based on the aircraft signal transmission system comprises the following steps:
receiving satellite navigation information through a BDS antenna;
the BDS unit processes the satellite navigation information through a baseband to obtain position information and a PPS time slot;
navigation integrity verification is carried out on the position information and the PPS time slot through an ADS-B interface unit, and the verified position information and the PPS time slot are sent to an ADS-B message coding unit;
the ADS-B message coding unit codes the position information according to the ADS-B message coding rule to obtain coded message information, a local time slot is randomly generated, the ADS-B message coding unit obtains a synchronous signal, when the current synchronous signal arrives, the consistency of the local time slot and the PPS time slot is judged, and when the local time slot and the PPS time slot are consistent, the coded message information is triggered to be sent to the UAT radio frequency transmitting unit and the Beidou transmitting unit.
The specific process of obtaining the coded message information by coding the position information by the ADS-B message coding unit according to the ADS-B message coding rule comprises the following steps:
detecting a synchronous signal by processing an original baseband code element sequence in the position information through a synchronous judgment module, judging that the synchronous signal arrives and determining the occurrence position of data bits in each message data according to the synchronous signal, extracting baseband message data, and delivering the baseband message data to an RS coding module for coding processing, and meanwhile judging the message type of the baseband message data according to the type of a synchronous head;
when the RS coding module is used for coding, three coding algorithms of RS (30,18), RS (48,34) and RS (92,72) are adopted, when the message type is an FIS-B message, the message is recombined according to ((symbol 1, symbol 7, symbol 13, symbol 19, … symbol 547), (symbol 2, symbol 8, symbol 14, symbol 20, … symbol 548), … (symbol 6, symbol 12, symbol 18, symbol 24, … symbol 552)) and then is coded for 6 times by using RS (92, 72); when the message type is not a FIS-B message, then the message is encoded using RS (30,18) and RS (48, 34);
the encoding with RS (30,18) is G (2)m) The iterative operation circuit completes BM iterative operation under the action of the system time sequence and coding type control circuit G (2)m) The input of the iterative operation circuit is an original baseband code element sequence, each iterative process is completed according to the beat under the drive of a system clock, and the verified original baseband code element sequence is output according to the beat。G（2m) The start and stop of the iterative operation circuit are controlled by a system timing and coding type control circuit, wherein m = 8.
The specific process of obtaining the synchronous signal through the ADS-B message coding unit is as follows: and processing the original baseband code element sequence in the position information by a synchronization judging module to detect a synchronization signal.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (8)
1. Aircraft signal transmission system, its characterized in that: the satellite navigation system comprises a BDS antenna for receiving satellite navigation information, a BDS unit connected with the BDS antenna, an ADS-B interface unit connected with the BDS unit, an ADS-B message coding unit connected with the ADS-B interface unit, a UAT radio frequency transmitting unit and a Beidou transmitting unit, wherein the UAT radio frequency transmitting unit and the Beidou transmitting unit are connected with the ADS-B message coding unit;
the ADS-B message coding unit comprises a synchronous judgment module connected with the NIC check module, the synchronous judgment module is connected with an RS coding module, and the RS coding module is connected with a CRC24 check module;
the RS coding module comprises a synchronous judgment module receiving unit connected with the synchronous judgment module, the synchronous judgment module receiving unit is connected with a Block RAM, a system time sequence and coding type control circuit, a register group s, a register group w, a register group b and a G (2)m) The output ends of the operation circuit, the register group s, the register group w and the register group b are all connected with G (2)m) Operational circuit connection, G (2)m) The output end of the arithmetic circuit is connected with the input ends of the register group s, the register group w and the register group b, the output end of the Block RAM, the output end of the system time sequence and coding type control circuit and the output end of the register group s are all connected with the MUX, the MUX is also connected with a message analysis unit, the message type indication end of the system time sequence and coding type control circuit is connected with the message analysis unit, and the Block RAM, the register group s, the register group w and the register group are connected with the message analysis unitb、G（2m) The arithmetic circuit is controlled by a system time sequence and coding type control circuit, and the message analysis unit is connected with the CRC24 check module.
2. The aircraft signal transmission system of claim 1, wherein: the BDS unit comprises a baseband unit A and an interface unit A connected with the baseband unit A, the ADS-B interface unit comprises an interface unit B and an NIC (network interface card) verification module connected with the interface unit B, the interface unit A is connected with the NIC verification module through the interface unit B, and the NIC verification module is connected to the ADS-B message coding unit.
3. The aircraft signal transmission system of claim 2, wherein: the CRC24 checking module is connected with a buffer memory, and also comprises a local time slot unit and an ADS-B sending control module, wherein the ADS-B sending control module is connected with the NIC checking module, the local time slot unit and the buffer memory.
4. The aircraft signal transmission system of claim 3, wherein: the Beidou transmitting unit comprises a baseband unit B, a radio frequency unit connected with the baseband unit B, a BDS antenna connected with the radio frequency unit, and an SIM connected with the baseband unit B, wherein the baseband unit B is connected with a buffer memory.
5. The aircraft signal transmission system of claim 3, wherein: the UAT radio frequency transmitting unit comprises CPFSK modulation, pre-amplification connected with the CPFSK modulation, a power amplifier connected with the pre-amplification, a 978MHz antenna connected with the power amplifier, a frequency mixing connected with the CPFSK modulation, a local oscillator connected with the frequency mixing, and a CPFSK modulation and buffer memory.
6. Signal transmission method for an aircraft signal transmission system according to any one of claims 1 to 5, characterized in that: the method comprises the following steps:
receiving satellite navigation information through a BDS antenna;
the BDS unit processes the satellite navigation information through a baseband to obtain position information and a PPS time slot;
navigation integrity verification is carried out on the position information and the PPS time slot through an ADS-B interface unit, and the verified position information and the PPS time slot are sent to an ADS-B message coding unit;
the ADS-B message coding unit codes the position information according to the ADS-B message coding rule to obtain coded message information, a local time slot is randomly generated, the ADS-B message coding unit obtains a synchronous signal, when the current synchronous signal arrives, the consistency of the local time slot and the PPS time slot is judged, and when the local time slot and the PPS time slot are consistent, the coded message information is triggered to be sent to the UAT radio frequency transmitting unit and the Beidou transmitting unit.
7. The signal transmission method of an aircraft signal transmission system according to claim 6, characterized in that: the specific process of obtaining the coded message information by coding the position information by the ADS-B message coding unit according to the ADS-B message coding rule comprises the following steps:
detecting a synchronous signal by processing an original baseband code element sequence in the position information through a synchronous judgment module, judging that the synchronous signal arrives and determining the occurrence position of data bits in each message data according to the synchronous signal, extracting baseband message data, and delivering the baseband message data to an RS coding module for coding processing, and meanwhile judging the message type of the baseband message data according to the type of a synchronous head;
when the RS coding module is used for coding, three coding algorithms of RS (30,18), RS (48,34) and RS (92,72) are adopted, when the message type is an FIS-B message, the message is recombined according to 'symbol 1, symbol 7, symbol 13, symbol 19, … symbol 547', 'symbol 2, symbol 8, symbol 14, symbol 20, … symbol 548', … 'symbol 6, symbol 12, symbol 18, symbol 24, … symbol 552', and then is coded for 6 times by using RS (92, 72); when the message type is not a FIS-B message, then the message is encoded using RS (30,18) and RS (48, 34);
the encoding with RS (30,18) is G (2)m) Iterative operation circuit in system time sequence and coding typeBM iterative operation is completed under the action of control circuit G (2)m) The input of the iterative operation circuit is an original baseband code element sequence, each iterative process is completed according to the beat under the drive of a system clock, and the verified original baseband code element sequence is output according to the beat;
G（2m) The start and stop of the iterative operation circuit are controlled by a system timing and coding type control circuit, wherein m = 8.
8. The signal transmission method of an aircraft signal transmission system according to claim 6, characterized in that: the specific process of obtaining the synchronous signal through the ADS-B message coding unit is as follows: and processing the original baseband code element sequence in the position information by a synchronization judging module to detect a synchronization signal.
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| CN109905161A (en) * | 2017-12-08 | 2019-06-18 | 中电科特种飞机系统工程有限公司 | A kind of data transmission system, method and the medium of portable ADS-B |
| CN108134654A (en) * | 2017-12-25 | 2018-06-08 | 四川九洲空管科技有限责任公司 | A kind of method and device for improving ultra-long data report transmission reliability |
| CN108574565B (en) * | 2018-04-25 | 2024-05-31 | 四川省安道速博科技有限公司 | Signal quality detection device and method for S-mode transmitter |
| CN113218250A (en) * | 2021-03-05 | 2021-08-06 | 山东中泰新能源集团有限公司 | Method and facility for protecting safety of air-raid shelter |
| CN116405976B (en) * | 2023-06-06 | 2023-09-22 | 中国民用航空飞行学院 | ADS-B-based data bidirectional communication optimization method and system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102621567A (en) * | 2012-03-28 | 2012-08-01 | 上海埃威航空电子有限公司 | Automatic dependent surveillance-broadcast (ADS-B) airborne equipment with beidou function and beidou function starting and stopping method |
| CN104756408A (en) * | 2012-10-18 | 2015-07-01 | 三菱电机株式会社 | Communication terminal, communication method, program, and communication system |
| CN205029906U (en) * | 2015-04-28 | 2016-02-10 | 赛尔富电子有限公司 | Control system , lighting system |
| CN105629271A (en) * | 2015-12-28 | 2016-06-01 | 重庆九洲星熠导航设备有限公司 | Beidou dual-mode terminal equipment based on navigation ADS-B application and control method thereof |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2347828B (en) * | 1999-03-05 | 2004-05-19 | Internat Mobile Satellite Orga | Communication methods and apparatus |
| GB2347824B (en) * | 1999-03-05 | 2004-03-03 | Internat Mobile Satellite Orga | Communication methods and apparatus |
| US7634231B2 (en) * | 2004-02-26 | 2009-12-15 | Vtech Telecommunications Limited | System and method for enhanced interoperability between a plurality of communication devices |
| US11073622B2 (en) * | 2014-02-26 | 2021-07-27 | Pnt Holdings, Inc. | Performance and cost global navigation satellite system architecture |
-
2016
- 2016-08-02 CN CN201610622976.1A patent/CN106059653B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102621567A (en) * | 2012-03-28 | 2012-08-01 | 上海埃威航空电子有限公司 | Automatic dependent surveillance-broadcast (ADS-B) airborne equipment with beidou function and beidou function starting and stopping method |
| CN104756408A (en) * | 2012-10-18 | 2015-07-01 | 三菱电机株式会社 | Communication terminal, communication method, program, and communication system |
| CN205029906U (en) * | 2015-04-28 | 2016-02-10 | 赛尔富电子有限公司 | Control system , lighting system |
| CN105629271A (en) * | 2015-12-28 | 2016-06-01 | 重庆九洲星熠导航设备有限公司 | Beidou dual-mode terminal equipment based on navigation ADS-B application and control method thereof |
Non-Patent Citations (5)
| Title |
|---|
| Evaluation method for node importance based on node condensation in terrorism networks;Ben-xian Li 等;《2012 IEEE International Conference on Intelligence and Security Informatics》;20120827;全文 * |
| UAT ADS-B信息传输与抗干扰技术研究;张德银 等;《2013年中国通用航空发展论坛论文集》;20130912;全文 * |
| 基于BDS/GPS的ADS-B信号源的研究;张鹏 等;《测控技术》;20150131;第34卷(第1期);第12-19页 * |
| 基于测向天线的ADS-B信息校验技术研究;林琳 等;《微型机与应用》;20140831;第33卷(第8期);全文 * |
| 广播式自动相关监视机载发射组件的设计与实现;王涛 等;《现代导航》;20150630(第6期);全文 * |
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