CN205405927U - Airborne equipment based on big dipper satellite navigation - Google Patents

Airborne equipment based on big dipper satellite navigation Download PDF

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Publication number
CN205405927U
CN205405927U CN201620159312.1U CN201620159312U CN205405927U CN 205405927 U CN205405927 U CN 205405927U CN 201620159312 U CN201620159312 U CN 201620159312U CN 205405927 U CN205405927 U CN 205405927U
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China
Prior art keywords
airborne
big dipper
signal
information
data
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CN201620159312.1U
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张劲松
孙力
赵洪超
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Beijing Ying Ying Oriental Polytron Technologies Inc
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Beijing Yingxiang Dongfang Technology Development Co Ltd
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Abstract

The utility model provides an airborne equipment based on big dipper satellite navigation, include: big dipper machine carries the subscriber computer, and the machine carries navigation information processing machine and passenger cabin traffic information display, big dipper machine carries the subscriber computer for receiving and sending big dipper communications and information, the machine carries navigation information processing machine for the navigation information data are carried with the combination processor to the encoding and decoding task of accomplishing airborne vehicle big dipper information, passenger cabin traffic information display for information display and control provide man -machine interface for the pilot, big dipper machine carries the subscriber computer and further includes antenna and host computer.

Description

A kind of airborne equipment based on Beidou satellite navigation
Technical field
This utility model belongs to subhost mounted terminal technical field, is specifically related to a kind of airborne equipment based on Beidou satellite navigation.
Background technology
Along with developing rapidly of China's Aviation Industry; C919 airliner, ARJ21 turbofan secondary-line-aircraft, Xinzhou 60 whirlpool oar secondary-line-aircraft, H425 helicopter, the fortune type aircraft such as 12 general-purpose aircrafts, straight 15 Medium Helicopters continue to bring out; especially as deepening continuously of China's low altitude airspace administrative reform; the fast development day by day of General Aviation market; the serious reality technology problems such as the airborne vehicle of low altitude flight often faces communication failure in flight course, it is inaccurate to navigate, to monitor blind area big, are also the airborne equipment technology subject matter faced of current international airline interface.
Summary of the invention
For overcoming above-mentioned the deficiencies in the prior art, this utility model provides a kind of airborne equipment based on Beidou satellite navigation, including:
The airborne subscriber computer of the Big Dipper, airborne sail information datatron and cockpit traffic information display;
The airborne subscriber computer of the described Big Dipper, is used for receiving and send Beidou communication information;
Described airborne sail information datatron, has been used for encoding and decoding task and the airborne navigation information data of combined treatment of airborne vehicle Big Dipper information;
Described cockpit traffic information display, shows for information and controls, providing human-computer interaction interface for pilot.
Preferably, the airborne subscriber computer of the described Big Dipper includes antenna and main frame;
Described antenna farther includes:
Power amplifier, for being amplified to the high power levels required for long-distance transmissions in tranmitting frequency by low level signal;
Emission filter, for filtering the band stray signal exported in signal of power amplifier;
Duplexer, farther includes the Big Dipper and receives LNA unit, emission controlling unit and conjunction road processing unit;
The described Big Dipper receives LNA unit, does radio-frequency front-end process for the Big Dipper receives small-signal;
Emission controlling unit, for controlling Big Dipper emission power amplifier;
Described conjunction road processing unit, launches signal synthesize for the Big Dipper receives small-signal and the Big Dipper.
Preferably, described main frame farther includes converter module, signal processing module signal, message processing module and power module;
Described converter module includes launching channel and receiving channel, has been used for up/down frequency conversion, gain balance, intermediate frequency filtering;
Signal processing module, the carrying out of the simulation low intermediate frequency signal for converter module is sent here is sampled, and simulation low intermediate frequency signal is transformed to time discrete digital signal;Complete catching to received signal, follow the tracks of, navigation message demodulation, time difference measurement;The transmission base band data that message processing module is sent here carries out spread processing, and the data after spread spectrum are sent converter module, produces modulated spread spectrum signal;
Described message processing module is used for processing reception data;Described process includes but not limited to the extraction to information such as broadcast, public, communications, it is achieved user authorizes;
Described power module, is used for powering.
Preferably, described message processing module is also responsible for outside Interface status is detected in real time, after effective order being detected, the order received is made an explanation, performs corresponding operation.
Preferably, described in effective order detected after the order received is made an explanation, perform corresponding operation, particularly as follows: if the related command launched, then according to check-in signal form framing, give signal processing module after authentication.
Preferably, power module also includes electromagnetic interface filter.
Preferably, described airborne sail information datatron farther includes For Embedded Computer On Modules, memory module, interface processing module, power source protective module;
Described For Embedded Computer On Modules, is used for realizing:
1) ADS-C packet parsing function
Receive, from the airborne subscriber computer of the Big Dipper, the ADS-C contract message that ground air traffic control system sends, message is resolved, and carries out automatic-answering back device according to fixing contract form;
2) ADS-C message assembles function
Receive position data from the airborne subscriber computer of the Big Dipper, and data are carried out analytical Calculation, be then packaged into ADS-C contract message, be sent to the airborne subscriber computer of the Big Dipper thus the energy that realizes passing on Gong under ADS-C message according to setting frequency;
3) CPDLC packet parsing function
Receive the CPDLC message information from the airborne subscriber computer of the Big Dipper, and message is carried out dissection process, then send cockpit traffic information display to display;
4) CPDLC message assembles function
Receive breath of delivering a letter under pilot's response or active of cockpit traffic information display, and this information form according to the rules is assembled into CPDLC downlink message, then message is sent to the airborne subscriber computer of the Big Dipper, thus the energy that realizes passing on Gong under CPDLC message;
Described memory module, the various data used for depositing information process to need;
Described interface processing module, comprises 5 serial ports, has the FIFO of 64Bytes, and serial port baud rate is adjustable, reaches as high as 115.2Kbps;From external reception Big Dipper transceiving data;Airborne ins signal;Pressure altitude signal;Cockpit display data and loading and detection data;
Described power source protective module, is drawn by unified plug, on configuration power-supply filter, power panel to male connector all with the plugs and sockets of locking mechanism, to ensure that patch plug is solid and reliable.
Preferably, airborne sail information processor pair external tapping includes:
With the RS-422 interface that the airborne subscriber computer of the Big Dipper carries out data crosslinking;RS-422 interface with the crosslinking of cockpit traffic display;The RS-232 interface loaded for data and detect;Carrier aircraft power interface;Standby RS-422 interface: the airborne navigation data source of combined treatment.
Preferably, described cockpit traffic information display has three external interfaces of USB, RS-232 and RS-422, is carried out data loading and output by RS-232, is cross-linked by RS-422 interface and airborne sail information datatron;Cockpit traffic display and the crosslinking of airborne sail information datatron, receive the data that airborne sail information datatron transmits, provide the CPDLC human-computer interaction interface applied for pilot and ground crew.
Preferably, described cockpit traffic information display receives status information and the CPDLC message information displaying that airborne sail information datatron sends, and provides for pilot and carries out the human-computer interaction interface of CPDLC message interaction with ground system, it is achieved:
(1) CPDLC message shows and sends request function
The CPDLC message information that cockpit traffic information display is responsible for that airborne processor is forwarded carries out resolving display, is responsible for pilot simultaneously and provides the operation interface for CPDLC message editing and response;
(2) system maintenance function
Cockpit traffic information display receives the status information that airborne sail information datatron is sent, then in conjunction with oneself state information, application interface provides the duty prompting of Big Dipper airborne version subscriber computer, airborne sail information datatron and cockpit traffic display in real time;Simultaneously cockpit traffic information display also has parameter and arranges management function, including: management information injections, the derivation of prefabricated free message, data.
Described above is only the general introduction of technical solutions of the utility model, in order to better understand technological means of the present utility model, and can be practiced according to the content of description, below with preferred embodiment of the present utility model and coordinate accompanying drawing describe in detail as after.
Accompanying drawing explanation
Fig. 1 illustrates the blank pipe emergency management and rescue Beidou communication navigation integral system according to an embodiment of the present utility model;
Fig. 2 illustrates the block diagram of the airborne equipment based on Beidou satellite navigation according to an embodiment of the present utility model;
Fig. 3 illustrates the airborne subscriber computer composition frame chart of the Big Dipper according to an embodiment of the present utility model;
Fig. 4 illustrates the composition frame chart recording sail information datatron according to an embodiment of the present utility model;
Fig. 5 illustrates the cockpit traffic information display composition frame chart according to an embodiment of the present utility model;
Fig. 6 illustrates the block diagram of the surface-monitoring equipment according to an embodiment of the present utility model;
Fig. 7 illustrates the theory diagram of the integrated radio-frequency module according to an embodiment of the present utility model;
Fig. 8-1 to 8-3 respectively illustrates the simulation figure of quantization threshold and the snr loss adopting 3 bits, 2 bits and 1.5 bit dynamic quantizations;
Fig. 9 illustrates the theory diagram combining anti-fading/low-power consumption front end according to an embodiment of the present utility model;
Figure 10 illustrates the signal flow graph of the signal-to-noise ratio (SNR) estimation according to an embodiment of the present utility model;
Figure 11 illustrates the single cable multi signal transmission schematic diagram according to an embodiment of the present utility model.
Detailed description of the invention
For further setting forth that this utility model is reach technological means and effect that predetermined utility model purpose is taked, below in conjunction with accompanying drawing and preferred embodiment, to according to its detailed description of the invention of big-dipper satellite Airborne Terminal, feature and the effect thereof that the utility model proposes, describe in detail as after.In the following description, what different " embodiments " or " embodiment " referred to is not necessarily same embodiment.Additionally, special characteristic in one or more embodiment, structure or feature can be combined by any suitable form.
In a detailed description of the invention of the present utility model,
As it is shown in figure 1, blank pipe emergency management and rescue Beidou communication navigation integral system includes Beidou communication navigation integration airborne equipment and surface-monitoring equipment;
Described surface-monitoring equipment, for receiving the information of the airborne equipment based on Beidou satellite navigation;Aircraft position message and pilot's note message that airborne equipment based on Beidou satellite navigation is sent process, and generate empty mood gesture;Generate earth-space communication and monitor information;
The described airborne equipment based on Beidou satellite navigation, is used for providing automatic dependent surveillance (ADS);Controller communicates (CPDLC) with Pilot Data's chain;And assisting navigation.
According to a detailed description of the invention of the present utility model, described automatic dependent surveillance (ADS) refers to, sets up communication channel for airborne vehicle with ground air traffic control system and links, the information such as real-time exchange airborne vehicle air position, regulatory service.
According to a detailed description of the invention of the present utility model, described controller communicates with Pilot Data's chain, and (CPDLC) to refer to that controller and pilot carry out blank pipe information by digital short message mutual.
According to a detailed description of the invention of the present utility model, after described assisting navigation refers to that Airborne Terminal utilizes self poisoning information to export information fusion with aircraft onboard navigation, it is provided that assisting navigation service.
As in figure 2 it is shown, the described airborne equipment based on Beidou satellite navigation includes: the airborne subscriber computer of the Big Dipper, airborne sail information datatron and cockpit traffic information display;
The airborne subscriber computer of the described Big Dipper, is used for receiving and send Beidou communication information;
Described airborne sail information datatron, has been used for encoding and decoding task and the airborne navigation information data of combined treatment of airborne vehicle Big Dipper information;
Described cockpit traffic information display, shows for information and controls, providing human-computer interaction interface for pilot.
Based on the airborne equipment power switch design of Beidou satellite navigation on passenger cabin traffic information diaplay device, when monitor switch closes, to the airborne subscriber computer of the Big Dipper and one ground signalling of airborne sail information datatron, the airborne subscriber computer of the Big Dipper and airborne sail information datatron receive Auto Power On after ground signalling, airborne sail information datatron start backward cockpit traffic information display output 12V voltage, cockpit traffic information display starts after powering on automatically, enters application interface.
As it is shown on figure 3, the airborne subscriber computer of the described Big Dipper includes antenna and main frame;
Described antenna farther includes:
Power amplifier, for being amplified to the high power levels required for long-distance transmissions in tranmitting frequency by low level signal;
Emission filter, for filtering the band stray signal exported in signal of power amplifier;
Duplexer, farther includes the Big Dipper and receives LNA unit, emission controlling unit and conjunction road processing unit;
The described Big Dipper receives LNA unit, does radio-frequency front-end process for the Big Dipper receives small-signal;
Emission controlling unit, for controlling Big Dipper emission power amplifier;
Described conjunction road processing unit, launches signal synthesize for the Big Dipper receives small-signal and the Big Dipper;
Described main frame farther includes converter module, signal processing module signal, message processing module and power module;
Described converter module includes launching channel and receiving channel, has been used for up/down frequency conversion, gain balance, intermediate frequency filtering;
Signal processing module, the carrying out of the simulation low intermediate frequency signal for converter module is sent here is sampled, and simulation low intermediate frequency signal is transformed to time discrete digital signal;Complete catching to received signal, follow the tracks of, navigation message demodulation, time difference measurement;The transmission base band data that message processing module is sent here carries out spread processing, and the data after spread spectrum are sent converter module, produces modulated spread spectrum signal;
According to a preferred implementation of the present utility model, described signal processing module is provided with 6 parallel reception passages and a transmission channel.Receive 6 departures wave beams that passage receives three " Big Dipper one " satellites (east star, western star, backup star) of system respectively.The transmission base band data that message processing module is sent here by transmission channel carries out spread processing, and the data after spread spectrum are sent converter module, and 1615.68MHz carrier wave is modulated, and produces modulated spread spectrum signal.
According to a preferred implementation of the present utility model, in order to improve certainty of measurement, signal processing module adopts photocarrier method code ring to follow the tracks of, so that code ring can accurately reflect, follow the tracks of Dynamic Signal, improves the dynamic property following the tracks of ring.
Described message processing module has been used for the process (extraction as to information such as broadcast, public, communications) to six channel reception data, it is achieved user authorizes.
According to a preferred implementation of the present utility model, described message processing module is also responsible for outside Interface status is detected in real time, after effective order being detected, the order received is made an explanation, performs corresponding operation.If the related command launched, then according to check-in signal form framing, after authentication, give signal processing module.
Described power module provides effective reliable various voltages by modules such as DC/DC conversion module group are converter module, signal processing, information processing.Each road voltage is all by independent DC/DC chip output, it is possible to the different electric pressure of each module conveying and the second best in quality power supply of power demand, it is ensured that the work that complete machine is reliable and stable.
According to a preferred implementation of the present utility model, power module also includes electromagnetic interface filter, well solves the electromagnetic compatibility problem between equipment and system so that equipment and system do not interfere with each other.
According to a preferred implementation of the present utility model, " Big Dipper one " S-band exit signal that satellite is broadcast, arrive first at the antenna part of the airborne subscriber computer of the Big Dipper, the Big Dipper airborne subscriber computer antenna collected small-signal is delivered to reception channel.Receive channel the small-signal of antenna feed is amplified, down coversion, finally export intermediate-freuqncy signal, and intermediate-freuqncy signal is delivered to signal processing module process.
Signal processing module passes through A/D converting unit, and the intermediate-freuqncy signal that reception channel is sent here carries out sample quantization, and the digital sample values of output exit signal, for follow-up reception cell processing.
Receive unit and include six reception passages (each passage includes: follow the tracks of despread unit, symbol demodulation unit and information decoding unit three part), be responsible for the I branch road to the exit signal that " Big Dipper one " satellite forwards and be tracked despreading, symbol demodulation and information decoding respectively.Follow the tracks of despread unit and carry out Code acquisition, code tracking and despreading to signals selected, carry out judging whether Q tributary signal is de-spread according to the I branch road information received simultaneously.Digital signal after despreading gives symbol demodulation cell processing.The symbol demodulation unit I branch road despread signal to input, first carries out frequency deviation estimation, frequency deviation offsets, then precision tracking carrier phase and symbol demodulation;Equally, when necessary the symbol of Q branch road being demodulated simultaneously, the value of symbol demodulated delivers to information decoding unit after three bit quantizations.Three bit quantization numerals of the I branch road (if desired Q branch road) of input are carried out Viterbi Soft decision decoding by information decoding unit, and the information data obtained is delivered to message processing module.
Message processing module is used for controlling co-ordination between each unit, the process of six channel reception data can be completed, including the extraction of information such as communicating, position, broadcast, be public, and by encryption/decryption module (IC-card or security chip) is operated, complete the deciphering to reception data.Message processing module is also responsible for outside interface data is detected in real time, after effective order being detected, performs corresponding operation, will perform result simultaneously and return.
If message processing module receives communication application etc. launches related command, then generate corresponding text according to check-in signal form, and encryption/decryption module is delivered in text be encrypted, and give signal processing module by the text after encryption, this text is carried out spread spectrum by signal processing module, and gives converter with the form of baseband signal, converter is modulate baseband information to transmitting carrier wave, and give power amplifier launching signal, after power amplification, transmitting antenna it is transmitted to satellite.
As shown in Figure 4, described airborne sail information datatron farther includes For Embedded Computer On Modules, memory module, interface processing module, power source protective module;
Described For Embedded Computer On Modules, is used for realizing:
1) ADS-C packet parsing function
Receive, from the airborne subscriber computer of the Big Dipper, the ADS-C contract message that ground air traffic control system sends, message is resolved, and carries out automatic-answering back device according to fixing contract form;
2) ADS-C message assembles function
Receive position data from the airborne subscriber computer of the Big Dipper, and data are carried out analytical Calculation, be then packaged into ADS-C contract message, be sent to the airborne subscriber computer of the Big Dipper thus the energy that realizes passing on Gong under ADS-C message according to setting frequency;
3) CPDLC packet parsing function
Receive the CPDLC message information from the airborne subscriber computer of the Big Dipper, and message is carried out dissection process, then send cockpit traffic information display to display;
4) CPDLC message assembles function
Receive breath of delivering a letter under pilot's response or active of cockpit traffic information display, and this information form according to the rules is assembled into CPDLC downlink message, then message is sent to the airborne subscriber computer of the Big Dipper, thus the energy that realizes passing on Gong under CPDLC message;
Described memory module, the various data used for depositing information process to need;
Described interface processing module, comprises 5 serial ports, has the FIFO of 64Bytes, and serial port baud rate is adjustable, reaches as high as 115.2Kbps;From external reception Big Dipper transceiving data;Airborne ins signal;Pressure altitude signal;Cockpit display data and loading and detection data;
Described power source protective module, is drawn by unified plug, on configuration power-supply filter, power panel to male connector all with the plugs and sockets of locking mechanism, to ensure that patch plug is solid and reliable.
According to a preferred implementation of the present utility model, power-supply filter selects to accept+16V~+36V input, and current value is the DC wave filter more than 1A.Power-supply filter directly connects firmly structurally, is directly fastened by screw.
System adopts single+5V to power, and board major part device operating voltages is+5V, core voltage 1.25V, and I/O voltage is 3.3V, accordingly, it would be desirable to power pack is carried out conscientiously careful planning.In this system, adopt dc-dc, stably export 1.25V, 2.5V and 3.3V, it is ensured that system power supply when regulation, can be stablized, work normally.
According to a detailed description of the invention of the present utility model, airborne sail information processor pair external tapping includes:
With the RS-422 interface that the airborne subscriber computer of the Big Dipper carries out data crosslinking;RS-422 interface with the crosslinking of cockpit traffic display;The RS-232 interface loaded for data and detect;Carrier aircraft power interface;Standby RS-422 interface: the airborne navigation data source of combined treatment.
As it is shown in figure 5, described cockpit traffic information display includes display module, processing module, memory module, interface processing module and power module.
Cockpit traffic information display is powered by sail information datatron, after the CPU module that powers on starts, operating system is entered through self-inspection flow processs such as a series of BIOS, internal memory and peripheral interfaces, application program is cross-linked by RS-422 interface and airborne sail information datatron, displays after the data parsing received.Cockpit traffic information display has three external interfaces of USB, RS-232 and RS-422, is carried out data loading and output by RS-232, is cross-linked by RS-422 interface and airborne sail information datatron.Cockpit traffic display and the crosslinking of airborne sail information datatron, receive the data that airborne sail information datatron transmits, provide the CPDLC human-computer interaction interface applied for pilot and ground crew.
Described cockpit traffic information display receives status information and the CPDLC message information displaying that airborne sail information datatron sends, and provides for pilot and carries out the human-computer interaction interface of CPDLC message interaction with ground system, it is possible to achieve:
(1) CPDLC message shows and sends request function
The CPDLC message information that cockpit traffic information display is responsible for that airborne processor is forwarded carries out resolving display, is responsible for pilot simultaneously and provides the operation interface for CPDLC message editing and response.
(2) system maintenance function
Cockpit traffic information display receives the status information that airborne sail information datatron is sent, then in conjunction with oneself state information, application interface provides the duty prompting of Big Dipper airborne version subscriber computer, airborne sail information datatron and cockpit traffic display in real time.Simultaneously cockpit traffic information display also has parameter and arranges management function, including: management information injection, prefabricated free message, data derivation etc..
The installing additional of airborne equipment based on Beidou satellite navigation, it is possible to the problem that ground air traffic control system monitoring capacity when solving blank pipe emergency management and rescue is not enough.
According to a detailed description of the invention of the present utility model, ground air traffic control system sends contract report as desired by Beidou communication function to task airborne vehicle, after the airborne subscriber computer of the Big Dipper receives the contract report that ground air traffic control system is sent, by data-interface, contract report information passed through airborne sail information datatron, airborne sail information datatron is reported according to contract format analysis contract, and packing response report information is automatically edited according to current practical situation, by data-interface to response report information sent the airborne subscriber computer of the Big Dipper, utilized Big Dipper generation short message communication function that response report is sent to ground air traffic control system by the airborne subscriber computer of the Big Dipper again.
According to a detailed description of the invention of the present utility model, controller and Pilot Data's chain communication are divided into uplink and the big class of descending chain two.Ground air traffic control system can send line command on CPDLC as desired by Big Dipper generation short message communication function to task airborne vehicle, after the airborne subscriber computer of the Big Dipper receives the order that ground air traffic control system is sent, pass through data-interface, the information received is passed through airborne sail information datatron, on airborne sail information processor pair, line command resolves, and send cockpit traffic information display to show the information after resolving.After pilot sees order, by cockpit traffic information display, response message is sent to airborne sail information datatron, response message editor is packed by airborne sail information datatron, and it is sent to the airborne subscriber computer of the Big Dipper, by the Big Dipper airborne subscriber computer, response message is sent to ground air traffic control system, same pilot also can send solicited message by active air traffic control system earthward, and waits the response of ground air traffic control system.
As shown in Figure 6, described surface-monitoring equipment includes: Big Dipper commander's subscriber computer, information processing access device, transmission multiple connection equipment and Big Dipper monitor workstation;
Described Big Dipper commander's subscriber computer, for positioning and receive and sending Beidou communication information;Arrange subordinate user's group and monitor subordinate user group down pass message and commander message upload broadcast;
Described information processing access device, for the ADS message passed down in the air being converted to the message format needed for Big Dipper ground monitoring work station, and deliver to Big Dipper commander's subscriber computer be uploaded to the airborne equipment based on Beidou satellite navigation by converting uplink message to from Big Dipper ground monitoring work station ground control's message;
Described transmission multiple connection equipment, forwards for information between information processing access device and Big Dipper monitor workstation;
Described Big Dipper ground monitoring work station, is used for monitoring the empty information literary composition of sky mood gesture, commander and distribution.
By the Big Dipper command subscriber computer arrange subordinate user's group and monitor under subordinate user's group pass message and commander message upload broadcast, it is simple to carry out when emergency management and rescue movable ground monitoring system erection.Big Dipper ground monitoring work station utilizes advanced digital GIS-Geographic Information System to realize monitoring based on the empty mood gesture of numerical map, and sky mood gesture is distributed to other ground air traffic control systems.
According to a detailed description of the invention of the present utility model, described surface-monitoring equipment farther includes: Big Dipper commander subscriber computer A and the Big Dipper commander subscriber computer B, each other Hot Spare.
According to a detailed description of the invention of the present utility model, after the start of described surface-monitoring equipment, Big Dipper commander subscriber computer A and Big Dipper commander subscriber computer B passes through power-on self-test, per second to a data process access device oneself state of report, the information such as including equipment state and the x time whether arriving regulation, accesses Big Dipper monitor workstation through transmission multiple connection equipment and shows in real time.Big Dipper commander subscriber computer A is primary communication equipment, and Big Dipper commander subscriber computer B is standby communication facility, and described surface-monitoring equipment has Hot Spare automatic switching capabilities: when the Big Dipper commands subscriber computer A normal, only uses Big Dipper commander subscriber computer A to send short message information;When Big Dipper commander subscriber computer A breaks down, Big Dipper commander subscriber computer B is normal, system automatically switches to Big Dipper commander subscriber computer B and sends up short message information.Owing to adopting Hot Spare active configuration, two Taibei bucket commander's subscriber computers will be simultaneously received position report and note code that airborne vehicle passes down, process through information redundancy and selects correct information, improve the transmission reliability of system further.
In order to realize the airborne instructions for use based on the airborne equipment integration of Beidou satellite navigation, miniaturization and low-power consumption, it is necessary to transceiver channel is adopted integrated design.
As shown in Figure 7, according to a detailed description of the invention of the present utility model, reception passage for the airborne equipment based on Beidou satellite navigation, wherein reception antenna receives the radiofrequency signal from satellite, out-of-band interference is leached through preselector, low-noise amplifier provides the gain of about 30dB, the first mixing is entered further after filtering, complete the first time frequency conversion of signal, amplification, filtering, amplified signal is exaggerated about 40dB again, entering the second mixing, after putting 45dB in two and amplifying, the intermediate-freuqncy signal of output 0dBm removes signal processing module.Transmission channel for the airborne equipment based on Beidou satellite navigation, the shaped filtering of 4.08MHz spread data streams come by signal processing module, enter phase converter and complete BPSK modulation, output 10dBm1615.68MHz phase-modulated signal, amplify through preliminary election, promote power amplifier, finally export the radiofrequency signal more than 40dBm, transmitting antenna launch.
Owing to receiving channel gain more than 110dB, being therefore easily subject to interference, be particularly also integrated with powerful transmitter in only small volume, transceiver insulation needs to process especially.Under the premise ensureing total noise of centrifuge, it is necessary to carry out enough filtering to launching signal, modulation data are formed process, reduces the out-of-band radiation launching signal;Need reception power supply and transmission power supply are taked quarantine measures, it is suppressed that by the issuable interference of power supply, three is indispensable.
According to a detailed description of the invention of the present utility model, for the radio circuit of the airborne equipment based on Beidou satellite navigation, on chip selects, the chip of widely used high integration replaces original discrete device;The material of more high-k is selected on material selects;In the distribution of holding wire, many employing device underground distribution modes.By multi-layer PCB, paster technique, sintering process miniaturization, concrete measure is as follows:
1) antenna oscillator miniaturization
Select high dielectric constant material and minimized radiation area, manufacture Novel miniaturization antenna oscillator, deduct antenna external structure and high frequency connectors (such as SMA), antenna oscillator is embedded in complete machine structure design.
2) receive-transmit isolation
Dual-mode antenna adopts plane figure to reduce the directly affecting of dual-mode antenna (spatial domain is overlapping);Improve the receive-transmit isolation (little area radiation face) of antenna;The spacing strengthening dual-mode antenna of maximum possible reduces the mutual Rhizoma Nelumbinis of antenna;Launching power amplifier design outfan and LNA input filter, it is achieved directly receive-transmit isolation improves.
3) launch phase modulation balance and carrier wave suppresses
Select the modulation of both-end balanced input, baseband signal adds shaping and differential amplifier circuit, reduces the phase deviation of modulation signal.Adopt space isolation technology and Phase Compensation to solve carrier wave and suppress problem.
4) 10W power amplifier miniaturization
Adopt class-a amplifier method for designing, reach the better linearity;Control to launch by power supply and reduce complete machine stand-by power consumption;Adopt embedded design, save 10W power amplifier volume.
5) low-noise amplifier miniaturization
Adopt embedded design, save low-noise amplifier volume, and ensure complete machine threshold level index.
6) wave filter miniaturization
Adopting miniaturization dielectric filter at radio-frequency front-end, end adopts microstripline filter to replace cavity body filter before transmission, adopts small-sized SAW filter in high intermediate frequency (IF) Design, adopts small package paster LC band filter at intermediate-frequency section.
7) Up/Down Conversion device and frequency combine miniaturization
Select or design specialized transceiving radio frequency application-specific integrated circuit, adopt the two-way frequency synthesizer IC of integrated VCO and loop filter, by public for the local oscillator receiving passage the first local oscillator and transmission channel, reduce volume and reduce power consumption.
8) frequency intermodulation and mirror image suppress
Reduce local oscillator quantity, improve local frequency, select best local frequency and select suitable modular design scheme.Each several part local oscillator and clock circuit are carried out shielding.
9) dual mode system electromagnetic interference controls
Power supply is adopted to control technology and isolated from power technology: the signal close to co-channel interference to be adopted time-division processing, emitting portion power supply and acceptance division independent power source is individually controlled.Adopt rational cavity and micro-strip design, reduce the interference between signal.
For making to possess certain anti-fading ability based on the airborne equipment of Beidou satellite navigation, according to a detailed description of the invention of the present utility model, via the digital signal of output after analog digital conversion, pre-filtering, secondary adaptive quantizing is carried out for intermediate-freuqncy signal, and reject invalid data, make equipment under fading environment can normal operation, and possess the ability of certain rejecting single-tone jamming, simultaneously, also the operand making signal processing reduces, thus reaching low-power consumption effect.
Fig. 8-1 to 8-3 respectively illustrates the simulation figure of quantization threshold and the snr loss adopting 3 bits, 2 bits and 1.5 bit dynamic quantizations;By contrasting it can be seen that for 2bit situation, when adopting optimal quantization value, quantify loss less than 0.6dB;With making the bit width that follow-up signal processes greatly reduce again.It addition, after adopting dynamic quantization, receiver will not be subject to the impact of received signal level fluctuation, nearly, the scope of 40dB suffers from good anti-fading ability and minimum quantization loss.This is extremely advantageous for the application of complex environment.It is therefore preferred that select to adopt 2 bits to carry out dynamic quantization.
As it is shown in figure 9, from the low intermediate frequency signal of radio-frequency module through ADC and pre-filtering module, be transformed to discrete-time signal and eliminate out-of-band noise (namely disturbing signal).Subsequently, according to the noise level that the change of Signal-to-Noise and post-processing unit are estimated, calculate the threshold value of second quantization, and carry out the process of second quantization according to threshold value.Translate the signals into as 2bit width, to reduce the hardware size (and then reduction process power consumption) of post-processing module.Meanwhile, it is capable to adaptation signal front end dynamically changes and has the ability of certain rejecting single-tone jamming.
Due to the level fluctuation of input satellite-signal and interference signal, according to fixed threshold, then it is difficult to take into account low and high level and changes dynamically, according to a detailed description of the invention of the present utility model, adopt dynamic threshold;After being preferably by the estimation to noise level, the estimation of incoming signal level and demodulation, the estimation of signal to noise ratio obtains optimum dynamic threshold.
After satellite exit signal locks, according to a detailed description of the invention of the present utility model, signal to noise ratio after demodulating can be obtained according to signal flow as shown in Figure 10;
Correlator is output as superposing of useful signal and noise power, and can be considered broadband signal, and its bandwidth is 1/T, T is pre-correlation bandwidth.Its power is carried out M time add up, can obtain for:
WBP k = ( Σ i = 1 M ( I i 2 + Q i 2 ) ) k
After despread, the signal of correlator output is narrow band signal, and power is represented by:
NBP k = ( Σ i = 1 M I i ) k 2 + ( Σ i = 1 M Q i ) k 2
By narrow band power normalization, obtain:
NP k = NBP k WBP k
Above formula is carried out K accumulation, obtains:
μ ^ N P = 1 K Σ k = 1 K NP k
Then signal-to-noise ratio (SNR) estimation is represented by:
C ^ N 0 = 10 l o g 10 ( 1 T μ ^ N P - 1 M - μ ^ N P )
When table 1 illustrates employing 8bit quantization and bis-adaptive quantizing both difference quantification manners of 2bit, hardware platform consumes resource comparison table:
Quantization algorithm type 8bit quantifies Bis-adaptive quantizings of 2bit
Combination logic (look-up table LUT) 32170 23109
Depositor 33215 20536
Logical resource (LE) 37681 26263
Internal RAM (bits) 85341 51880
Multiplier 43 15
Table 1
Visible by contrasting, although this utility model have employed secondary adaptive quantizing, but owing to translating the signals into as 2bit width, after reducing, need hardware size (and then reduction process power consumption) the various resources of processing module can both save more than 30%.
In the Big Dipper airborne subscriber computer main frame connected mode with antenna, if taking the compound mode of multi-cable, then need five lines, namely two radio-frequency cables are respectively used to transmitting transceiver two-way Big Dipper radiofrequency signal, power supply needed for two power line delivering power amplifiers, one controls the control line that power amplifier is launched.The connected mode of this high-low frequency mixed loading, line is many, and process and assemble is complicated, and reliability is low, and cost is high, and the connection reliability under the high vibration environment of aloft high-speed motion is had a greatly reduced quality especially.
According to a detailed description of the invention of the present utility model, adopting single cable multi signal transmission means, utilize a radio-frequency cable, transmission be there is a need to the signal of transmission, make the connection between main frame and aerial head easy, drastically increase reliability and the maintainability of connection.
As shown in figure 11, the operation principle of the transmission duplex in utilization communication, utilize duplexer to realize transceiver insulation, complete interior feed by cable core, detect RF small signals simultaneously, serve as the on-off control of power amplifier, reach the purpose of full-duplex communication location.
According to a detailed description of the invention of the present utility model,
Blank pipe emergency management and rescue Beidou communication navigation integral system message kind includes following five classes:
(1) infomational message is passed under airborne vehicle
1) when airborne location information is effective, and when the airborne subscriber computer delivery time of the Big Dipper arrives, Airborne Terminal automatically generates aircraft position report, gives in the lump simultaneously and pass under the airborne subscriber computer of the Big Dipper after the note code that pilot selects being inserted respective field.
2) when airborne location information is invalid, and the short message that the Big Dipper airborne subscriber computer delivery time has pilot to select when arriving sends task, the note code that pilot is selected by Airborne Terminal is given after inserting the respective field in lower fly-by office staff's short message message and is passed under the airborne subscriber computer of the Big Dipper.
3) when airborne location information is invalid, and when the airborne subscriber computer delivery time of the Big Dipper arrives, Airborne Terminal does not have short message to send task, and Airborne Terminal sends active location control instruction to the airborne subscriber computer of the Big Dipper, starts the airborne subscriber computer active location application of the Big Dipper.
(2) control and state message between airborne equipment
1) Airborne Terminal is the airborne end control equipment of system.According to system job demand, automatic or manual the control message produced the airborne subscriber computer of the Big Dipper can be intervened.
2) during normal operation, the airborne subscriber computer of the Big Dipper is per second reports an oneself state information to Airborne Terminal, after receiving the control message that Airborne Terminal sends, carries out response in next state message.
(3) infomational message is uploaded on ground
System ground is uploaded message and is included that infomational message point-to-point is uploaded in ground, ground broadcasts (or multicast) and uploads infomational message and control message is uploaded on ground.
(4) ground uploading system controls message (as mourn in silence, communicate/active location control etc.)
Ground uploading system controls message for controlling the mode of operation/state of airborne equipment, such as the selection of communication/active location, radio listening silence control etc..
(5) control and state message between ground installation
Control between ground installation to command the mode of operation of subscriber computer to be controlled and state acquisition the ground Big Dipper with state message for ground Big Dipper monitor workstation.
The above, it it is only preferred embodiment of the present utility model, not this utility model is done any pro forma restriction, although this utility model is disclosed above with preferred embodiment, but it is not limited to this utility model, any those skilled in the art, without departing within the scope of technical solutions of the utility model, when the technology contents of available the disclosure above makes a little change or is modified to the Equivalent embodiments of equivalent variations, in every case it is the content without departing from technical solutions of the utility model, any simple modification above example made according to technical spirit of the present utility model, equivalent variations and modification, all still fall within the scope of technical solutions of the utility model.

Claims (10)

1. based on an airborne equipment for Beidou satellite navigation, including:
The airborne subscriber computer of the Big Dipper, airborne sail information datatron and cockpit traffic information display;
The airborne subscriber computer of the described Big Dipper, is used for receiving and send Beidou communication information;
Described airborne sail information datatron, has been used for encoding and decoding task and the airborne navigation information data of combined treatment of airborne vehicle Big Dipper information;
Described cockpit traffic information display, shows for information and controls, providing human-computer interaction interface for pilot;
The airborne subscriber computer of the described Big Dipper farther includes antenna and main frame.
2. the airborne equipment based on Beidou satellite navigation according to claim 1, it is characterised in that:
Described antenna farther includes:
Power amplifier, for being amplified to the high power levels required for long-distance transmissions in tranmitting frequency by low level signal.
3. the airborne equipment based on Beidou satellite navigation according to claim 2, it is characterised in that:
Described antenna farther includes:
Emission filter, for filtering the band stray signal exported in signal of power amplifier.
4. the airborne equipment based on Beidou satellite navigation according to claim 3, it is characterised in that:
Described antenna farther includes duplexer.
5. the airborne equipment based on Beidou satellite navigation according to claim 4, it is characterised in that:
Described duplexer farther includes the Big Dipper and receives LNA unit, emission controlling unit and conjunction road processing unit;
The described Big Dipper receives LNA unit, does radio-frequency front-end process for the Big Dipper receives small-signal;
Emission controlling unit, for controlling Big Dipper emission power amplifier;
Described conjunction road processing unit, launches signal synthesize for the Big Dipper receives small-signal and the Big Dipper.
6. the airborne equipment based on Beidou satellite navigation according to claim 5, it is characterised in that:
Described main frame farther includes converter module, signal processing module signal, message processing module and power module;
Described converter module includes launching channel and receiving channel, has been used for up/down frequency conversion, gain balance, intermediate frequency filtering;
Signal processing module, the carrying out of the simulation low intermediate frequency signal for converter module is sent here is sampled, and simulation low intermediate frequency signal is transformed to time discrete digital signal;
Described message processing module is used for processing reception data;Described process includes but not limited to the extraction to broadcast, public, the communication information, it is achieved user authorizes;
Described power module, is used for powering.
7. the airborne equipment based on Beidou satellite navigation according to claim 6, it is characterised in that:
Described signal processing module, be further used for catching to received signal, follow the tracks of, navigation message demodulation, time difference measurement;The transmission base band data that message processing module is sent here carries out spread processing, and the data after spread spectrum are sent converter module, produces modulated spread spectrum signal.
8. the airborne equipment based on Beidou satellite navigation according to claim 7, it is characterised in that:
Power module also includes electromagnetic interface filter.
9. the airborne equipment based on Beidou satellite navigation according to claim 8, it is characterised in that:
Airborne sail information processor pair external tapping includes:
With the RS-422 interface that the airborne subscriber computer of the Big Dipper carries out data crosslinking;RS-422 interface with the crosslinking of cockpit traffic display;The RS-232 interface loaded for data and detect;Carrier aircraft power interface;Standby RS-422 interface: the airborne navigation data source of combined treatment.
10. the airborne equipment based on Beidou satellite navigation according to claim 9, it is characterised in that:
Described cockpit traffic information display has three external interfaces of USB, RS-232 and RS-422, is carried out data loading and output by RS-232, is cross-linked by RS-422 interface and airborne sail information datatron;Cockpit traffic display and the crosslinking of airborne sail information datatron, receive the data that airborne sail information datatron transmits, provide the human-computer interaction interface of controller and Pilot Data's chain communications applications for pilot and ground crew.
CN201620159312.1U 2016-03-02 2016-03-02 Airborne equipment based on big dipper satellite navigation Active CN205405927U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105738929A (en) * 2016-03-02 2016-07-06 北京盈想东方科技发展有限公司 Beido communication navigation integrated airborne terminal
CN106656309A (en) * 2017-01-06 2017-05-10 四川克瑞斯航空科技有限公司 Satellite communication system about flight device
CN112073114A (en) * 2020-09-02 2020-12-11 河南科技大学 Beidou satellite navigation system integrating data security function

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105738929A (en) * 2016-03-02 2016-07-06 北京盈想东方科技发展有限公司 Beido communication navigation integrated airborne terminal
CN106656309A (en) * 2017-01-06 2017-05-10 四川克瑞斯航空科技有限公司 Satellite communication system about flight device
CN112073114A (en) * 2020-09-02 2020-12-11 河南科技大学 Beidou satellite navigation system integrating data security function

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