CN104407358A - Regenerative signal source for second-generation Beidou satellite signal and generating method thereof - Google Patents
Regenerative signal source for second-generation Beidou satellite signal and generating method thereof Download PDFInfo
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- CN104407358A CN104407358A CN201410711648.XA CN201410711648A CN104407358A CN 104407358 A CN104407358 A CN 104407358A CN 201410711648 A CN201410711648 A CN 201410711648A CN 104407358 A CN104407358 A CN 104407358A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/21—Interference related issues ; Issues related to cross-correlation, spoofing or other methods of denial of service
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/23—Testing, monitoring, correcting or calibrating of receiver elements
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radio Relay Systems (AREA)
Abstract
The invention discloses a regenerative signal source for a second-generation Beidou satellite signal and a generating method thereof. The signal source comprises a power supply device, an outdoor active receiving antenna, a signal-regenerating processing device and an indoor transmitting antenna, wherein the power supply device is used for supplying power to the signal-regenerating processing device; an output end of the outdoor receiving antenna is connected with an input end of the signal-regenerating processing device; an input end of the indoor transmitting antenna is connected with an output end of the signal-regenerating processing device. The signal source is relatively small in volume and flexible in power supplying manner, can despread and filter received signals so as to filter out noise and keep effective signals, so that signals obtained through up-conversion are enabled to be similar to signals sent from a satellite, the fact that signal coverage with a high signal-to-noise ratio and a high dynamic range is achieved in an area where real satellite signals cannot reach is ensured, and the problem that a multi-array element anti-interference antenna cannot receive the signals effectively in a clouding environment is solved.
Description
Technical field
The present invention relates to satellite communication positioning field, particularly a kind of implementation method of Beidou II regenerative satellite-signal.
Background technology
Along with the Beidou satellite navigation system strategic of China's autonomous Design is progressively ripe, Beidou satellite navigation equipment especially unjammable navigation equipment has entered into the critical period of commercial application; Often need the real satellite signal of outdoor to be forwarded to indoor at the scientific research of unjammable navigation equipment, production, test stage, the ephemeris of finishing equipment receive, school time, the function such as location.Traditional solution adopts common repeater that outdoor signal is carried out analog forwarding, namely amplifies signal and noise simultaneously; After many array element anti-interference antenna receives this signal, even if adopt the low noise amplifier that noise figure is little again, the power of noise also only can increase, and causes signal to noise ratio (S/N ratio) to reduce.Because conventional repeaters does not promote signal quality, therefore by appearance slightly strong signal be easily taken as undesired signal suppressed fall; And if signal is slightly weak, will not reach receiving sensitivity requirement, this will cause great instability to actual use.
Summary of the invention
The technical issues that need to address of the present invention are to provide a kind of the Beidou II regenerative satellite signal generation device and the implementation method that meet anti-interference antenna reception requirement, to guarantee that the region that cannot arrive at real satellite signal realizes the quorum sensing inhibitor of high s/n ratio, high dynamic range.
For solving the problems of the technologies described above, the technical solution used in the present invention is as follows.
Beidou II satellite-signal regenerative signal source, comprises supply unit, outdoor active receiving antenna, signal regeneration treating apparatus and indoor emitting antenna; Described supply unit is used for providing power supply for signal regeneration treating apparatus; Outdoor receiving antenna is used for the outer Beidou II satellite-signal of receiving chamber, and the output terminal of outdoor receiving antenna is connected by the input end of screened coaxial cable with signal regeneration treating apparatus; Signal regeneration treating apparatus is used for catching, follow the tracks of and regenerating of signal; The navigation signal that indoor emitting antenna is used for signal regeneration treating apparatus exports is transmitted into indoor in circular polarisation mode, and the input end of indoor emitting antenna passes through the output terminal of screened coaxial cable connection signal regenerating treater.
The concrete structure of signal regeneration treating apparatus of the present invention is: described signal regeneration treating apparatus comprises the Receiver Module, signal regeneration module, radiofrequency emitting module and the power control module that connect successively, the outer receiving antenna of input end junction chamber of described Receiver Module, emitting antenna in the output terminal junction chamber of power control module; Wherein, Receiver Module is for completing down coversion and the digital intermediate frequency signal of output after A/D conversion of radiofrequency signal; Signal regeneration module for completing the catching of digital intermediate frequency signal, follow the tracks of, generate digital intermediate frequency signal through noise reduction process, and the positioning calculation of completing user position; Radiofrequency emitting module is changed the D/A of digital intermediate frequency signal for completing, and is carried out upconversion process; Power control module is for completing the control of the emission of radio frequency signals power after to up-conversion.
Further improvement of the present invention is: described supply unit is 220V AC power or 19V direct current supply.
Beidou II satellite-signal regenerative signal creating method, the method, based on Beidou II satellite-signal regenerative signal source, comprises supply unit, outdoor active receiving antenna, signal regeneration treating apparatus and indoor emitting antenna; Described signal regeneration treating apparatus comprises the Receiver Module, signal regeneration module, radiofrequency emitting module and the power control module that connect successively; The method specifically comprises the following steps:
A. power-on device, makes signal regeneration treating apparatus normally work;
B. the outer Beidou II satellite-signal of outdoor active receiving antenna receiving chamber filtering and the process of low noise pre-amplification are carried out to it;
C. transferred to the Receiver Module down-converter unit of signal regeneration treating apparatus through the signal of pre-amplification process by screened coaxial cable, radiofrequency signal is converted to analog if signal;
D. Receiver Module down-converter unit is converted the A/D converting unit that the analog if signal obtained delivers to Receiver Module, be converted to digital intermediate frequency signal;
E. the digital intermediate frequency signal after A/D conversion is transferred to signal regeneration module, the catching of complete pair signals, to follow the tracks of, and the digital intermediate frequency signal generated through noise reduction process, simultaneously positioning calculation unit realize locate, test the speed, the resolving of temporal information, and with RS422/RS232 interface by Devices to test protocol requirement output reference channel status with resolve information;
F. the digital intermediate frequency signal through noise reduction process is transferred to radiofrequency emitting module, the D/A converting unit through radiofrequency emitting module is converted to the analog if signal that output amplitude is not less than 0.5Vpp;
G. the analog if signal exported by radiofrequency emitting module exports up-conversion signal after intermediate frequency filtering, mixing and power amplification, then up-conversion signal is transferred to power control module;
H. power control module completes and controls the power of regenerated signal, and exporting the satellite-signal meeting reception requirement will by indoor emitting antenna real-time Transmission to indoor reception terminal.
Owing to have employed above technical scheme, the invention technological progress is as follows.
Small volume of the present invention, power supply mode are flexible, by signal processing method, the signal of reception can be carried out despreading, filtering, make the signal to noise ratio (S/N ratio) of the signal of reception from-24dB become on the occasion of, thus filtering noise, retain useful signal, spread spectrum again, make the signal that the signal approximation satellite obtained by up-conversion is sent, guarantee that the region that cannot arrive at real satellite signal realizes the quorum sensing inhibitor of high s/n ratio, high dynamic range, solve many array element anti-interference antenna hide under worn-out environment cannot the problem of effective Received signal strength.
The present invention generates owing to have employed regenerative signal, can flexible configuration signal output type, comprises the combination of independent P code, separately C code or P code and C code; The built-in positioning calculation unit of signal regeneration module positions and tests the speed and the resolving of temporal information, and the information of resolving can be supplied to equipment under test and use as benchmark; Can also add dynamic scene flexibly, range of application is wider.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of signal source of the present invention;
Fig. 2 is the regeneration process flow diagram of signal of the present invention;
Fig. 3 is the structured flowchart of each module of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is further elaborated.
Beidou II satellite-signal regenerative signal source, its structure as shown in Figure 1, comprises supply unit, outdoor active receiving antenna, signal regeneration treating apparatus and indoor emitting antenna.Described supply unit is 220V AC power or 19V direct current supply, for providing power supply for signal regeneration treating apparatus; Outdoor receiving antenna is used for the outer Beidou II satellite-signal of receiving chamber, and the output terminal of outdoor receiving antenna is connected by the input end of screened coaxial cable with signal regeneration treating apparatus; Signal regeneration treating apparatus is used for catching, follow the tracks of and regenerating of signal; The navigation signal that indoor emitting antenna is used for signal regeneration treating apparatus exports is transmitted into indoor in circular polarisation mode, and the input end of indoor emitting antenna passes through the output terminal of screened coaxial cable connection signal regenerating treater.
Signal regeneration treating apparatus in the present invention comprises the Receiver Module, signal regeneration module, radiofrequency emitting module and the power control module that connect successively, the outer receiving antenna of input end junction chamber of described Receiver Module, emitting antenna in the output terminal junction chamber of power control module.
Wherein: Receiver Module is for completing down coversion and the digital intermediate frequency signal of output after A/D conversion of radiofrequency signal; Signal regeneration module for completing the catching of digital intermediate frequency signal, follow the tracks of, generate digital intermediate frequency signal through noise reduction process, and the positioning calculation of completing user position; Radiofrequency emitting module is changed the D/A of digital intermediate frequency signal for completing, and is carried out upconversion process; Power control module is for completing the control of the emission of radio frequency signals power after to up-conversion.The concrete structure of each module as shown in Figure 3.
The principle of work of modules of the present invention is as described below:
The Beidou satellite navigation signal that antenna receives by Receiver Module carries out low noise amplification, filtering process, the 1222MHz local oscillation signal exported with phaselocked loop LMX2531LQ2570E is after mixing, amplification, filtering, export the analog if signal of 46.52MHz to ADC change-over circuit, analog if signal is converted to 16bit digital medium-frequency signal, then deliver to signal regeneration resume module.
Signal regeneration module realizes based on the scheme of FPGA+ARM, the regeneration that FPGA is used for the catching of Beidou satellite navigation signal, follows the tracks of, navigation message solution is in harmonious proportion digital intermediate frequency signal, and the information such as duty being exported navigation message, original observed quantity and module by data bus interface; Resolving of FPGA and common completing user position and speed time (PVT) information of ARM microprocessor, ARM microprocessor is simultaneously for the control to regenerated signal generate pattern, and concrete principle is as follows:
(1) principle of digital intermediate frequency signal generation
Digital intermediate frequency signal adopts the principle of FPGA synthesis to realize, and required code stream, text, carrier frequency all obtain from tracking channel, due to the time loss of demodulation text, pseudo-code, carrier frequency need be postponed certain hour and uses.
(2) generation of short code signal
Selected time delay is the integral multiple in short code cycle, due to the periodicity of short code, the generation of short code signal only need revise modulation telegraph text content, and the local pseudo-code by tracking channel directly exports as current pseudo-code, arranges current text sign bit according to the text symbol content before 4ms.
(3) generation of pattern signal
Due to the aperiodicity of pattern signal and the corresponding relation of long code phase place and telegraph text content, need to long code carry out 4ms latch postpone, then with 4ms before text symbol-modulated.
(4) generation of intermediate frequency carrier frequency
Intermediate frequency carrier frequency is obtained by the intermediate frequency carrier frequency of tracking channel, and the IF-FRE of tracking channel further comprises the doppler information of Received signal strength.
(5) critical piece function:
Arm processor: complete the control to signal regeneration output mode, carries out data processing to each measured value of FPGA output and PVT resolves;
SDRAM storer: instruction when running for microprocessor stores;
NOR FLASH memory: for storing and executive routine;
RTC: provide system to keep time clock.
Radiofrequency emitting module exports 1984MHz local oscillation signal by 10MHz frequency standard signal through phaselocked loop LMX2531LQ2080E, exports 62MHz reference clock signal to signal regeneration module through frequency divider.The digital intermediate frequency signal that signal regeneration module exports is changed through DAC, the 1222MHz local oscillation signal analog intermediate frequency signal exported and phaselocked loop LMX2531LQ2570E exported, after mixing, amplification, filtering, exports the radiofrequency signal of 1268.52MHz to power control module.
Power control module is made up of two variable attenuators, realizes regulating with 1dB precision in the scope of 0 ~ 70dB output signal, to adapt to the requirement of varying environment to signal power by changing pad value.
Beidou II satellite-signal regenerative signal creating method, the method, based on above-mentioned Beidou II satellite-signal regenerative signal source, shown in its process flow diagram Fig. 2, specifically comprises the following steps:
A. power-on device, makes signal regeneration treating apparatus normally work.
B. the outer Beidou II satellite-signal of outdoor active receiving antenna receiving chamber filtering and the process of low noise pre-amplification are carried out to it.
C. transferred to the Receiver Module down-converter unit of signal regeneration treating apparatus through the signal of pre-amplification process by screened coaxial cable, radiofrequency signal is converted to analog if signal.
D. Receiver Module down-converter unit is converted the A/D converting unit that the analog if signal obtained delivers to Receiver Module, be converted to digital intermediate frequency signal.
E. the digital intermediate frequency signal after A/D conversion is transferred to signal regeneration module, the catching of complete pair signals, to follow the tracks of, and the digital intermediate frequency signal generated through noise reduction process, simultaneously positioning calculation unit realize locate, test the speed, the resolving of temporal information, and with RS422/RS232 interface by Devices to test protocol requirement output reference channel status with resolve information.
F. the digital intermediate frequency signal through noise reduction process is transferred to radiofrequency emitting module, the D/A converting unit through radiofrequency emitting module is converted to the analog if signal that output amplitude is not less than 0.5Vpp.
G. the analog if signal exported by radiofrequency emitting module exports up-conversion signal after intermediate frequency filtering, mixing and power amplification, then up-conversion signal is transferred to power control module.
H. power control module completes and controls the power of regenerated signal, and exporting the satellite-signal meeting reception requirement will by indoor emitting antenna real-time Transmission to indoor reception terminal.
Claims (4)
1. Beidou II satellite-signal regenerative signal source, is characterized in that: comprise supply unit, outdoor active receiving antenna, signal regeneration treating apparatus and indoor emitting antenna; Described supply unit is used for providing power supply for signal regeneration treating apparatus; Outdoor receiving antenna is used for the outer Beidou II satellite-signal of receiving chamber, and the output terminal of outdoor receiving antenna is connected by the input end of screened coaxial cable with signal regeneration treating apparatus; Signal regeneration treating apparatus is used for catching, follow the tracks of and regenerating of signal; The navigation signal that indoor emitting antenna is used for signal regeneration treating apparatus exports is transmitted into indoor in circular polarisation mode, and the input end of indoor emitting antenna passes through the output terminal of screened coaxial cable connection signal regenerating treater.
2. Beidou II satellite-signal regenerative signal source according to claim 1, it is characterized in that: described signal regeneration treating apparatus comprises the Receiver Module, signal regeneration module, radiofrequency emitting module and the power control module that connect successively, the outer receiving antenna of input end junction chamber of described Receiver Module, emitting antenna in the output terminal junction chamber of power control module.
3. Beidou II satellite-signal regenerative signal source according to claim 1, is characterized in that: described supply unit is 220V AC power or 19V direct current supply.
4. Beidou II satellite-signal regenerative signal creating method, is characterized in that: the method, based on Beidou II satellite-signal regenerative signal source, comprises supply unit, outdoor active receiving antenna, signal regeneration treating apparatus and indoor emitting antenna; Described signal regeneration treating apparatus comprises the Receiver Module, signal regeneration module, radiofrequency emitting module and the power control module that connect successively; The method specifically comprises the following steps:
A. power-on device, makes signal regeneration treating apparatus normally work;
B. the outer Beidou II satellite-signal of outdoor active receiving antenna receiving chamber filtering and the process of low noise pre-amplification are carried out to it;
C. transferred to the Receiver Module down-converter unit of signal regeneration treating apparatus through the signal of pre-amplification process by screened coaxial cable, radiofrequency signal is converted to analog if signal;
D. Receiver Module down-converter unit is converted the A/D converting unit that the analog if signal obtained delivers to Receiver Module, be converted to digital intermediate frequency signal;
E. the digital intermediate frequency signal after A/D conversion is transferred to signal regeneration module, the catching of complete pair signals, to follow the tracks of, and the digital intermediate frequency signal generated through noise reduction process, simultaneously positioning calculation unit realize locate, test the speed, the resolving of temporal information, and with RS422/RS232 interface by Devices to test protocol requirement output reference channel status with resolve information;
F. the digital intermediate frequency signal through noise reduction process is transferred to radiofrequency emitting module, the D/A converting unit through radiofrequency emitting module is converted to the analog if signal that output amplitude is not less than 0.5Vpp;
G. the analog if signal exported by radiofrequency emitting module exports up-conversion signal after intermediate frequency filtering, mixing and power amplification, then up-conversion signal is transferred to power control module;
H. power control module completes and controls the power of regenerated signal, and exporting the satellite-signal meeting reception requirement will by indoor emitting antenna real-time Transmission to indoor reception terminal.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110824507A (en) * | 2019-11-27 | 2020-02-21 | 中国科学院微小卫星创新研究院 | Simulator of upper note receiving processor of navigation satellite |
| CN113219500A (en) * | 2021-03-31 | 2021-08-06 | 成都飞机工业（集团）有限责任公司 | Satellite signal forwarding system used in semi-closed environment |
| CN115685274A (en) * | 2022-11-11 | 2023-02-03 | 国网思极位置服务有限公司 | Signal processing device and method, positioning collar, computer-readable storage medium |
| CN118091708A (en) * | 2024-01-15 | 2024-05-28 | 国家无线电监测中心 | A new reference source system and positioning method for satellite interference source positioning |
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| CN110824507A (en) * | 2019-11-27 | 2020-02-21 | 中国科学院微小卫星创新研究院 | Simulator of upper note receiving processor of navigation satellite |
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| CN118091708A (en) * | 2024-01-15 | 2024-05-28 | 国家无线电监测中心 | A new reference source system and positioning method for satellite interference source positioning |
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Application publication date: 20150311 |