CN105093247A - BeiDou based ground-based navigation signal networking system - Google Patents
BeiDou based ground-based navigation signal networking system Download PDFInfo
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- CN105093247A CN105093247A CN201510401178.1A CN201510401178A CN105093247A CN 105093247 A CN105093247 A CN 105093247A CN 201510401178 A CN201510401178 A CN 201510401178A CN 105093247 A CN105093247 A CN 105093247A
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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
- G01S19/38—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
- G01S19/39—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/42—Determining position
- G01S19/45—Determining position by combining measurements of signals from the satellite radio beacon positioning system with a supplementary measurement
- G01S19/46—Determining position by combining measurements of signals from the satellite radio beacon positioning system with a supplementary measurement the supplementary measurement being of a radio-wave signal type
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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
- G01S19/03—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers
- G01S19/10—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers providing dedicated supplementary positioning signals
- G01S19/11—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers providing dedicated supplementary positioning signals wherein the cooperating elements are pseudolites or satellite radio beacon positioning system signal repeaters
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Abstract
The invention belongs to the technical field of satellite navigations, more particularly to a BeiDou based ground-based navigation signal networking system, which comprises ground based pseudolites, ground based monitoring stations, BeiDou pseudolite compatible receiving terminals, and ground based navigation network operation and management centers. The psuedolites, together with the various ground based monitoring stations, form an optical fiber network. And through the optical fiber network, the psuedolites are connected with the ground based navigation network operation and management centers. The ground based psudolites broadcast ground based navigation signals and telegram texts. The ground based monitoring stations monitor completeness of signals from the psudolites, calculate the time difference between the psudolites and upload information to the ground based navigation network operation and management centers. The ground based navigation network operation and management centers conduct uniform calculations on time synchronizing information and transmit the completeness and the time information to psudolites through the optical fiber network. The BeiDou pseudolite compatible receiving terminals finally complete the position calculation for independent positioning and cooperative positioning.
Description
Technical field
The invention belongs to technical field of satellite navigation, particularly relate to a kind of foundation navigation signal network system based on the Big Dipper.
Background technology
Satellite navigation system has a wide range of applications in global service industry, military field.But because satellite runs on the track of liftoff about 20000km height, the satellite navigation signals that terrestrial user receives is very faint, sometimes causes signal stabilization poor, does not even receive satellite-signal.This to a certain degree on limit the service performance that satellite navigation system provides.And utilize ground pseudo satellite, pseudolite navigational system obviously can improve lifting satellite navigation system performance, but, region ground based on China's Beidou satellite navigation system strengthens technology and is also in the starting stage, correlative study is little, is substantially in blank, how to improve the space geometry distribution of satellite, reduce PDOP value, foundation navigation signal network and Beidou satellite navigation system can be compatible simultaneously, thus obviously promote the service performance of Beidou satellite system, are technical matterss urgently to be resolved hurrily.
Summary of the invention
In order to solve the problem, the present invention proposes a kind of foundation navigation signal network system based on the Big Dipper, comprise ground pseudo satellite, pseudolite, ground monitoring station, Big Dipper pseudo satellite, pseudolite compatible receiver terminal, foundation navigation signal network operation administrative center; Wherein ground pseudo satellite, pseudolite and each ground monitoring station form a fiber optic network, and are connected with foundation navigation signal network operation administrative center by fiber optic network; Big Dipper pseudo satellite, pseudolite compatible receiver terminal is connected with ground pseudo satellite, pseudolite with big-dipper satellite by wireless network; Ground pseudo satellite, pseudolite is responsible for broadcasting foundation navigation signal and text; Ground monitoring station is responsible for carrying out integrity monitoring to Pseudolite signal, resolves the time difference between pseudo satellite, pseudolite star, and information is uploaded foundation navigation signal network operation administrative center; Foundation navigation signal network operation administrative center is responsible for time synchronization information unification and resolves, and integrity and temporal information are passed to pseudo satellite, pseudolite by fiber optic network, and Big Dipper pseudo satellite, pseudolite compatible receiver terminal finally completes the location compute of location-independent and colocated.
Described ground pseudo satellite, pseudolite comprises 5 modules, control module, baseband signal generation module, radiofrequency signal generation module, pseudo-random pulse signal generation module and time and frequency standards signal generator module;
Wherein control module is responsible for receiving the parameter of PC, realizes the parameter configuration of each module, comprises the ranging code parameter configuration of baseband signal, the power setting of radiofrequency signal, door control unit time-hopping code generator are arranged, the configuration of pulse slot;
Baseband signal generation module utilizes base-band digital modulation technique, and in numeric field, complete data and the pseudo-code modulation of Big Dipper B1 and B3 signal, the symbolic information obtained is modulated to digital intermediate frequency baseband signal by DDS technology;
Radiofrequency signal generation module completes the variable frequency work of digital intermediate frequency to analog radio-frequency signal, meanwhile, is controlled the size of transmit signal power by programmable attenuator; Power controls to adopt digital power control and radio frequency analog signal power to control the mode combined;
Pseudo-random pulse signal generation module utilizes pseudo-noise code generator to produce pseudo-random pulse sequence, controls pulse pseudo satellite, pseudolite navigation signal when gate controlled switch is jumped according to corresponding slot table generation; Pseudo-random pulse signal generation technique need be adopted in order to produce accurate controlled pseudo-random pulse signal, comprising precise hard_drawn tuhes two aspects of the generation of pseudo-random pulse pattern and pseudo-random pulse signal; For pseudo-random pulse pattern generation technique, according to the cycle request of pseudo-random pulse, design corresponding pseudo-code generator; According to the slot requirements of design, the sequence pair total number of timeslots complementation utilizing corresponding code generator to produce obtains the position of this pulse signal; Generation for pseudo-random pulse signal is intended adopting controls in advance strategy, namely the pulse position of each yard of cycle generation is determined by the pulse position calculated in the previous code cycle, ensure real-time and the synchronism of pseudo-random pulse signal so to greatest extent, thus realize precise hard_drawn tuhes.
Described time and frequency standards signal generator module is responsible for whole pseudolite systems and provides standard clock signal, meanwhile, completes the information interaction with Information Network tube hub; Clock frequency reference source is the core of pseudo satellite, pseudolite, and being responsible for provides stable and accurate clock needed for each module of system; In order to ensure the reliability of clock module, clock frequency reference source is intended employing 3 kinds of modes and is realized, and comprises optical fiber time frequency signal, internal reference source, external reference clock signal; Produce the clock signal of 10MHz high stability as reference clock source by fiber bit clock module, produce the frequency standard signal needed for each module by driving and frequency division; Wherein, the clock frequency reference source of 10MH is produced or unrestricted choice atomic frequency standard by the high steady constant temperature crystal provided for oneself in system.
The workflow of described ground pseudo satellite, pseudolite: first control module configures each cell parameters, baseband signal generation module adopts data and the pseudo-code modulation of digital modulation technique settling signal, obtain digital intermediate frequency baseband signal, then the frequency conversion of intermediate frequency to analog radio-frequency signal is completed by RF frequency signal generator, and the watt level that control transmits, pseudo-random pulse signal generator module produces random pulse sequence, control pulse pseudo satellite, pseudolite navigation signal when gate controlled switch is jumped by corresponding slot table generation, last by antenna transmission, whole process time and frequency standards module provides accurate clock signal for system.
It is complete in the digital baseband part of pseudo satellite, pseudolite that described digital power controls, and the task that digital power controls is the satellite power according to setting, completes the control of satellite-signal power, thus meet the controllable requirement of pseudo satellite, pseudolite emissive power in digital baseband part;
The task that described radio frequency analog signal power controls has been the programed power control of channel radio frequency signal; Meanwhile, the harmonic power transmitted derives from the distortion of frequency mixer and amplifier, and system output power is less, and output stage adopts the linear power amplifier of low distortion, has good harmonic characteristic; Meanwhile, the outer harmonic wave of the method inhibition zone of wave filter and clutter is adopted in output stage; After wave filter, reach <40dB harmonics restraint degree; The source of clutter comprises introduce in the crosstalk of optical mixing process and Direct Digital signal generative process spuious; Clutter outside band is effectively suppressed by wave filter; For ensureing the clutter recognition performance of inband signaling, being designed by rational frequency, avoiding the crosstalk signal of optical mixing process to fall in signal band; If system needs 60dB spurious reduction, then DDS blocks rear phase place 10bit, if DDS block after phase place 11bit, then reach the phase place rejection of 66dB.
Described ground monitoring station is connected to form successively by antenna, the first radio frequency unit, the first baseband signal processing unit and information process unit four parts; Ground monitoring station can receive simultaneously utilize local coordinate system, pseudo satellite, pseudolite coordinate and real-time monitored amount to complete timing tracking accuracy measurement between pseudo satellite, pseudolite, system health monitoring, monitoring station, ground receives Big Dipper satellite signal and generates difference information in real time simultaneously, then by data-interface, pseudo satellite, pseudolite observed quantity, pseudo satellite, pseudolite timing tracking accuracy, system health monitoring information and difference information is sent to operations control center;
Wherein said antenna receiving signal, the first radio frequency unit carries out filtering to signal, and amplify, described information process unit extracts original observed data, navigation message respectively from the first baseband signal processing unit, receives GNSS original observed data; Utilize original observed quantity completion system integrity monitoring and calculating; Carry out pseudorange One-Point Location and generate difference information in real time, last Output rusults is sent to ground base navigation information network operations control center.
Described Big Dipper pseudo satellite, pseudolite compatible receiver terminal comprises Anneta module, the second radio frequency unit, the second baseband signal processing unit, navigation calculation module and user interface, Big Dipper satellite signal and Pseudolite signal can be received simultaneously, complete the catching of two kinds of navigation signals, follow the tracks of, demodulation, original observed quantity extract, possess location-independent and colocated function;
Described second radio frequency unit comprises each frequency low noise amplifier and receives down conversion module; Adopt radio frequency integrated chip and the miniaturization passive component of Highgrade integration, applied microwave multilayer microstrip-circuit technology, the height realized in the finite space is integrated; Second radio frequency unit adopts superhet architecture, to obtain splendid selectivity and sensitivity, applies multistage agc circuit simultaneously, to adapt to dynamic requirement, realizes receiving the selection of different frequent points, the function of AGC status monitoring;
Described second baseband signal processing unit is followed the tracks of by capture circuit, multi channel signals and is extracted circuit with demodulator circuit, basic observation, timing circuit, interface control circuit form, for completing Big Dipper satellite signal and Pseudolite signal fast Acquisition, tracking and demodulation coding function, extracting and exporting the original observation information of pseudorange, carrier phase, carrier doppler, navigation message; Dipper system location-independent and dipper system and pseudo satellite, pseudolite colocated is realized according to original observed quantity; Adopt real-time multi-task structure; Each task is separate, has respective treatment scheme respectively; Each task takes semaphore synchronization mechanism; Adopt dma mode to carry out data transmission, reduce the expense of CPU in transmission, improve data transmission efficiency and software processing capability.
In described second baseband signal processing unit, A/D sampled signal through digital quadrature down conversion, adopts multichannel time-domain parallel to be correlated with and the algorithm of frequency domain FFT in capture circuit, completes and to search ranging code phase place and the determination of carrier doppler; Multi channel signals follows the tracks of the demodulation that the track algorithm combined with demodulator circuit application FLL/PLL ring realizes tracking to carrier wave and navigation message, adopts the delay lock loop of photocarrier method to follow the tracks of spreading code; Basic observation extraction unit will complete the extraction of pseudorange, carrier phase and these basic observations of Doppler; Navigation message and observed quantity data deliver to big-dipper satellite positioning calculation unit by parallel interface; For overcoming multipath effect, adopt pulse signal form anti-multipath technology; By the analysis of paired pulses multipath signal, complete the research of ground pseudo satellite, pseudolite multipath signal time delay, amplitude and phase propetry and the impact of multipath pulse signals tracking performance.
Described foundation navigation signal network operation administrative center is divided into business subsystem and supports subsystem, and wherein business subsystem comprises: system time difference solving unit, pseudo satellite, pseudolite time synchronizing unit, the process of pseudo satellite, pseudolite navigation task and administrative unit, navigation network information monitoring and assessment unit; Support subsystem comprises: communication supporter, calculating supporter, data storage cell, user interaction unit;
Described system time difference solving unit collects the Beidou satellite system time of each pseudo satellite, pseudolite time measurement result and the reception of importing into from ground monitoring station, calculate foundation navigation signal network and dipper system mistiming by system time difference solving technique, and result is sent into the process of pseudo satellite, pseudolite navigation task and administrative unit generates navigation message;
Described pseudo satellite, pseudolite time synchronizing unit carries out reduction process by the many groups pseudo satellite, pseudolite clock correction information obtained multiple monitoring receiver, when obtaining the unified pseudo satellite, pseudolite clock face of foundation navigation signal network;
The process of described pseudo satellite, pseudolite navigation task and administrative unit are responsible for controlling the management of the navigation task of all pseudo satellite, pseudolites of network internal, comprise generation navigation information, complete ephemeris computation, provide clocking error correction to broadcast pseudo satellite, pseudolite health status;
Described navigation network information monitoring and assessment unit complete Big Dipper foundation navigation signal network monitor and Performance Evaluation, the Monitoring Data that system utilizes monitoring station to obtain carries out Real-Time Monitoring and display to the pseudo satellite, pseudolite constellation state of whole foundation navigation signal network, aerial signal quality, navigation information state, obtains ground base navigation net service performance index by COMPREHENSIVE CALCULATING assessment.
Described calculating supporter provides computational resource support to the various computation requirements required for business subsystem, comprises the server hardware calculating middleware, Geographic Information System (GIS) software and correspondence;
Described communication supporter provides communication resource support to the various transmission demands required for business subsystem, comprises function and the hardware environment thereof such as network data transceiver module, Network traffic control unit, as high speed fibre network, router;
Described user interaction unit adopts B/S or C/S structure, and friendly graphical interfaces, carries out bookkeeping to Big Dipper foundation navigation signal network;
The total data that described data storage cell real-time collecting is relevant with performance management; Format analysis and conversion are carried out to original performance data, preserves primary data information (pdi); Whole system controls relevant important operation log, record persistence, and can inquire about; There is provided syslog analysis, generating report forms function; Log Administration System is system trouble analysis, control analysis provides Data support.
Beneficial effect of the present invention is: 1, Pseudolite signal system design of the present invention is mutually compatible with the Big Dipper.2, the time synchronized of high precision pseudo satellite, pseudolite and big-dipper satellite is realized.3, transform existing general Beidou receiver, the compatible interoperation realizing Pseudolite signal and Big Dipper satellite signal receives.4, the present invention completes the design of the whole ground navigation network Iarge-scale system based on the Big Dipper, comprises pseudolite systems, monitoring station, operations control center and Big Dipper compatible receiver terminal.5, improve the space geometry distribution of satellite, reduce PDOP value.
Accompanying drawing explanation
Fig. 1 is system global structure figure,
Fig. 2 is ground pseudo satellite, pseudolite composition diagram,
Fig. 3 is monitoring station system composition diagram,
Fig. 4 is Big Dipper pseudo satellite, pseudolite compatible receiver terminal system composition diagram,
Fig. 5 is foundation navigation signal network operation administrative center schematic diagram,
Fig. 6 is optical fiber time bi-directional schematic diagram,
Fig. 7 is Big Dipper ground base navigation system business process figure.
Embodiment
Below in conjunction with accompanying drawing, embodiment is elaborated.
Within the scope of certain region foundation navigation signal network management, foundation navigation signal network operation administrative center is responsible for carrying out managing to local all pseudo satellite, pseudolites and controlling.Foundation navigation signal network operation administrative center converges various data and the state of pseudo satellite, pseudolite, monitoring station in ground base navigation network, carries out overall treatment, generates various steering order and data.Foundation navigation signal network operation administrative center is responsible for information processing and the task coordinate of whole foundation navigation signal network, collects observation data and the work information at all ground monitoring stations, computing system integrity, and availability, pseudo satellite, pseudolite ephemeris generate.
Network operation administrative center and pseudo satellite, pseudolite and monitoring station composition ground base navigation network system, foundation navigation signal network internal time synchronized directly adopts optical fiber link to realize time synchronized.The outside distance according to foundation navigation signal network and ground control centre and appointed condition different, adopt different time synchronized systems.For nearer region (50-100 km) the foundation navigation signal network in distance ground control centre, directly can adopt the time service of optical fiber time bi-directional, realize synchronous with during the Big Dipper of foundation navigation signal network.The temporal information that Surveillance center and pseudo satellite, pseudolite send over respectively by reception opposite end website, is used as the pass gate signal of local zone time interval counter.By the mistiming that measurement local zone time and opposite end send over, calculate two places clock correction, thus adjust another ground Zhong Yuan with one end Zhong Yuan for benchmark, make two places Zhong Yuan synchronous.For the foundation navigation signal network distant with Beidou satellite navigation system ground control centre (or possessing the monitoring station of time synchronized function), satellite two-way time transfer method is adopted to realize and the time synchronized during Big Dipper.
As Fig. 1, whole system comprises ground pseudo satellite, pseudolite, ground monitoring station, Big Dipper pseudo satellite, pseudolite compatible receiver terminal, foundation navigation signal network operation administrative center four major part.Wherein, ground pseudo satellite, pseudolite is responsible for broadcasting foundation navigation signal and text; Ground monitoring station is responsible for carrying out integrity monitoring to Pseudolite signal, resolves the time difference between pseudo satellite, pseudolite star, and information is uploaded network management center; Foundation navigation signal network operation administrative center is responsible for that time synchronization information is unified to be resolved, pseudo satellite, pseudolite and each monitoring station and composition fiber optic network, and integrity and temporal information are passed to pseudo satellite, pseudolite by fiber optic network; Big Dipper pseudo satellite, pseudolite compatible receiver terminal finally completes the location compute of location-independent and colocated.
As Fig. 2, ground pseudo satellite, pseudolite comprises and mainly comprises five functional module, control module, baseband signal generation module, radiofrequency signal generation module, pseudo-random pulse signal generation module and time and frequency standards signal generator module.Control module configures each cell parameters, baseband signal generation module adopts digital modulation technique to complete navigation message data and pseudo-code modulation, obtain digital intermediate frequency baseband signal, then the frequency conversion of intermediate frequency to analog radio-frequency signal is completed by RF frequency signal generator, and the watt level that transmits is controlled by programmable attenuator, pseudo-random pulse signal generator module produces random pulse sequence, control pulse pseudo satellite, pseudolite navigation signal when gate controlled switch is jumped by corresponding slot table generation, last by antenna transmission, whole process time and frequency standards module provides accurate clock signal for system.
As Fig. 3, monitoring station is made up of antenna, the first radio frequency unit, the first base-band information process and information process unit four parts.Wherein Received signal strength is responsible for by antenna, and the first radio frequency unit carries out frequency conversion to signal, filtering, and amplify, information process unit extracts original observed data, navigation message respectively from the first baseband signal processing unit, receives GNSS original observed data; Utilize original observed data to complete pseudorange error correction, and pseudo satellite, pseudolite time precision is measured, and system health is monitored and calculated, and generate difference information in real time, last Output rusults is sent to network management center.
As Big Dipper pseudo satellite, pseudolite compatible receiver terminal in Fig. 4, comprise Anneta module, the second radio frequency unit, the second baseband signal processing unit, navigation calculation module and user interface, each model calling relation as shown in FIG..The navigation signal receiving the Big Dipper and pseudo satellite, pseudolite is responsible for by antenna, amplify through the second radio frequency unit process, second baseband signal processing unit demodulation coding, extract and export the original observation information such as pseudorange, carrier phase, carrier doppler, navigation message, the second baseband signal processing unit realizes dipper system location-independent and dipper system and pseudo satellite, pseudolite colocated according to original observed quantity.Wherein the second baseband signal processing unit is followed the tracks of by capture circuit, related channel program, multi channel signals and is extracted circuit with demodulator circuit, basic observation, timing circuit, interface control circuit form.
As shown in Figure 5, foundation navigation signal network operation administrative center mainly comprise system time difference solving unit, pseudo satellite, pseudolite time synchronizing unit, the process of pseudo satellite, pseudolite navigation task with administrative unit, navigation network information monitoring with assessment unit, calculate supporter, the supporter that communicates, user interaction unit, data storage cell.Operations control center is responsible for carrying out managing to local all pseudo satellite, pseudolites and controlling.Foundation navigation signal network operation administrative center converges various data and the state of pseudo satellite, pseudolite, monitoring station in ground base navigation network, carries out overall treatment, generates various steering order and data.Foundation navigation signal network operation administrative center is responsible for information processing and the task coordinate of whole foundation navigation signal network, collects observation data and the work information at all ground monitoring stations, computing system integrity, and availability, pseudo satellite, pseudolite ephemeris generate.
As shown in Figure 6, for region (50-100 km) the foundation navigation signal network that distance ground control centre is nearer, have employed the time service of optical fiber time bi-directional.The temporal information that Surveillance center and pseudo satellite, pseudolite send over respectively by reception opposite end website, is used as the pass gate signal of local zone time interval counter.By the mistiming that measurement local zone time and opposite end send over, calculate two places clock correction, thus adjust another ground Zhong Yuan with one end Zhong Yuan for benchmark, make two places Zhong Yuan synchronous.
As shown in Figure 7, monitoring station monitoring Pseudolite signal integrity, time difference information, and resolve the pseudo satellite, pseudolite mistiming, then network operation administrative center is uploaded to, Unified evaluation time synchronizing information, and by integrity, temporal information refills pseudo satellite, pseudolite, pseudo satellite, pseudolite broadcasts navigation signal and text, and continuing the monitoring of monitored station, last compatible receiver terminal receives navigation signal, completes independence or colocated.
Above content further illustrates in conjunction with concrete preferred embodiment is made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For the those of ordinary skill of technical field of the present invention, without departing from the inventive concept of the premise, some simple deduction or replace can also be made, all should be considered as belonging to protection scope of the present invention.
Claims (10)
1. based on a foundation navigation signal network system for the Big Dipper, it is characterized in that, comprise ground pseudo satellite, pseudolite, ground monitoring station, Big Dipper pseudo satellite, pseudolite compatible receiver terminal, foundation navigation signal network operation administrative center; Wherein ground pseudo satellite, pseudolite and each ground monitoring station form a fiber optic network, and are connected with foundation navigation signal network operation administrative center by fiber optic network; Big Dipper pseudo satellite, pseudolite compatible receiver terminal is connected with ground pseudo satellite, pseudolite with big-dipper satellite by wireless signal; Ground pseudo satellite, pseudolite is responsible for broadcasting foundation navigation signal and text; Ground monitoring station is responsible for carrying out integrity monitoring to Pseudolite signal, resolves the time difference between pseudo satellite, pseudolite star, and information is uploaded foundation navigation signal network operation administrative center; Foundation navigation signal network operation administrative center is responsible for time synchronization information unification and resolves, and integrity and temporal information are passed to pseudo satellite, pseudolite by fiber optic network, and Big Dipper pseudo satellite, pseudolite compatible receiver terminal finally completes the location compute of location-independent and colocated.
2. system according to claim 1, it is characterized in that, described ground pseudo satellite, pseudolite comprises 5 modules, control module, baseband signal generation module, radiofrequency signal generation module, pseudo-random pulse signal generation module and time and frequency standards signal generator module;
Wherein control module is responsible for receiving the parameter of PC, realizes the parameter configuration of each module, comprises the ranging code parameter configuration of baseband signal, the power setting of radiofrequency signal, door control unit time-hopping code generator are arranged, the configuration of pulse slot;
Baseband signal generation module utilizes base-band digital modulation technique, and in numeric field, complete data and the pseudo-code modulation of Big Dipper B1 and B3 signal, the symbolic information obtained is modulated to digital intermediate frequency baseband signal by DDS technology;
Radiofrequency signal generation module completes the variable frequency work of digital intermediate frequency to analog radio-frequency signal, meanwhile, is controlled the size of transmit signal power by programmable attenuator; Power controls to adopt digital power control and radio frequency analog signal power to control the mode combined;
Pseudo-random pulse signal generation module utilizes pseudo-noise code generator to produce pseudo-random pulse sequence, controls pulse pseudo satellite, pseudolite navigation signal when gate controlled switch is jumped according to corresponding slot table generation; Pseudo-random pulse signal generation technique need be adopted in order to produce accurate controlled pseudo-random pulse signal, comprising precise hard_drawn tuhes two aspects of the generation of pseudo-random pulse pattern and pseudo-random pulse signal; For pseudo-random pulse pattern generation technique, according to the cycle request of pseudo-random pulse, design corresponding pseudo-code generator; According to the slot requirements of design, the sequence pair total number of timeslots complementation utilizing corresponding code generator to produce obtains the position of this pulse signal; Generation for pseudo-random pulse signal is intended adopting controls in advance strategy, namely the pulse position of each yard of cycle generation is determined by the pulse position calculated in the previous code cycle, ensure real-time and the synchronism of pseudo-random pulse signal so to greatest extent, thus realize precise hard_drawn tuhes.
3. system according to claim 2, it is characterized in that, described time and frequency standards signal generator module is responsible for whole pseudolite systems and provides standard clock signal, meanwhile, completes the information interaction with Information Network tube hub; Clock frequency reference source is the core of pseudo satellite, pseudolite, and being responsible for provides stable and accurate clock needed for each module of system; In order to ensure the reliability of clock module, clock frequency reference source is intended employing 3 kinds of modes and is realized, and comprises optical fiber time frequency signal, internal reference source, external reference clock signal; Produce the clock signal of 10MHz high stability as reference clock source by fiber bit clock module, produce the frequency standard signal needed for each module by driving and frequency division; Wherein, the clock frequency reference source of 10MH is produced or unrestricted choice atomic frequency standard by the high steady constant temperature crystal provided for oneself in system.
4. system according to claim 1, it is characterized in that, the workflow of described ground pseudo satellite, pseudolite: first control module configures each cell parameters, baseband signal generation module adopts data and the pseudo-code modulation of digital modulation technique settling signal, obtain digital intermediate frequency baseband signal, then the frequency conversion of intermediate frequency to analog radio-frequency signal is completed by RF frequency signal generator, and the watt level that control transmits, pseudo-random pulse signal generator module produces random pulse sequence, control pulse pseudo satellite, pseudolite navigation signal when gate controlled switch is jumped by corresponding slot table generation, last by antenna transmission, whole process time and frequency standards module provides accurate clock signal for system.
5. system according to claim 2, it is characterized in that, it is complete in the digital baseband part of pseudo satellite, pseudolite that described digital power controls, the task that digital power controls is the satellite power according to setting, complete the control of satellite-signal power in digital baseband part, thus meet the controllable requirement of pseudo satellite, pseudolite emissive power;
The task that described radio frequency analog signal power controls has been the programed power control of channel radio frequency signal; Meanwhile, the harmonic power transmitted derives from the distortion of frequency mixer and amplifier, and system output power is less, and output stage adopts the linear power amplifier of low distortion, has good harmonic characteristic; Meanwhile, the outer harmonic wave of the method inhibition zone of wave filter and clutter is adopted in output stage; After wave filter, reach <40dB harmonics restraint degree; The source of clutter comprises introduce in the crosstalk of optical mixing process and Direct Digital signal generative process spuious; Clutter outside band is effectively suppressed by wave filter; For ensureing the clutter recognition performance of inband signaling, being designed by rational frequency, avoiding the crosstalk signal of optical mixing process to fall in signal band; If system needs 60dB spurious reduction, then DDS blocks rear phase place 10bit, if DDS block after phase place 11bit, then reach the phase place rejection of 66dB.
6. system according to claim 1, it is characterized in that, described ground monitoring station is connected to form successively by antenna, the first radio frequency unit, the first baseband signal processing unit and information process unit four parts; Ground monitoring station can receive simultaneously utilize local coordinate system, pseudo satellite, pseudolite coordinate and real-time monitored amount to complete timing tracking accuracy measurement between pseudo satellite, pseudolite, system health monitoring, monitoring station, ground receives Big Dipper satellite signal and generates difference information in real time simultaneously, then by data-interface, pseudo satellite, pseudolite observed quantity, pseudo satellite, pseudolite timing tracking accuracy, system health monitoring information and difference information is sent to operations control center;
Wherein said antenna receiving signal, the first radio frequency unit carries out filtering to signal, and amplify, described information process unit extracts original observed data, navigation message respectively from the first baseband signal processing unit, receives GNSS original observed data; Utilize original observed quantity completion system integrity monitoring and calculating; Carry out pseudorange One-Point Location and generate difference information in real time, last Output rusults is sent to ground base navigation information network operations control center.
7. system according to claim 1, it is characterized in that, described Big Dipper pseudo satellite, pseudolite compatible receiver terminal comprises Anneta module, the second radio frequency unit, the second baseband signal processing unit, navigation calculation module and user interface, Big Dipper satellite signal and Pseudolite signal can be received simultaneously, complete the catching of two kinds of navigation signals, follow the tracks of, demodulation, original observed quantity extract, possess location-independent and colocated function;
Described second radio frequency unit comprises each frequency low noise amplifier and receives down conversion module; Adopt radio frequency integrated chip and the miniaturization passive component of Highgrade integration, applied microwave multilayer microstrip-circuit technology, the height realized in the finite space is integrated; Second radio frequency unit adopts superhet architecture, to obtain splendid selectivity and sensitivity, applies multistage agc circuit simultaneously, to adapt to dynamic requirement, realizes receiving the selection of different frequent points, the function of AGC status monitoring;
Described second baseband signal processing unit is followed the tracks of by capture circuit, multi channel signals and is extracted circuit with demodulator circuit, basic observation, timing circuit, interface control circuit form, for completing Big Dipper satellite signal and Pseudolite signal fast Acquisition, tracking and demodulation coding function, extracting and exporting the original observation information of pseudorange, carrier phase, carrier doppler, navigation message; Dipper system location-independent and dipper system and pseudo satellite, pseudolite colocated is realized according to original observed quantity; Adopt real-time multi-task structure; Each task is separate, has respective treatment scheme respectively; Each task takes semaphore synchronization mechanism; Adopt dma mode to carry out data transmission, reduce the expense of CPU in transmission, improve data transmission efficiency and software processing capability.
8. system according to claim 7, it is characterized in that, in described second baseband signal processing unit, A/D sampled signal in capture circuit through digital quadrature down conversion, adopt multichannel time-domain parallel to be correlated with and the algorithm of frequency domain FFT, complete and ranging code phase place searched and the determination of carrier doppler; Multi channel signals follows the tracks of the demodulation that the track algorithm combined with demodulator circuit application FLL/PLL ring realizes tracking to carrier wave and navigation message, adopts the delay lock loop of photocarrier method to follow the tracks of spreading code; Basic observation extraction unit will complete the extraction of pseudorange, carrier phase and these basic observations of Doppler; Navigation message and observed quantity data deliver to big-dipper satellite positioning calculation unit by parallel interface; For overcoming multipath effect, adopt pulse signal form anti-multipath technology; By the analysis of paired pulses multipath signal, complete the research of ground pseudo satellite, pseudolite multipath signal time delay, amplitude and phase propetry and the impact of multipath pulse signals tracking performance.
9. system according to claim 1, it is characterized in that, described foundation navigation signal network operation administrative center is divided into business subsystem and supports subsystem, and wherein business subsystem comprises: system time difference solving unit, pseudo satellite, pseudolite time synchronizing unit, the process of pseudo satellite, pseudolite navigation task and administrative unit, navigation network information monitoring and assessment unit; Support subsystem comprises: communication supporter, calculating supporter, data storage cell, user interaction unit;
Described system time difference solving unit collects the Beidou satellite system time of each pseudo satellite, pseudolite time measurement result and the reception of importing into from ground monitoring station, calculate foundation navigation signal network and dipper system mistiming by system time difference solving technique, and result is sent into the process of pseudo satellite, pseudolite navigation task and administrative unit generates navigation message;
Described pseudo satellite, pseudolite time synchronizing unit carries out reduction process by the many groups pseudo satellite, pseudolite clock correction information obtained multiple monitoring receiver, when obtaining the unified pseudo satellite, pseudolite clock face of foundation navigation signal network;
The process of described pseudo satellite, pseudolite navigation task and administrative unit are responsible for controlling the management of the navigation task of all pseudo satellite, pseudolites of network internal, comprise generation navigation information, complete ephemeris computation, provide clocking error correction to broadcast pseudo satellite, pseudolite health status;
Described navigation network information monitoring and assessment unit complete Big Dipper foundation navigation signal network monitor and Performance Evaluation, the Monitoring Data that system utilizes monitoring station to obtain carries out Real-Time Monitoring and display to the pseudo satellite, pseudolite constellation state of whole foundation navigation signal network, aerial signal quality, navigation information state, obtains ground base navigation net service performance index by COMPREHENSIVE CALCULATING assessment.
10. system according to claim 9, it is characterized in that, described calculating supporter provides computational resource support to the various computation requirements required for business subsystem, comprises the server hardware calculating middleware, Geographic Information System (GIS) software and correspondence;
Described communication supporter provides communication resource support to the various transmission demands required for business subsystem, comprises function and the hardware environment thereof such as network data transceiver module, Network traffic control unit, as high speed fibre network, router;
Described user interaction unit adopts B/S or C/S structure, and friendly graphical interfaces, carries out bookkeeping to Big Dipper foundation navigation signal network;
The total data that described data storage cell real-time collecting is relevant with performance management; Format analysis and conversion are carried out to original performance data, preserves primary data information (pdi); Whole system controls relevant important operation log, record persistence, and can inquire about; There is provided syslog analysis, generating report forms function; Log Administration System is system trouble analysis, control analysis provides Data support.
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