CN102004258A - Time frequency transfer method and receiver based on multiple global navigation satellite system (GNSS) integration - Google Patents
Time frequency transfer method and receiver based on multiple global navigation satellite system (GNSS) integration Download PDFInfo
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Abstract
The invention provides a time frequency transfer receiver based on multiple global navigation satellite system (GNSS) integration, which comprises a plurality of GNSS receiving modules, an external clock source and a controller, wherein the controller uniformly synchronizes the reference times of the plurality of GNSS receiving modules to a local reference time frequency standard source to acquire a plurality of time frequency measuring signals of the plurality of different GNSSs, substitutes one or more measured values in measuring coarse codes, precise codes and carrier phases of each GNSS into an observation equation for processing to obtain the local reference time relative to each GNSS time, endows the local reference times relative to each GNSS time with corresponding weights, acquires the difference between the local reference time of a single station and a universal time coordinated (UTC) time after weighted average, and acquires the common-view data of the local single station after processing. The embodiment of the invention can carry out remote high-accuracy time frequency standard comparison by using a plurality of measuring signals of a plurality of free GNSSs, thereby realizing multiple GNSS integration and multiple measuring signal integration.
Description
Technical field
The present invention relates to temporal frequency collimation technique field, particularly a kind of temporal frequency transmission method and receiver that merges based on multiple GNSS system.
Background technology
Temporal frequency importance more and more highlights at present, is mainly reflected in field of space technology, metering field or the like, and the demand of frequency standard service time has appearred in therefore increasing place.But, because many time and frequency standards are not easy to move, and a lot of time and frequency standards exist and need continuous working, and therefore singularity such as should not cut off the power supply press for the method for seeking a kind of remote time Frequency Transfer and come these time and frequency standards are carried out remote calibration.
International frequently the control in the annual meeting in 1980, Allan has proposed the principle that GPS (Global Positioning System, GPS) looks the transmission of method time altogether first.GPS in 1985 altogether the method for looking to be used to remote time ratio right, participate in TAI (Temps Atomique International, International Atomic Time) and calculate.From early 1990s, the GPS method of looking altogether begins to be used widely.1994, on behalf of gps time, Allan transmit standard group (GGTTS), on periodical MetroLogia, delivered " GPS timing receiver software standardization technical manual ", unified to look altogether the form of receiver software processing process and single station observation file, looked comparison accuracy altogether with further raising.It mainly is U.S. AOA company that early stage GNSS temporal frequency is transmitted the receiver manufacturer.
Since nineteen ninety-five, (the Bureau International des Poids et Mesures of International Bureau of Wieghts and Measurements, BIPM) portion is when calculating TAI the time, rely on each time breadboard single-frequency single channel GPS to look receiver secondary tracking satellite every days 48 altogether, the observational data of more than 200 atomic clock in about 50 time laboratories, the whole world, by looking comparison altogether, unified reduction becomes UTC-UTC (k), wherein, k refers to each time laboratory.
In recent years, GPSC/A sign indicating number, P3 sign indicating number multi-channel measurement, GLONASS (GLObal NAvigation SatelliteSystem, russian system) P sign indicating number is looked altogether, occurs in succession.Make that not only look comparison altogether carries out continuously, and increased the observation data amount, improved comparison accuracy, what all there were GPSC/A sign indicating number, a P3 sign indicating number in companies such as Septentrio, AOS and Dicom looks receiver altogether.When one of purpose of gps time Frequency Transfer receiver is to obtain local reference clock and gps system or other reference time system comparison result, mainly by following two kinds of mode of operations.As shown in Figure 1, be existing mode of operation synoptic diagram.
Wherein, mode of operation 1 is meant that receiver directly locks onto local reference time frequency source by self function, then having obtained the GPS observed quantity by receiver is benchmark with local reference time frequency source, in the time of can directly obtaining local reference time frequency source and gps system by data processing or other reference time system comparison result; Mode of operation 2 is meant that receiver can not or directly not lock onto local zone time frequency reference source, then need to measure the relation of local reference time frequency source and receiver internal clocking by time-interval counter, again by obtain indirectly after the data processing when reference time frequency source and gps system or other reference time system comparison result.Mode of operation 1 is with respect to the easy more easy realization of mode of operation 1, and because required instrument has still less been introduced error still less, obtained the more result of good quality, but it has certain requirement to receiver function; Mode of operation 2 its performances often are limited by the performance of time-interval counter.Wherein, the product of Septentrio company is based on mode of operation 1, and the product of Dicom and AOS based on mode of operation 2.
The shortcoming that prior art exists is:
1, present temporal frequency is transmitted receiver and all is to use single GNSS system to produce the temporal frequency comparison result of system separately, data are not merged, this reliability for the result is a huge test, in case certain systemic breakdown, to cause important adverse effect, the temporal frequency that develops other following possible GNSS system bases is simultaneously transmitted no less important, and the fusion of multisystem can improve the measuring accuracy and the functional reliability of receiver greatly.
2, Beidou satellite navigation system (BeiDou (COMPASS) Chinese is called for short ' Big Dipper ') is the Chinese independent development capability of implementing, the GPS (Global Position System) of independent operating, possess functions such as navigation, location and time service, China pays much attention to and is making great efforts always explore and develop the satellite navigation system that has independent intellectual property right, because its continuous development, utilizing COMPASS to carry out the temporal frequency transmission has become a kind of inexorable trend, but does not also transmit receiver based on the thick sign indicating number of COMPASS (two generations), smart sign indicating number and carrier phase temporal frequency at present.In addition, develop other following possible GNSS (Global Navigation Satellite System, GLONASS (Global Navigation Satellite System)) temporal frequency of system's base is transmitted no less important, and the fusion of multisystem can improve the measuring accuracy and the functional reliability of receiver greatly.
3, since present various GNSS temporal frequencies transmit receivers all only generate local with reference to the comparison result of GNSS system reference time, as the result of the local reference of need comparison with the opposing party (long-range) reference, must two number formularies handle and to realize, do not realize this function automatically but still there is the receiver folk prescription according to being aggregated into the place line data of going forward side by side.
Summary of the invention
Purpose of the present invention is intended to solve above technological deficiency at least, has proposed a kind of temporal frequency transmission method and receiver that merges based on multiple GNSS system.
For achieving the above object, one aspect of the present invention has proposed a kind of temporal frequency that merges based on multiple GNSS system and has transmitted receiver, comprise: a plurality of Global Navigation Satellite System (GNSS) receiver modules are used to receive the time and frequency measurement signal of multiple different GNSS system; External clock reference is used to described a plurality of GNSS receiver module that frequency signal and 1PPS signal are provided; Controller, be used for unified this locality reference time frequency standard sources that is synchronized to of the reference time of a plurality of GNSS receiver modules, obtain the multiple time and frequency measurement signal of a plurality of different GNSS system, and with the thick sign indicating number of each GNSS system, one or more measuring amount substitution observation equations in smart sign indicating number and the carrier phase measurement are handled the local reference time when obtaining with respect to each GNSS system, and the local reference time to respect to each GNSS system the time give corresponding weights, obtain the poor of single local reference time of standing and UTC time after the weighted mean, finally obtain local single station through CGGTTS (CCTF Group on GNSS Time Transfer Standards, the international temporal frequency GNSS of the advisory committee time is transmitted standard group) data processing and look data altogether.
The present invention has also proposed a kind of temporal frequency transmission method that merges based on multiple GNSS system on the other hand, may further comprise the steps: the reference time of a plurality of GNSS receiver modules unifiedly is synchronized to local reference time frequency standard sources to obtain the multiple time and frequency measurement signal of a plurality of different GNSS system; One or more measuring amount substitution observation equations in the thick sign indicating number of each GNSS system, smart sign indicating number and the carrier phase measurement are handled local reference time when obtaining with respect to each GNSS system, and the local reference time to respect to each GNSS system the time give corresponding weights, obtain the poor of single local reference time of standing and UTC time after the weighted mean and after carrying out the CGGTTS data processing, obtain local single station to look data altogether.
The embodiment of the invention can utilize the multiple measuring-signal of multiple free GNSS system to carry out the comparison of remote high-precision time and frequency standard, adopts mode of operation 1 simultaneously, thereby has realized that many GNSS system merges, the fusion of multiple measuring-signal.In addition, the embodiment of the invention can be distributed different weights to the local reference time of various measuring methods and the acquisition of each GNSS system, thereby can further improve the precision that DATA REASONING is looked at single station altogether.Secondly, in a preferred embodiment of the invention, also can obtain the single station of remote parties automatically and look data altogether, and generate calibration or comparison report.
Aspect that the present invention adds and advantage part in the following description provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Description of drawings
Above-mentioned and/or additional aspect of the present invention and advantage are from obviously and easily understanding becoming the description of embodiment below in conjunction with accompanying drawing, wherein:
Fig. 1 is existing mode of operation synoptic diagram;
Fig. 2 is that the temporal frequency that merges based on multiple GNSS system of the embodiment of the invention is transmitted receiver structure figure;
Fig. 3 is the temporal frequency transmission method process flow diagram that merges based on multiple GNSS system of the embodiment of the invention.
Embodiment
Describe embodiments of the invention below in detail, the example of described embodiment is shown in the drawings, and wherein identical from start to finish or similar label is represented identical or similar elements or the element with identical or similar functions.Below by the embodiment that is described with reference to the drawings is exemplary, only is used to explain the present invention, and can not be interpreted as limitation of the present invention.
Because in recent years, the development of GNSS measuring technique, the present invention proposes a kind of calibration of remote high-precision time and frequency standard and comparison receiver of the fusion based on the multiple measuring technique in multiple GNSS system and the every kind of GNSS system (thick sign indicating number, smart sign indicating number and carrier phase etc.), thereby realize that many measuring-signals merge to improve the measuring accuracy and the reliability of receiver.In addition, the present invention adopts network transmission technology to download reference side and looks data altogether some key technical index of time and frequency standard (comprising atomic clock and clock group etc.) are carried out high precision remote calibration and comparison, wherein, comprise moment accuracy, moment degree of stability, frequency accuracy, reach frequency stability, and generation is calibrated and compared and report and be sent to reference side automatically.
As shown in Figure 2, transmit receiver structure figure for the temporal frequency that merges based on multiple GNSS system of the embodiment of the invention.This receiver comprises a plurality of GNSS receiver modules 100, external clock reference 200 and controller 300.Wherein, a plurality of GNSS receiver modules 100 are used to receive the frequency time signal of different GNSS system, at least comprise two kinds in gps system, GLONASS system and the dipper system in the present invention, thereby improve the reliability of operation of receiver, preferably include the dipper system of China's independent intellectual property right.Certainly need be in this explanation be that the present invention is also applicable to the navigational system of Future Development.External clock reference 200 is used to a plurality of GNSS receiver modules 100 that frequency signal and 1PPS signal are provided.Controller 300 is used for unified this locality reference time frequency standard sources that is synchronized to of the reference time of a plurality of GNSS receiver modules, obtain the multiple time and frequency measurement signal of a plurality of different GNSS system, and with the thick sign indicating number of each GNSS system, one or more measuring amount substitution observation equations in smart sign indicating number and the carrier phase measurement are handled the local reference time when obtaining with respect to each GNSS system, and the local reference time to respect to each GNSS system the time give corresponding weights, obtain the poor of single local reference time of standing and UTC time after the weighted mean, finally obtain local single station through the CGGTTS data processing and look data altogether.
In embodiments of the present invention, also can be corresponding to troposphere, ionosphere, sagnec, solid tide, relativistic effect equal error compensate, measure and deduct retardations such as cable and adapter, receiver, antenna, resolve the clock correction value that observation equation obtains both sides GNSS receiver afterwards again, thereby improve calculation accuracy.
In a preferred embodiment of the invention, controller 300 also be used for the thick sign indicating number to each GNSS system, smart sign indicating number and carrier phase measurement one or more handle local reference time with the corresponding measuring method that obtains each GNSS system, and give corresponding weights to the local reference time of every kind of measuring method, thereby after weighted mean, obtain the local reference time of each GNSS systematic survey.
In one embodiment of the invention, ask the weights of the local reference time correspondence when obtaining reciprocal with respect to each GNSS system according to the standard deviation of the historical measurement data in the certain hour section that obtains of each GNSS system of statistics; Corresponding weights of local reference time when perhaps, obtaining with respect to each GNSS system with the uncertainty of the difference of universal time UTC according to each GNSS system time of announcing among the moon border communique Cir.T of International Bureau of Wieghts and Measurements; Perhaps, by the weights of the two local reference time correspondence when obtaining with respect to each GNSS system.For example, suppose to comprise gps system, GLONASS system and dipper system in the receiver in the present invention that the analysis through above-mentioned for the three respectively distributes 32%, 34% and 34% weights, and is weighted on average according to the weights of giving.
In another embodiment of the present invention, the standard deviation of the historical measurement data of the certain hour section that obtains according to the thick sign indicating number of statistics, smart sign indicating number and carrier phase measurement method ask reciprocal obtain every kind of measuring method with respect to each GNSS system the time the corresponding weights of local reference time institute; Perhaps, obtain the corresponding weights of local reference time institute of every kind of measuring method according to the uncertainty of the thick sign indicating number of announcing among the moon border communique Cir.T of International Bureau of Wieghts and Measurements, smart sign indicating number and carrier phase measurement method; Perhaps, by the two corresponding weights of local reference time institute in conjunction with every kind of measuring method of acquisition.For example, suppose to adopt thick sign indicating number, smart sign indicating number and carrier phase measurement method to measure in the receiver in the present invention, the analysis through above-mentioned for the three respectively distributes 30%, 36% and 34% weights, and is weighted on average according to the weights of giving.
In embodiments of the present invention, receiver also can show receiver location, local zone time, tracking satellite relevant information, for example pseudo-random code sequence, the elevation angle, position angle, channel status, signal quality, signal to noise ratio (S/N ratio), satellite time, satellite ephemeris etc.In addition, also can show temporal information, for example when UTC (Temps Universel Coordonn é), GPST, GLONASS system, BDT etc.Also can show local with reference to the time during with UTC, GPST, GLONASS system, time difference of BDT, show real-time relative frequency deviation, the demonstration real-time positioning information.In addition, also event memory data and observation data are stored as CGGTTS form, RINEX form to the receiver of the embodiment of the invention simultaneously.
In a preferred embodiment of the invention, this receiver also comprises network communication module, is used for downloading automatically the single station of remote parties and looks data altogether, for example by modes such as FTP, HTTP, telnet.Local or Remote side is stored as the set form data with observation data, receiver is by the particular network transmission mode, FTP for example, HTTP, telnet etc. download remote parties temporal frequency Data transmission automatically, and handle the time difference (accuracy constantly) that obtains both sides' frequency standard, and further obtain frequency difference (frequency accuracy), and moment degree of stability and frequency stability, finish calibration or the comparison for the treatment of the alignment time frequency standard, and with diagramatic way show local with reference to single station look altogether the result and with distant station comparison data, and the storage corresponding document, generate calibration or comparison report.
As shown in Figure 3, the temporal frequency transmission method process flow diagram that merges based on multiple GNSS system for the embodiment of the invention may further comprise the steps:
Step S301 is with unified this locality reference time frequency standard sources that is synchronized to of the reference time of a plurality of GNSS receiver modules.
Step S302 obtains the multiple time and frequency measurement signal of a plurality of different GNSS system.For example, obtain the time and frequency measurement signal of gps system, GLONASS system and dipper system simultaneously.
Step S303, one or more measuring amount substitution observation equations in the thick sign indicating number of each GNSS system, smart sign indicating number and the carrier phase measurement are handled local reference time when obtaining with respect to each GNSS system, in embodiments of the present invention, also need, solid tide corresponding, relativistic effect error etc. to compensate to troposphere, ionosphere, sagnec, and measure and retardations such as deduction cable and adapter, receiver, antenna, resolve the clock correction value that observation equation obtains both sides GNSS receiver; And the local reference time when obtaining with respect to each GNSS system for every kind of measuring method give corresponding weights, obtain the local reference time of each GNSS system after the weighted mean, the distribution of every kind of metering system weights does not repeat them here referring to above description.
Step S304, the local reference time to respect to each GNSS system the time is given corresponding weights, obtains the poor of local reference time and UTC after weighted mean.Equally, the weights of every kind of GNSS system distribute referring to above description.
Step S305 obtains local single station and looks data altogether after the CGGTTS data processing.
Step S306 downloads the single station of remote parties automatically and looks data altogether, for example, downloads by modes such as FTP, HTTP, telnet.
Step S307, look data altogether according to the single station of remote parties and look the time difference, frequency difference, moment degree of stability and the frequency stability that data obtain both sides' frequency standard altogether with local single station, finishing calibration or the comparison for the treatment of the alignment time frequency standard, and generate calibration or comparison report.
The embodiment of the invention can utilize the multiple measuring-signal of multiple free GNSS system to carry out the comparison of remote high-precision time and frequency standard, adopts mode of operation 1 simultaneously, thereby has realized that many GNSS system merges, the fusion of multiple measuring-signal.In addition, the embodiment of the invention can to obtain by various measuring methods and each GNSS system with respect to each GNSS system the time the local reference time distribute different weights, thereby can further improve the measuring accuracy that data are looked at single station altogether.Secondly, in a preferred embodiment of the invention, also can obtain the single station of remote parties automatically and look data altogether, and generate calibration or comparison report.
Although illustrated and described embodiments of the invention, for the ordinary skill in the art, be appreciated that without departing from the principles and spirit of the present invention and can carry out multiple variation, modification, replacement and modification that scope of the present invention is by claims and be equal to and limit to these embodiment.
Claims (10)
1. a temporal frequency that merges based on multiple GNSS system is transmitted receiver, it is characterized in that, comprising:
A plurality of global navigation satellite system GNSS receiver modules are used to receive the frequency time signal of a plurality of different GNSS system;
External clock reference is used to described a plurality of GNSS receiver module that frequency signal and 1PPS signal are provided; With
Controller, be used for unified this locality reference time frequency standard sources that is synchronized to of the reference time of a plurality of GNSS receiver modules, to obtain the multiple time and frequency measurement signal of a plurality of different GNSS system, and with the thick sign indicating number of each GNSS system, one or more measuring amount substitution observation equations in smart sign indicating number and the carrier phase measurement are handled the local reference time when obtaining with respect to each GNSS system, and the local reference time to respect to each GNSS system the time give corresponding weights, obtain the poor of single local reference time of standing and UTC time after the weighted mean, finally obtain local single station through the CGGTTS data processing and look data altogether.
2. the temporal frequency that merges based on multiple GNSS system as claimed in claim 1 is transmitted receiver, it is characterized in that,
Ask the weights of the local reference time correspondence when obtaining reciprocal with respect to each GNSS system according to the standard deviation of the historical measurement data in the certain hour section that obtains of each GNSS system of statistics;
Corresponding weights of local reference time when perhaps, obtaining with respect to each GNSS system with the uncertainty of the difference of universal time UTC according to each GNSS system time of announcing among the moon border communique Cir.T of International Bureau of Wieghts and Measurements;
Perhaps, by the combine weights of the local reference time correspondence that obtains each GNSS system of said two devices.
3. the temporal frequency that merges based on multiple GNSS system as claimed in claim 1 is transmitted receiver, it is characterized in that, also comprise, the local reference time of the corresponding measuring method when obtaining with respect to each GNSS system handled one or more measuring amount substitution observation equations in the thick sign indicating number of each GNSS system, smart sign indicating number and the carrier phase measurement by described controller, and give corresponding weights, the local reference time when obtaining after the weighted mean to the local reference time of every kind of measuring method with respect to each GNSS system.
4. the temporal frequency that merges based on multiple GNSS system as claimed in claim 3 is transmitted receiver, it is characterized in that,
The standard deviation of the historical measurement data of the certain hour section that obtains according to the thick sign indicating number of statistics, smart sign indicating number and carrier phase measurement method is asked the corresponding weights of local reference time institute that obtain every kind of measuring method reciprocal;
Perhaps, obtain the corresponding weights of local reference time institute of every kind of measuring method according to the uncertainty of the thick sign indicating number of announcing among the moon border communique Cir.T of International Bureau of Wieghts and Measurements, smart sign indicating number and carrier phase measurement method;
Perhaps, the corresponding weights of local reference time institute that combine and obtain every kind of measuring method by said two devices.
5. the temporal frequency that merges based on multiple GNSS system as claimed in claim 1 is transmitted receiver, it is characterized in that, also comprises:
Network communication module is used for downloading automatically the single station of remote parties and looks data altogether;
Described controller, also be used for looking data altogether and look the time difference, frequency difference, moment degree of stability and the frequency stability that data obtain both sides' reference time frequency standard altogether with local single station according to the single station of remote parties, finishing the calibration for the treatment of the alignment time frequency standard, and generate calibration or comparison report.
6. a temporal frequency transmission method that merges based on multiple GNSS system is characterized in that, may further comprise the steps:
Reference time of a plurality of GNSS receiver modules unifiedly is synchronized to local reference time frequency standard sources, to obtain the time and frequency measurement signal of a plurality of different GNSS system;
One or more measuring amount substitution observation equations in the thick sign indicating number of each GNSS system, smart sign indicating number and the carrier phase measurement are handled, and be the local reference time that every kind of measuring method obtains to give corresponding weights, the local reference time when obtaining after the weighted mean with respect to each GNSS system;
The local reference time to respect to each GNSS system the time is given corresponding weights, obtains the poor of local reference time at single station and UTC time after weighted mean; With
After carrying out the CGGTTS data processing, obtain local single station and look data altogether.
7. the temporal frequency transmission method that merges based on multiple GNSS system as claimed in claim 6 is characterized in that, also comprises:
Automatically download the single station of remote parties and look data altogether; With
Look data and local single station altogether according to the single station of remote parties and look data altogether and obtain the time difference, frequency difference of both sides' reference time frequency standard, degree of stability and frequency stability constantly, finishing the calibration for the treatment of the alignment time frequency standard, and generate calibration or comparison report.
8. the temporal frequency transmission method that merges based on multiple GNSS system as claimed in claim 6 is characterized in that, the described local reference time that obtains for every kind of measuring method gives corresponding weights and specifically comprises:
The standard deviation of the historical measurement data of the certain hour section that obtains according to the thick sign indicating number of statistics, smart sign indicating number and carrier phase measurement method is asked the corresponding weights of local reference time institute that obtain every kind of measuring method reciprocal;
Perhaps, obtain the corresponding weights of local reference time institute of every kind of measuring method according to the uncertainty of the thick sign indicating number of announcing among the moon border communique Cir.T of International Bureau of Wieghts and Measurements, smart sign indicating number and carrier phase measurement method;
Perhaps, the corresponding weights of local reference time institute that combine and obtain every kind of measuring method by said two devices.
9. the temporal frequency transmission method that merges based on multiple GNSS system as claimed in claim 6 is characterized in that, the local reference time to respect to each GNSS system the time gives corresponding weights and specifically comprises:
Ask the weights of the local reference time correspondence when obtaining reciprocal with respect to each GNSS system according to the standard deviation of the historical measurement data in the certain hour section that obtains of each GNSS system of statistics;
Corresponding weights of local reference time when perhaps, obtaining with respect to each GNSS system with the uncertainty of the difference of universal time UTC according to each GNSS system time of announcing among the moon border communique Cir.T of International Bureau of Wieghts and Measurements;
Perhaps, by the combine weights of the local reference time correspondence when obtaining of said two devices with respect to each GNSS system.
10. the temporal frequency transmission method that merges based on multiple GNSS system as claimed in claim 6 is characterized in that, also comprises:
, solid tide corresponding to troposphere, ionosphere, sagnec, relativistic effect error compensate, and measure and the retardation of deduction cable and adapter, receiver, antenna.
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| CN102540211A (en) * | 2011-12-22 | 2012-07-04 | 成都金本华科技有限公司 | BD-1 (Big Dipper No. 1) satellite multiple crystal oscillator time service system and method thereof |
| CN102590836A (en) * | 2012-01-10 | 2012-07-18 | 中国计量科学研究院 | Time-frequency transfer data acquisition and processing system based on global navigation satellite systems |
| CN102890279A (en) * | 2011-07-20 | 2013-01-23 | 中国科学院电子学研究所 | Method for implementing precise nanosecond time synchronization by virtue of global positioning system |
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