CN104181550A - Common view time and frequency transmitting method based on BeiDou navigation satellite system - Google Patents

Common view time and frequency transmitting method based on BeiDou navigation satellite system Download PDF

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Publication number
CN104181550A
CN104181550A CN201410409512.3A CN201410409512A CN104181550A CN 104181550 A CN104181550 A CN 104181550A CN 201410409512 A CN201410409512 A CN 201410409512A CN 104181550 A CN104181550 A CN 104181550A
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China
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time
satellite
data
difference
beidou
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CN201410409512.3A
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CN104181550B (en
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王宏博
张升康
易航
王海峰
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Beijing Institute of Radio Metrology and Measurement
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Beijing Institute of Radio Metrology and Measurement
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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
    • G—PHYSICS
    • G04—HOROLOGY
    • G04R—RADIO-CONTROLLED TIME-PIECES
    • G04R20/00—Setting the time according to the time information carried or implied by the radio signal
    • G04R20/02—Setting the time according to the time information carried or implied by the radio signal the radio signal being sent by a satellite, e.g. GPS
    • G04R20/04—Tuning or receiving; Circuits therefor

Abstract

The invention discloses a common view time and frequency transmitting method based on the BeiDou navigation satellite system. According to the common view time and frequency transmitting method based on the BeiDou navigation satellite system, the time difference between the local time and the time of all tracking satellites, clock difference parameters in navigation messages, the parameters of the time delay of the ionized stratum and the time delay of the troposphere and elevation angle data are measured and extracted through a timing type BeiDou receiver, and the clock differences between the local time and tracking BeiDou satellite clocks are worked out; the difference between the local time and the time of the BeiDou navigation satellite system is worked out through preprocessing of original data and weighting of elevation angles of all the tracking satellites; the time of the navigation satellite system is used as a medium, through the short message communication function of BeiDou-1, comparison results of two common view stations are exchanged, so that the time difference of the two stations is obtained, and the relative frequency difference between the two stations is worked out. By the adoption of the technical scheme, the dependence existing when GPS is used for transmitting time can be overcome, and accurate time transmission is achieved through the BeiDou navigation satellite system; high-cost hardware support is not needed, operation is easy, long-time automatic operation can be achieved, and therefore labor cost and use cost are greatly reduced.

Description

A kind of common-view time Frequency Transfer method based on Beidou satellite navigation system
Technical field
The present invention relates to satellite navigation application, particularly relate to a kind of common-view time Frequency Transfer method based on Beidou satellite navigation system.
Background technology
Time, as one of seven fundamental physical quantities, has and can pass through the feature of the long-range propagation of electromagnetic wave mode.Split-second precision transmission is the important research direction of time-frequency metering field.Existing remote time Frequency Transfer mode mainly contains GPS and looks altogether method, gps carrier phase method and satellite two dimensional method.
GPS be take gps satellite as medium depending on method altogether, at two websites that carry out time transmission, utilizes GPS receiver collection comparison data, and afterwards by two places data exchange processing, the time that obtains is transmitted result.This method is the most universal a kind of remote time transmission method of countries in the world time-frequency laboratory applications, and cost is low, and data processing technique is simply ripe, but real-time is poor.
Gps carrier phase time TRANSFER METHOD also needs two websites that carry out time transmission by measurement type GPS receiver, to gather the gps carrier phase data of certain time length, precise ephemeris and the star clock data of utilizing IGS (International GNSS Service) to issue afterwards for 15 days, and antenna phase center coordinate accurately, carry out complicated Data Post, obtain the time difference of each station time and IGST, thereby transmit the time completing between station.This method data processing algorithm is complicated, and need to wait for IGS issue precise ephemeris, therefore also cannot complete real time data transmission.
Satellite two-way time transfer method general using geostationary orbit telstar, at two websites of the time of carrying out transmission, land station and Two Way Satellite Time Transfer, to modulator-demodular unit, carry out the long-range transmission of time via satellite.Due to the symmetry in electromagnetic wave two-way propagation path, can eliminate main time comparison error, the time that obtains in real time two places is transmitted result.This method real-time is good, and index is high, but cost is higher, needs two websites that carry out time transmission to set up satellite ground station, and buys special-purpose two-way time comparison modulator-demodular unit, simultaneously leased satellite channel.
In sum, GPS all cannot complete the real-time time depending on method and gps carrier phase method altogether and transmit, although and satellite two-way time transfer method can complete real-time time transmission, equipment complex and expensive, satellite channel lease expenses is very high.
Therefore, need to provide a kind of quality that can guarantee that real-time time transmits, again can be cost-saving, use simple time delivering method.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of common-view time Frequency Transfer method based on Beidou satellite navigation system, to solve in prior art, utilizes GPS cannot carry out the problem of real-time time transmission.
For solving the problems of the technologies described above, the present invention adopts following technical proposals.
A common-view time Frequency Transfer method based on Beidou satellite navigation system, the method step comprises
S1, utilize measurement type Beidou receiver receiving satellite signal, gather satellite ephemeris, pseudorange, star clock parameter and the atmospheric propagation delay parameter etc. of receiver output;
S2, the data that obtain according to step S1, try to achieve the data of the difference of each Satellite clock and local zone time, and as raw data;
S3, utilize the raw data in step S2, and adopt least square method to carry out linear fit to data, obtain each satellite time and local zone time in the time difference of comparing period mid point;
S4, calculate local zone time and Beidou satellite navigation system time in the time difference of comparing period mid point, and look altogether result as this locality;
Between S5, subscriber station, by Beidou satellite communication system, carry out local data exchange, and calculate clock correction and relative frequency difference between two users station.
Preferably, in described step S1, clock correction parameter comprises telegraph text data, delayed data and satellite altitude angular data.
Preferably, in described step S3, raw data is carried out to elimination of rough difference and smothing filtering.
Preferably, in described step S4, utilize and the data of each satellite are weighted to average method by satellite kind and elevation of satellite obtain the poor of the local zone time of midpoint and the time of Beidou satellite navigation system in comparison time.
Preferably, utilize formula calculate relative weighting, wherein, W pRNibe the relative weighting of i satellite time difference data, E pRNiit is i elevation of satellite.
6, common-view time Frequency Transfer method according to claim 1, is characterized in that, utilizes formula calculate two station frequency standards at τ the average relative frequency departure in the time period, wherein Δ T aB(t i) be t at a time irecord A, the two station time differences of B, Δ T aB(t i+ τ) be t i+ τ records the time difference at A, B two stations constantly.
Preferably, the method further comprises accumulation geostationary orbit satellite comparison data sample, and time comparison is optimized.
Beneficial effect of the present invention is as follows:
Technical scheme of the present invention can overcome the dependence of utilizing GPS passing time, transmits by the Beidou satellite navigation system time accurately of realizing; This method does not need expensive hardware supported, and easy operating can move for a long time automatically, greatly reduces labour and use cost.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail;
Fig. 1 illustrates the schematic diagram of a kind of common-view time Frequency Transfer method based on Beidou satellite navigation system of the present invention;
Fig. 2 illustrates the principle of work schematic diagram of the present embodiment.
Embodiment
Below in conjunction with one group of embodiment and accompanying drawing, the present invention is described further.
As shown in Figure 1, the invention discloses a kind of concrete steps based on Beidou satellite navigation system common-view time transmission method comprises:
The first step, collection be the data such as pseudorange, ephemeris, star clock parameter and atmospheric propagation delay parameter of type Beidou receiver output regularly
Utilizing Big Dipper Navsat to carry out in the process of time transmission, need to select regularly type Big Dipper receiving equipment to receive Big Dipper satellite signal, gather PRN numbering, time, pseudorange, ephemeris orbit parameter, the star clock parameter a0 of the tracking satellite of Beidou receiver output, a1, a2 and t0, ionosphere delay parameter and tropospheric delay parameter.
Second step, calculate the raw data of the difference of each tracking satellite star clock and local zone time
According to all data of extracting in the first step, resolve positioning equation, can calculate the raw data of local zone time and the difference of Big Dipper time.
The 3rd step, calculate each tracking satellite and local zone time in the mistiming of comparing period mid point
The raw data obtaining in second step is carried out to elimination of rough difference and smothing filtering, by least square method, carry out linear fit, obtain the mistiming of corresponding comparison time section mid point.
The 4th step, calculating local zone time and dipper system time are compared the time difference of period mid point, as this locality, look altogether result
The data of each tracking satellite are weighted on average by satellite kind and elevation of satellite, obtain the poor of the local zone time of comparison time section midpoint and Big Dipper time, as local Big Dipper common-view mode result.Relative weighting computing formula is as follows
W PRNi = 1 cos 2 ( E PRNi ) - - - ( 1 )
Wherein, W pRNiit is the relative weighting of i satellite time difference data;
E pRNiit is i elevation of satellite.
Its absolute weight can be obtained by following formula
W PRNi = W PRNi Σ W PRNi - - - ( 2 )
Between the 5th step, comparison station by Big Dipper short message swap data and calculate clock correction and relative frequency difference
Geostationary geosynchronous satellite in dipper system has short message communication capacity, between common-view mode land station, can exchange local Big Dipper common-view mode result by it.Local station is sent to distant station by our station comparison result through satellite, the comparison result that receiving remote station sends through satellite simultaneously.By formula (3) and (4), try to achieve the clock difference between our station and distant station.
As shown in Figure 2, A station and B station are respectively two land stations, by dipper system, depending on method, two places temporal frequency are compared and transmission altogether.A station utilizes respectively Research on passive BeiDou navigation position method with B station, calculates the poor of two stations and dipper system time.
Δ T A = T A - T BD Δ T B = T B - T BD - - - ( 3 )
Wherein, T afor the A station time;
T bfor the B station time;
T bDfor the dipper system time;
Δ T atime deviation for A station time and dipper system;
Δ T btime deviation for B station time and dipper system.
It is poor that two results that obtain in identical epoch or comparison time section are done, and can obtain for two station mistimings
ΔT AB＝T A-T B
＝(T A-T BD)-(T B-T BD) (4)
＝ΔT A-ΔT B
If t at a time irecording A, the two station time differences of B is Δ T aB(t i), after τ after a while, i.e. t ithe time difference that+τ records A, B two stations is constantly Δ T aB(t i+ τ), with following formula can obtain two station frequency standards at τ the average relative frequency departure in the time period:
f A - f B f = Δ T AB ( t i ) - Δ T AB ( t i + τ ) τ - - - ( 5 )
The 6th step, accumulation GEO satellite comparison data sample, the long-time result that is optimized of comparing
Due to GEO satellite be continuously visible, therefore respectively stand in to follow the tracks of the situation of interrupting can not occur in GEO satellite process.Therefore, can constantly accumulate the comparison data of GEO satellite reception passage.The comparison data of one group of GEO satellite of every increase, carry out data fitting one time.When its data sample is greater than after 1h, by quadratic fit, replace the linear fit in the 3rd step, the common-view time comparison result that can be optimized by the observation of longer time.
Below by one group of specific embodiment, the present invention will be further described:
In carrying out the process of Big Dipper common-view mode, need each comparison station to compare according to the comparison time table of prior formulation.For the ease of each station unified comparison period, each integral point hour of planning universal time (UTC time) is divided into three sections, and every section of comparison time is decided to be 20min.Like this, the comparison period of one day is 72.
Within each Big Dipper common-view mode period of upper step, collection local zone time per second and the time difference data of Big Dipper time.For the satellite of Continuous Tracking, 1200 data in each time can make full use of, and 1200 comparison data are one group.For the passage that need to switch tracking satellite, because receiver acquisition satellite-signal needs the regular hour, therefore, each need to be compared to the data of period front and back 2min and remove, there are 960 data each period like this.
For the data of each period, all need to calculate the comparison result of period mid point, corresponding time point is respectively UTC 10min hourly, 30min and 50min.
In sum, the hardware device cost that this method of the present invention relates to is low, and easy operating can move for a long time automatically, is convenient to promote the use of, and is transmitted and can be broken away from the dependence to GPS of America by the Beidou satellite navigation system time of carrying out of China.
Obviously; the above embodiment of the present invention is only for example of the present invention is clearly described; and be not the restriction to embodiments of the present invention; for those of ordinary skill in the field; can also make other changes in different forms on the basis of the above description; here cannot give all embodiments exhaustive, every still row in protection scope of the present invention of apparent variation that technical scheme of the present invention extends out or change that belong to.

Claims (7)

1. the common-view time Frequency Transfer method based on Beidou satellite navigation system, is characterized in that, the method step comprises
S1, utilize measurement type Beidou receiver receiving satellite signal, gather satellite ephemeris, pseudorange, star clock parameter and the atmospheric propagation delay parameter etc. of receiver output;
S2, the data that obtain according to step S1, try to achieve the data of the difference of each Satellite clock and local zone time, and as raw data;
S3, utilize the raw data in step S2, and adopt least square method to carry out linear fit to data, obtain each satellite time and local zone time in the time difference of comparing period mid point;
S4, calculate local zone time and Beidou satellite navigation system time in the time difference of comparing period mid point, and look altogether result as this locality;
Between S5, subscriber station, by Beidou satellite communication system, carry out local data exchange, and calculate clock correction and relative frequency difference between two users station.
2. common-view time Frequency Transfer method according to claim 1, is characterized in that, in described step S1, clock correction parameter comprises telegraph text data, delayed data and satellite altitude angular data.
3. common-view time Frequency Transfer method according to claim 1, is characterized in that, in described step S3, raw data is carried out to elimination of rough difference and smothing filtering.
4. common-view time Frequency Transfer method according to claim 1, it is characterized in that, in described step S4, utilize the data of each satellite are weighted to average method by satellite kind and elevation of satellite obtain the poor of the local zone time of midpoint and the time of Beidou satellite navigation system in comparison time.
5. common-view time Frequency Transfer method according to claim 4, is characterized in that, utilizes formula calculate relative weighting, wherein, W pRNibe the relative weighting of i satellite time difference data, E pRNiit is i elevation of satellite.
6. common-view time Frequency Transfer method according to claim 1, is characterized in that, utilizes formula calculate two station frequency standards at τ the average relative frequency departure in the time period, wherein Δ T aB(t i) be t at a time irecord A, the two station time differences of B, Δ T aB(t i+ τ) be t i+ τ records the time difference at A, B two stations constantly.
7. common-view time Frequency Transfer method according to claim 1, is characterized in that, the method further comprises accumulation geostationary orbit satellite comparison data sample, and time comparison is optimized.
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