CN105911568A - Ground local station timing system based on multiple Beidou satellites - Google Patents
Ground local station timing system based on multiple Beidou satellites Download PDFInfo
- Publication number
- CN105911568A CN105911568A CN201610229882.8A CN201610229882A CN105911568A CN 105911568 A CN105911568 A CN 105911568A CN 201610229882 A CN201610229882 A CN 201610229882A CN 105911568 A CN105911568 A CN 105911568A
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- China
- Prior art keywords
- local station
- big dipper
- time
- atomic clock
- ground
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
- G01S19/25—Acquisition or tracking or demodulation of signals transmitted by the system involving aiding data received from a cooperating element, e.g. assisted GPS
- G01S19/256—Acquisition or tracking or demodulation of signals transmitted by the system involving aiding data received from a cooperating element, e.g. assisted GPS relating to timing, e.g. time of week, code phase, timing offset
-
- 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
-
- G—PHYSICS
- G04—HOROLOGY
- G04R—RADIO-CONTROLLED TIME-PIECES
- G04R40/00—Correcting the clock frequency
- G04R40/06—Correcting the clock frequency by computing the time value implied by the radio signal
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- General Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Electric Clocks (AREA)
Abstract
The invention relates to a ground local station timing system based on multiple Beidou satellites. The ground local station timing system comprises a ground local station which is connected with a first Beidou satellite, a second Beidou satellite and a third Beidou satellite through a wireless signal. The ground local station comprises a receiver, a high-stability atomic clock and a timing correction module. The high-stability atomic clock is wirelessly connected with the receiver. The receiver is connected with the timing correction module. Compared with the prior art, the ground local station timing system is advantageous in that simple structure and reasonable design are realized; navigation precision can be effectively improved; effects of factors of gravitational potential change caused by earth tide and the like in navigation through the satellite signal to the atomic clock can be prevented. The ground local station timing system has high practicability.
Description
Technical field
The present invention relates to Position Fixing Navigation System field, particularly relate to local station, ground based on the many stars of Big Dipper time dissemination system.
Background technology
One of spaceborne Main Means having become China's navigation time Frequency Transfer of the Big Dipper at present, due to multimode navigation system
Deepening continuously of system research, China's Beidou navigation satellite network gradually perfects, and various global navigational satellite system is combined in the future
Hot fields.The Pseudo-Random Noise Code that GLONASS satellite is launched is identical, and the frequency of different satellite launchs is different, in order to distinguish not
Same satellite, i.e. frequency division multiple access.Atomic clock (atomic time frequency standard) is the primary condition of human sciences's technical activity.Time
The raising of frequency measurement accuracy and precision, will fundamentally change a series of great natural science and the face of application technology
Looks.On basic scientific research, as the checking of general theory of relativity, the anisotropic measurement of the light velocity, the Gradient of Gravitation measure, atom thing
The reason time dependent measurements of constant etc., are required for the timing criteria of precision.Spacelab and space station construction are that China carries
The pith of people's space program, from the point of view of load volume weight and space station run track, high-precision spatial cold atomic clock is fitted
Cooperation is a payload of space station.As core technology and the key content of placement technology, atomic clock in high precision
Research seem more important.Research based on international space stage space cold atomic clock, except European Space Agency ACES
Outside (Atomic Clock Ensemble in Space) project plan is launched for 2013, once there was PARCS in the U.S.
(PrimaryAtomic Reference Clock in Space), RACE(RubidiumAtomic Clock
The project such as Experiment), but due to U.S. spaceflight strategy change, these projects are suspended at present, but also have funds in a small amount
Continue to support.China is the most carrying out space cold atomic clock project, these project implementations, will play Time and frequency standard research
Opening new direction, the accuracy of timekeeping of the mankind will improve further, and atomic clock and temporal frequency transmission technology will be more in high precision
Serve well third generation Position Fixing Navigation System in the future.It addition, a new generation's light clock is likely to be breached 10-17 ~ 10-18 degree of stability,
For the atomic clock of such precision, tide etc. has influence on the factor of gravitational potential change and has become the impact of atomic clock degree of stability
Very important, the gravitation frequency displacement more accurately measuring atomic clock by space microgravity environment atomic clock will be the most necessary.
Summary of the invention
The invention aims to overcome the deficiencies in the prior art, it is provided that local station, ground based on the many stars of the Big Dipper is awarded
Time system.
The present invention is to be achieved through the following technical solutions:
Local station, ground based on the many stars of Big Dipper time dissemination system, including local station, ground, local station, described ground is respectively and the Big Dipper
Star one, the Big Dipper two, the Big Dipper three are connected by wireless signal.The war of described ground local include receiver, high steady atomic clock and
Time service correcting module forms；The steady atomic clock of described height and receiver wireless connections, described receiver and time service correcting module connect；
Local signal is synchronized local residual error data and passes to time service correcting module by the steady atomic clock of described height；Described receiver accepts the Big Dipper
Data are uploaded by star system reference time and time frequency ratio；The steady atomic clock of described height provides for receiver when synchronizing accurately
Between signal；Described receiver and the steady atomic clock of height are positioned at same geographical position.
Further, respective receiver is synchronized to the external reference source of this locality (i.e. by described temporal frequency transmission both sides
High steady atomic clock) on, both sides record the satellite system of synchronization and now survey data, respectively obtain local zone time frequency by calculating
Standard and the time difference of satellite system, be i.e. two places temporal frequency transmission results.If receiver is under the synchronization of external reference source,
The local reference time standard obtained is respectively T0, and residual error is respectively L, and it is synchronization with external reference source that residual error reflects receiver
Effect, its value L is the smaller the better, if now receiver is all synchronized to external reference source, then has L0.
Time base reference signal T1, T2, the T3 of each satellite base station in space being directed in Fig. 1, according to Fig. 2, we can obtain
Enter into time service correcting module Zhong tri-tunnel correction signal F1, F2, F3 to be respectively as follows:
F1=(T0-L)-T1
F2=(T0-L)-T2
F3=(T0-L)-T3
Notice that Fig. 1 we have found that should be noted that at 2: one, respective communication are based on earth station and space station；Two, each
It is positioned at the difference coordinate of space from Big Dipper Aerospace Satellite.The impacts such as the atomic clock in Beidou satellite system has high accuracy, tide
To gravitational potential change factor the impact of atomic clock degree of stability has been become very important, we must deduct due to gravitational potential
The change of the north half satellite system atomic frequency that change causes.According to the Einsteinian principle of equal effects, be in two different
Radiation source in gravitational potential U1 and U2 has certain radiation frequency displacement relative to the radiation frequency of observer, frequency shift amount:
Δ f/f=-Δ U/C2 (1)
Wherein Δ U=U1-U2 represents the difference of two gravitational potentials, C is the light velocity.
So specific to our system, two different gravitational potentials i.e. refer to each space Big Dipper described in we Fig. 1
Base station is relative to the gravitational potential of ground base station；The local station, ground that radiation source is equivalent in we Fig. 1.Concrete measurement to depend on
Lai Yu is carried in the gravitational potential measuring instrument on the satellite of Big Dipper base station, space, and its measuring principle is as follows:
When satellite moves to 1(2 at ground surface respectively) outer tangent line L1(L2) vertical line D1(D2) place's extended line 1 district (2nd district)
In the range of time, measure corresponding gravitational field size U1(U2 by spaceborne gravitational potential measuring instrument), utilize formula (1) that 1 can be calculated
The gravitation frequency shift amount Δ f/f in district and 2nd district.It is applied in our system, it is possible to obtain the Big Dipper 1 in Fig. 1, the Big Dipper 2, north
Gravitation frequency shift amount at bucket star 3, we are designated as W1, W2, W3.Three tunnels of Fig. 2 time service correcting module substituting into above-mentioned acquisition again are repaiied
In positive signal, can obtain:
F1=(T0-L)-(T1-W1)
F2=(T0-L)-(T2-W2)
F3=(T0-L)-(T3-W3)
For in above formula, F1, F2, F3 refer to be directed to different space the Big Dipper 1,2,3, the precision in Fig. 2 in traditional definition
Time service export, here in order to make this accurate time transmission output in " accurate " two word more meet literal definition, we count again with
Drag improves precision further, in the algorithm of its core time service correcting module in fig. 2, and depends on above-mentioned acquisition
Revise signal F1, F2, F3.Specific as follows:
Due to above-mentioned theory three space the Big Dipper based on local station, a certain ground Yu Zhong You fixed position, space relation, we
Three satellites being intentionally chosen in earth direction of rotation from West to East, so the most above-mentioned correction signal F1, F2, F3 exist
Certain relation.In order to preferably quantify and judge the relation of three correction value changes, we introduce a variable Y=(F2-
The ratio of F1)/(F3-F2).It is referred to as actual ratio Y1, the ratio calculated according to theory according to the ratio that correction value actual value calculates
Value is referred to as theoretical ratio Y0(this ratio in actual system and is set to 0.47).
Compared with prior art, the invention has the beneficial effects as follows: present configuration is simple, reasonable in design, it is possible to effectively
Improve the precision of navigation, it is to avoid navigation Satellite signal is had influence on factor that gravitational potential changes to atomic clock by earth tide etc.
Impact, there is good practicality.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention；
Fig. 2 is ground local war structure chart in the present invention；
Fig. 3 be in the present invention measurement data satellite around earth trajectory diagram；
Fig. 4 is theory-actual measurement effect comparison chart in the present invention；
Fig. 5 is the first policy system Q-value design sketch in the present invention；
Fig. 6 is the second policy system Q-value design sketch in the present invention.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, right
The present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, and
It is not used in the restriction present invention.
Referring to Fig. 1-6, Fig. 1 is the structural representation of the present invention；Fig. 2 is ground local war structure chart in the present invention；Fig. 3
For measurement data satellite in the present invention around earth trajectory diagram；Fig. 4 is theory-actual measurement effect comparison chart in the present invention；Fig. 5
For the policy system Q-value design sketch of embodiment in the present invention；Fig. 6 is the policy system Q-value effect of another embodiment in the present invention
Figure.
Local station, ground based on the many stars of Big Dipper time dissemination system, including local station, ground, local station, described ground respectively and
The Big Dipper one, the Big Dipper two, the Big Dipper three are connected by wireless signal.The local war of described ground includes receiver, high steady atom
Clock and time service correcting module composition；The steady atomic clock of described height and receiver wireless connections, described receiver and time service correcting module
Connect；Local signal is synchronized local residual error data and passes to time service correcting module by the steady atomic clock of described height；Described receiver connects
By the Big Dipper system reference time and time frequency ratio, data are uploaded；The steady atomic clock of described height provides accurate for receiver
Lock in time signal；Described receiver and the steady atomic clock of height are positioned at same geographical position.
As one embodiment of the invention, in actual emulation sampling system, we use t=1 second interval time to carry out
The sampling of 25 days, obtains sample effect as shown in Figure 4: from fig. 4, it can be seen that actual ratio is round the upper and lower ripple of theoretical ratio
Dynamic, that the system of Fig. 2 to be realized is accurate time service output, it is necessary to F1, F2, F3 are modified, but defend at the actual Big Dipper
In star, we there is no tellings, and to be which satellite in the concrete a certain moment export as primary, the F1 of the most aforementioned acquisition,
It is more accurate which F2, F3 tri-be worth, and we are merely able to make this patent system meet traditional any reason as much as possible
Opinion, including aforementioned select F1, F2, F3 north half satellite sequentially we use standard from West to East, and use with
Under correction strategy:
The first strategy: actual ratio is more than theoretical ratio (0.47), then prediction actual ratio will diminish, i.e. the difference of (F2-F1)
Value change will be less than the difference change of (F3-F2), then take to increase F1, reduce F2, the correction strategy of increase F3, after correction be
F1=F1+DX、F2=F2-DX、F3=F3+DX；
The second strategy: actual ratio is less than theoretical ratio (0.47), then prediction actual ratio will become big, i.e. the difference of (F2-F1)
Value change will be greater than the difference change of (F3-F2), then take to reduce F1, increase F2, the correction strategy of reduction F3, after correction be
F1=F1-DX、F2=F2+DX、F3=F3-DX；
This correction DX is crossed conference and is caused time service precision to be deteriorated；The too small effect also not having correction, needs according to ground base
Standing depending on the application of reality, in analog simulation, we are to Cu1605 Systematic selection DX=30；To AL1605 Systematic selection DX=
15；Rb1609 Systematic selection DX=3 is modified test.Fig. 5 and Fig. 6 gives two kinds of plans of Rb1609 Systematic selection DX=3
Slightly descend accurate time transmission Q-value design sketch (Q-value size reflects the precision of system time service, is the bigger the better), and concrete Q-value is logical
Crossing in existing Service of Timing, analyser more steady than phase instrument or frequency is monitored the degree of stability obtained to ground base station time service frequency signal
Reflect.
In Fig. 5 and Fig. 6, three bigger curves that fluctuate are respectively three sampling time intervals revising signal F1, F2, F3
The data of t=1 second, and the curve of distribution is system accurate time transmission Q-value in ladder.
From two emulation testing figures it can be seen that either the first strategy or the second strategy, all can make the Q of system
Value has significantly increase.The chance revised due to two kinds of strategies will not occur simultaneously, and makeover process will not be carried out simultaneously, thus always
Q-value should be two kinds of tactful superpositions.But from two figures it can also be seen that a bit, i.e. at the initial stage of emulation testing, due to system
Not preheating, need the regular period (generally 1-2 days) during entering steadily test, perhaps the result of test deposits with actual effect
In bigger deviation, therefore application is opened after system strategy needs to wait until the 3rd day and is carried out.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Any amendment, equivalent and the improvement etc. made within god and principle, should be included within the scope of the present invention.
Claims (5)
1. local station, ground based on the many stars of Big Dipper time dissemination system, including local station, ground, it is characterised in that: described ground local
Stand and connected by wireless signal with the Big Dipper one, the Big Dipper two, the Big Dipper three respectively；The war of described ground local include receiver,
High steady atomic clock and time service correcting module composition；The steady atomic clock of described height and receiver wireless connections, described receiver and time service
Correcting module connects.
Local station, ground based on the many stars of the Big Dipper the most according to claim 1 time dissemination system, it is characterised in that: described height is steady
Local signal is synchronized local residual error data and passes to time service correcting module by atomic clock.
Local station, ground based on the many stars of the Big Dipper the most according to claim 1 time dissemination system, it is characterised in that: described reception
Machine accepts the Big Dipper system reference time and data are uploaded by time frequency ratio.
Local station, ground based on the many stars of the Big Dipper the most according to claim 1 time dissemination system, it is characterised in that: described height is steady
Atomic clock is receiver offer signal accurate lock in time.
Local station, ground based on the many stars of the Big Dipper the most according to claim 1 time dissemination system, it is characterised in that: described reception
Machine and the steady atomic clock of height are positioned at same geographical position.
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| CN201610229882.8A CN105911568A (en) | 2016-04-14 | 2016-04-14 | Ground local station timing system based on multiple Beidou satellites |
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| CN201610229882.8A CN105911568A (en) | 2016-04-14 | 2016-04-14 | Ground local station timing system based on multiple Beidou satellites |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110824897A (en) * | 2019-11-22 | 2020-02-21 | 中国地震局地质研究所 | Synchronous time service system among various collectors |
| CN112666580A (en) * | 2020-12-16 | 2021-04-16 | 江汉大学 | Synchronization system of new energy vehicle |
| CN112782726A (en) * | 2020-12-30 | 2021-05-11 | 江汉大学 | Beidou satellite-borne navigation system |
| CN112904705A (en) * | 2021-01-22 | 2021-06-04 | 重庆邮电大学 | Hierarchical clock synchronization method between low-orbit small satellites |
| CN115639743A (en) * | 2022-10-19 | 2023-01-24 | 中国科学院国家授时中心 | Space-based time reference establishing method and system based on whole network time comparison |
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| CN115639743A (en) * | 2022-10-19 | 2023-01-24 | 中国科学院国家授时中心 | Space-based time reference establishing method and system based on whole network time comparison |
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