CN108536003A - Accurate time transmission system and method and time service service system - Google Patents
Accurate time transmission system and method and time service service system Download PDFInfo
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- 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
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Abstract
The present invention discloses accurate time transmission system, method and time service service system.Accurate time transmission system includes satellite-based augmentation system, time service service system and user terminal.Satellite-based augmentation system sends wide area enhancement information to time service service system.Time service service system also receives the observations of the GNSS from satellite data, the wide area enhancement information and the fiducial time from time service service centre, handle the observation data and the wide area enhancement information obtain the system time of every satellite, and the system time based on every satellite and fiducial time and obtain real-time system time difference of the system time relative to fiducial time of every satellite.User terminal receives the real-time system time difference and fiducial time that data and the time service service system are observed at least from the GNSS of satellite, it handles GNSS observation data and obtains user's local zone time and the system time of navigation system, the difference for obtaining user's local zone time and fiducial time with the difference of navigation system time according to real-time system time difference and user's local zone time, fiducial time is adapted to according to the difference by user's local zone time.
Description
Technical field
The present invention relates to time dissemination systems, more particularly to enhance the accurate time transmission system and method for system based on GNSS, also relate to
And time service service system.
Background technology
Global Satellite Navigation System (Global Navigation Satellite System, GNSS) be a kind of satellite-based without
The positioning of line electricity, navigation and time dissemination system include mainly GPS, GLONASS, BDS and Galileo system etc..GNSS is defended by navigation
Star broadcast navigation signal, it can be achieved that position and time accurate transmission, be all widely used in numerous areas.Time service/when
Between synchronous applications field, GNSS receiver can utilize the radio signal that broadcast of navigation satellite to be modified Local clock,
So that the time of receiver and GNSS system time synchronization, reach the time synchronization mesh between time service or different terminals
's.However, the time service precision of common GNSS receiver is only 20ns~50ns at present, the requirement with people to time precision is got over
Come higher, there are clearly disadvantageous for the precision, it would be highly desirable to improve.
As can be seen that it will be at by the definition " use radio wave broadcast time reference signal, for multiple user's uses " of time service
3 conditions are must satisfy for a kind of time service method：(1) broadcast time reference signal；(2) number of users is unrestricted；(3) have
Real-time.
Time service equipment obtains the temporal information of standard from the signal of Beidou navigation satellite or GPS navigation satellite, by this
A little information are transferred to equipment (computer, main controller, sample devices, the RTU for needing temporal information by various types of interfaces
Deng), it can thus reach the time calibration of individual equipment or the time synchronization of multiple systems, this process is just called satellite
Time service.
Atomic clock (caesium clock either rubidium clock) is all equipped on GPS satellite or big-dipper satellite.There is accurate clock, adds
The time of the continuous correction at upper ground surface station, satellite system can be very accurately.Satellite can broadcast one in the text of oneself
Time, signal edge and this time value for broadcasting this time are strictly corresponding.It, can be in local by measuring this edge
An accurate variation edge is recovered, this edge is synchronous with emission time.Current time is provided in navigation message
" all numbers " at place, this week number are started counting up from the initial time of the Big Dipper or GPS system, are modulated additionally by calculating
The information of pseudo noise code on carrier wave is known that the second in current week, has these information that timing function can be realized.
The time synchronizing signal and interface mode of mainstream have 1PPS/1PPM, IRIG-B code, RS-232 serial ports and NTP at present
Time calibration in network etc..1PPS/1PPM pulses and IRIG-B code time service precisions can reach nanosecond order, RS-232 and NTP time services
Precision is up to millisecond magnitude under normal circumstances.1PPS/1PPM and IRIG-B codes and RS-232 are required for special purpose interface and cable, and
The mode of network then can be used in NTP modes.
A) 1PPS/1PPM time services mode：This format is that time signal exports a pulse signal in per second or every timesharing.It is aobvious
So, pulse output is free of specific temporal information.
B) IRIG shares several coding standards of A, B, D, E, G, H in B codes time service mode.Wherein make in time synchronization application
With it is most be the formats such as IRIG-B codings, DC codes (BC level deviations), AC codes (amplitude modulation of 1kHz sinusoidal carriers).IRIG-B signals
One frame of output per second is one second per frame length.One frame of IRIG-B signals shares 100 symbols, by the symbol of different pulse widths
Represent Binary Zero, 1 and tick lables position, there is the defects of time encoding frame excessive cycle for B code time service modes, receive one
The minimum time used in frame time information is about 1 minute.
C) RS-232 serial ports time service mode：Which time output be by EIA standard serial interfaces send a string with
The date and time message that ASCII character indicates.It is abundant to can be inserted into even-odd check, clock status, diagnostic result etc. in time message
Information.Such method can intuitively see current temporal information, and correction at any time using software on computers
It is computer time, very easy to use, but the time service precision of which is poor.
D) time calibration in network mode：Time calibration in network be using Network Time Protocol transmit on the internet unification, standard time.Tool
The implementation of body is that some time server is specified on network, provides time service service, and these Time Services to the user
It should be able to mutually be compared between device, improve accuracy.In LAN all PC, server and other equipment by network and when
Between server keep synchronize, Network Time Protocol automatic decision network delay, and the data to obtaining carry out time bias.To make office
The domain net equipment time keeps unified accurate, and which needs user to connect internet, can not be awarded using network in no network area
When.
In order to further increase time service precision, common atomic clock carries out high-precision time service at present.High-precision atomic clock time service
The principles such as the transition for the grade that uses atomic energy realize the regulation and control to crystal oscillator frequency, achieve the purpose that export high-precision frequency marking.Using normal
Rule GNSS receiver carries out taming mode to atomic clock and makes the time precision of atomic clock consistent with GNSS Conventional Time precision,
20ns~50ns can be reached, still, still cannot meet requirement of many fields to precision.Secondly, atomic clock often volume
It is larger with power consumption, and cost is higher, is not suitable for public application.
The mode of another precise synchronization is by two GNSS receivers while to observe identical satellite letter
Number, it is resolved using single differential mode formula and achievees the purpose that time synchronization.This mode be only capable of realizing rover station and base station it
Between time synchronization, and absolute time calibration cannot be carried out to terminal, thus only a kind of clock synchronization system rather than it is tight
Time dissemination system in lattice meaning.In addition, the relative time method of synchronization requires two receivers that must regard identical satellite altogether, so
It is limited by baseline length, is a kind of zonal clock synchronization system, is not suitable for the time service of wide area.
Invention content
Problems solved by the invention be relatively low atomic clock time service precision, volume and power consumption it is larger be not suitable for it is popular application with
And the problem of being limited to baseline length depending on time service altogether.
To solve the above problems, the present invention provides a kind of accurate time transmission method, this method comprises the following steps：It is come from
The wide area enhancement information of satellite-based augmentation system and GNSS from satellite observe data, according to the wide area enhancement information and described
Observation data calculation goes out the system time of every satellite；The system time of every satellite is compared with fiducial time, is obtained
Real-time system time difference of the system time of every satellite relative to fiducial time, the real-time system time difference is broadcasted outward；Extremely
Few GNSS observation data received from satellite, handle the GNSS observation data and acquisition user's local zone time and user are local
The difference of the system time of time and navigation system；According to the real-time system time difference and user's local zone time and navigation
The difference of the system time of system obtains the difference of user's local zone time and fiducial time, according to the difference by user's local zone time
It is adapted to fiducial time.
In a kind of scheme, it includes receiving the GNSS observations from satellite at least to receive the observations of the GNSS from satellite data
Data and wide area enhancement information from described satellite-based augmentation system handle the GNSS observation data and institute in such cases
It states wide area enhancement information and obtains the difference of user's local zone time and user's local zone time and the system time of navigation system.
In a kind of scheme, it further includes receiving time difference model data at least to receive the observations of the GNSS from satellite data, this
In the case of kind, the real-time system time difference specifically refer to based on the time difference model to real-time system time difference for receiving into
Row extrapolation is to obtain the difference that the user observes the fiducial time at moment and the system time of every satellite.
In a kind of scheme, by wide area enhancement information of the PPP algorithm process from satellite-based augmentation system and satellite is come from
GNSS observation data and obtain the system time.
In a kind of scheme, the fiducial time is the standard time of every country.
Invention additionally discloses a kind of time service service system, which includes GNSS receiver and clock synchronization system, wherein
The GNSS receiver receives the GNSS from satellite and observes data；The clock synchronization system receives fiducial time, comes from star
Base enhances the wide area enhancement information of system and the GNSS observes data, handles the GNSS observation data and wide area enhancing
Information obtains the system time of every satellite, and the system time based on every satellite and fiducial time and obtain every satellite
Real-time system time difference of the system time relative to fiducial time, the real-time system time difference is broadcast outward.
In a kind of scheme, the clock synchronization system includes receiving module and processing module and sending module, wherein institute
It states receiving module and receives fiducial time, wide area enhancement information and GNSS observation data, transmit the fiducial time, wide area enhancing
Information and the GNSS observe data to the processing module；The processing module handles the observation data and wide area enhancing
Information obtains the system time of every satellite, and the system time based on every satellite and fiducial time and obtain every satellite
Real-time system time difference of the system time relative to fiducial time；The sending module sends described real-time to the user terminal
System time is poor.
In a kind of scheme, the clock synchronization system by GNSS of the PPP algorithm process from satellite observe data and
Enhancement information from GEO telecommunication satellites and obtain the system time.
In a kind of scheme, the fiducial time is the standard time of every country.
The present invention discloses a kind of accurate time transmission system, including satellite-based augmentation system, time service service system and user terminal,
In, described satellite-based augmentation system sends wide area enhancement information to time service service system；The time service service system is claim 6
To the time service service system described in 9 any 1；The user terminal at least receives the observation data of the GNSS from satellite, place
It manages the GNSS and observes data to obtain the difference of user's local zone time and user's local zone time and the system time of navigation system,
According to from the time service service system the real-time system time difference and when the system of user's local zone time and navigation system
Between difference obtain user's local zone time and fiducial time difference, when user's local zone time being adapted to benchmark according to the difference
Between.
In a kind of scheme, the GNSS observation data at least received from satellite include receiving the GNSS from satellite
Data and the wide area enhancement information from described satellite-based augmentation system are observed, in such cases, handles the GNSS observations data
The difference of user's local zone time and user's local zone time and the system time of navigation system is obtained with the wide area enhancement information.
In a kind of scheme, it further includes receiving time difference model data at least to receive the observations of the GNSS from satellite data, this
In the case of kind, the real-time system time difference specifically refer to based on the time difference model to real-time system time difference for receiving into
Row extrapolation is to obtain the difference that the user observes the fiducial time at moment and the system time of every satellite.
Compared with prior art, the present invention has at least the following advantages：
1, since 1PPS/1PPM time services do not include specific temporal information, B code time service existence time frames excessive cycle, RS-
The shortcomings of 232 serial ports time service precisions are poor, time calibration in network is limited by network, for these disadvantages, accurate time transmission side of the invention
Method obtains the system time of every satellite by resolving wide area enhancement information and the GNSS observations data from satellite, then will
The system time is compared with fiducial time to obtain the real-time system time difference, in addition to this, is also handled GNSS and is observed data
The difference of user's local zone time and the system time of navigation system is obtained with the wide area enhancement information from GEO telecommunication satellites, most
Afterwards, user's local zone time is obtained according to real-time system time difference and the difference of user's local zone time and the system time of navigation system
With the difference of fiducial time, user's local zone time is adapted to by fiducial time according to the difference, so, system of the invention and side
Method contains specific temporal information, easily with fiducial time carry out time synchronization, time service speed is fast, can several seconds it
Time service inside can be completed.
2, in the above method, as long as user terminal can receive the GEO from GNSS observations data, satellite-based augmentation system and lead to
Wide area enhancement information and the real-time system time difference for believing satellite, without needing connection mutual as existing network connection type
Networking, so, such as sea desert remote districts can also carry out time service under the scene of no network, while enhance skill using wide area
Art reduces or weakens time synchronization error, and timing tracking accuracy is up to nanosecond order, and time service precision is higher, and is awarded without dedicated
When equip, it is possible to provide in the whole nation or even global range more extensively, the absolute time of rapider, higher precision low cost it is defeated
Go out.
Description of the drawings
Fig. 1 is to regard time service method schematic diagram altogether；
Fig. 2 is the composition schematic diagram of accurate time transmission system of the present invention.
Specific implementation mode
For technology contents, construction feature, institute's reached purpose and effect that the present invention will be described in detail, below in conjunction with embodiment
And attached drawing is coordinated to be described in detail.
Referring to Fig. 1, principle used by accurate time transmission method of the present invention is described below.Country's mark is chosen in Chinese range
Fiducial time (UTC or NTSC) is used as between punctual, certainly, it will be appreciated by those skilled in the art that in other countries or region,
Local the recognized standard time can be chosen as fiducial time.It is the national standard time of Chinese range with fiducial time as follows
For illustrate the present invention.
Assuming that there is m master station, each master station and standard time center (China national time service center keep time laboratory)
It is synchronous with standard time UTC (NTSC) holdings by two-way satellite time and frequency transfer.In the present invention, due to being towards complete
State, so, the standard time that the national time service of fiducial time selection herein center is broadcast, the master station after synchronizing monitors GNSS satellite
Time signal, and then obtain the system time and the time difference UTC of fiducial time (NTSC)-GNSST of every satellite broadcasting, wherein
GNSST is GNSS Time, Chinese entitled GNSS satellite navigation system time.User terminal by receive GNSS observe data and
The wide area enhancement information (can also include integrity information to further provide precision) of GEO communication satellite broadcastings obtains
The time difference UserT-GNSST of user's local zone time and the system time of navigation system, wherein UserT is user's local zone time
User Time.Then time difference UTC (the NTSC)-GNSST of the fiducial time and GNSST received and the time difference are utilized
User's local zone time is adapted to fiducial time by UserT-GNSST, realizes that user's local zone time is synchronous with fiducial time.
Referring to Fig. 2, accurate time transmission system of the present invention includes satellite-based augmentation system, time service service system 2 and user terminal
3.Satellite-based augmentation system includes reference station 11, data processing centre 12, ground connecting station 13 and GEO communications in the present embodiment
Satellite.Reference station 11 includes GNSS base stations.GNSS base stations are responsible for GNSS observation data and (ephemeris, pseudorange, carrier phase and are led
Avionics text) acquisition.GNSS observations data are transmitted to data processing centre 12 by transmission link (circuit 1 in Fig. 2).Number
The GNSS observations data from reference station 11 are received according to processing center 12, stores, handle, and are generated according to specific format
Wide area enhancement information (as shown in circuit 2) and time difference model data (as shown in circuit 2b), meanwhile, data processing centre 12 is also negative
The integrity monitoring for blaming whole system is monitored with system equipment, monitors the operation conditions of each subsystem, receives each subsystem hair
The software and hardware status information and warning information sent.The wide area enhancement information includes satellite ephemeris, difference in the present embodiment
Correction, ionosphere delay and integrity information, wherein differential corrections include orbit error correction and satellite clock correction correction
Number, certainly, those skilled in the art can also according to circumstances select above-mentioned parameter, as long as follow-up time service service can be used for
System resolves the real-time system time difference.The wide area enhancement information is carried by VSAT equipment utilization GEO telecommunication satellites
The wide area enhancement information is sent to ground connecting station 13 by Ku load, and circuit is directed toward generation as shown in 2 circuits in Fig. 2
The table flow direction of wide area enhancement information.Ground connecting station 13 receives the wide area enhancement information that GEO telecommunication satellites transmit, to the wide area
The controls such as enhancement information spread, modulated, up-conversion are sent to GEO telecommunication satellites by antenna and carry out L multi-band broadcasts (Fig. 2
In circuit 3, technical staff be appreciated that circuit 3 be spread spectrum, modulation, up-conversion enhancement information, it is, to 2 institute of circuit
The wide area enhancement information of representative spread, modulate and up-conversion obtains enhancement information representated by circuit 3).Time service service
System 2 receives the wide area enhancement information (such as circuit 5) that the GEO telecommunication satellites from described satellite-based augmentation system are sent, and also receives
Observation data (circuit 1) from satellite, resolve the wide area enhancement information and GNSS observations data obtain every satellite
System time.The time service service system 2 can also obtain fiducial time by network connection national standard time centre, will be every
The system time of satellite is compared with fiducial time, and it is real-time relative to fiducial time to obtain the system time of every satellite
System time is poor, and outside (user terminal) broadcasts the real-time system time difference.In a specific embodiment, the time service clothes
Business system includes GNSS receiver and clock synchronization system.The GNSS receiver receives the GNSS from satellite and observes data.
The clock synchronization system receives fiducial time, the wide area enhancement information from satellite-based augmentation system and the GNSS and observes number
According to handling GNSS observation data and the wide area enhancement information obtain the system time of every satellite, and defended based on every
System time and the fiducial time of star and real-time system time difference of the system time relative to fiducial time for obtaining every satellite,
The real-time system time difference is broadcast outward.In more specifically embodiment, the clock synchronization system includes receiving module
With processing module and sending module.The receiving module receives fiducial time, wide area enhancement information and the GNSS and observes data,
It transmits the fiducial time, wide area enhancement information and the GNSS and observes data to the processing module.The processing module processing
The observation data and the wide area enhancement information obtain the system time of every satellite, and the system time based on every satellite and
Fiducial time and real-time system time difference of the system time relative to fiducial time for obtaining every satellite, for example, being calculated by PPP
When GNSS of the method processing from satellite observes data and obtains the system from the wide area enhancement information of GEO telecommunication satellites
Between.The sending module sends the real-time system time difference to the user terminal.The user terminal 3 is at least received and is come from
The GNSS of satellite observes data, handles the GNSS observation data to obtain user's local zone time and user's local zone time and to lead
The difference of the system time of boat system, when according to the real-time system time difference for carrying out time service service system and the user local
Between the difference of user's local zone time and fiducial time is obtained with the difference of the system time of navigation system, according to the difference by user
Local zone time is adapted to fiducial time.In order to provide time service precision, the GNSS observation data packets at least received from satellite
It includes and receives the GNSS observation data from satellite and the wide area enhancement information from described satellite-based augmentation system, in such cases,
It handles the GNSS observation data and the wide area enhancement information and obtains user's local zone time and user's local zone time and navigation
The difference of the system time of system.Further, it further includes differential mode when receiving at least to receive the observations of the GNSS from satellite data
Type data, in such cases, the real-time system time difference are specifically referred to based on the time difference model to the real-time system that receives
The system time difference extrapolates to obtain the difference that the user observes the fiducial time at moment and the system time of every satellite..
Please continue to refer to Fig. 2, illustrate that the workflow of accurate time transmission method of the present invention is as follows：
A) be distributed in various regions reference station 11 acquired respectively using dual-frequency receiver satellite GNSS observation data (ephemeris,
Pseudorange, carrier phase and navigation message).These data informations are transferred in real time by transmission link (circuit 1 in Fig. 2)
Data processing centre 12, as shown in circuit 1.
B) data processing centre 12 receives the real-time observed data from reference station 11 and carries out Precise Orbit, clock correction
It resolves and integrity information is handled, obtain wide area enhancement information (circuit 2) and time difference model data (circuit 2b).Wide area enhancing letter
Breath includes satellite ephemeris, differential corrections, ionosphere delay and integrity information.Wide area enhancement information is compiled according to specific format
By communication link (circuit 2 in transmission direction such as Fig. 2) to GEO communication satellite broadcastings after row, by the time difference model data
It is transferred to user terminal 3 by circuit 2b.The prior art may be used in the time difference model data, for example utilizes multinomial model
The time difference model data of foundation.
C expand after) ground connecting station 13 is errorless to the wide area enhancement information verification from GEO telecommunication satellites received
Frequently, the processing such as modulation, up-conversion are injected into GEO telecommunication satellites.GEO telecommunication satellite C/L transponders receive ground uplink injection system
It unites after the C-band signal sent, carries out frequency-conversion processing (circuit 3 in Fig. 2) to L1 to user terminal 3 and time service service system 2
It broadcasts (circuit 5 in Fig. 2)；
D) GNSS receiver of time service service system 2 receives GNSS observation data (circuit 1 in Fig. 2), and it is logical to receive GEO
Believe the wide area enhancement information (circuit 5 in Fig. 2) of the L multi-band broadcasts of satellite, real-time resolving goes out the system time of every satellite
GNSST.Time service service system 2 also obtains fiducial time, for example, by internet connects national time service service centre
Fiducial time is obtained, and then obtains the real-time system time difference UTC of the system time and fiducial time of every satellite broadcasting
(NTSC) the real-time system time difference is broadcast to user terminal 3 by-GNSST.
E) user terminal 3 receive GNSS observation data (circuit 1), GEO communication satellite broadcastings wide area enhancement information (circuit
5), real-time system time difference (circuit 4) and time difference model data (circuit 2b) handle the observation data and are communicated from GEO
The wide area enhancement information of satellite obtains the difference UserT-GNSST of user's local zone time and the system time of navigation system, goes back root
When carrying out the benchmark at extrapolation acquisition user's observation moment to the real-time system time difference according to the corresponding model of the time difference model data
Between difference with the system time of every satellite, using this difference as the real-time system time difference, then, according to difference
User's local zone time is adapted to fiducial time by the fiducial time and system time difference that UserT-GNSST and extrapolation obtain, and is realized
User's local zone time is synchronous with fiducial time.In this step, it will be understood by those skilled in the art that in no GNSS satellite
Signal but in the case of having GEO satellite signal, may be used following technical solution：The circuit 4 include wide area enhancement information and
The real-time system time difference, the circuit 2 includes time difference model data and GNSS observations data can also resolve in such cases
To the time difference and the real-time system time difference of user's local zone time and the system time of navigation system.Including circuit 1, circuit
2, the parameter that circuit 4 and circuit 5 represent is only so that precision highest.
The present invention at least has the following advantages that：
1, since 1PPS/1PPM time services do not include specific temporal information, B code time service existence time frames excessive cycle, RS-
The shortcomings of 232 serial ports time service precisions are poor, time calibration in network is limited by network, for these disadvantages, accurate time transmission side of the invention
Method obtains the system time of every satellite by resolving wide area enhancement information and the GNSS observations data from satellite, then will
The system time is compared with fiducial time (national standard time UTC) to obtain the real-time system time difference, in addition to this, also
What processing GNSS observation data and wide area enhancement information from GEO telecommunication satellites obtained user's local zone time and navigation system is
The difference of system time is finally used according to real-time system time difference and user's local zone time and the difference of navigation system time
User's local zone time is adapted to fiducial time by the difference of family local zone time and fiducial time according to the difference, so, the present invention
System and method contain specific temporal information, easily with fiducial time (national standard time) carry out the time it is same
Step, time service speed is fast, time service can be completed within several seconds；
2, in the above method, as long as user terminal can receive the GEO from GNSS observations data, satellite-based augmentation system and lead to
Wide area enhancement information and the real-time system time difference for believing satellite, without connecting interconnection as existing network connection type
Net, so, such as sea desert remote districts can also carry out time service under the scene of no network, while enhance technology using wide area
Reducing or weakens time synchronization error, timing tracking accuracy is up to nanosecond order, and time service precision is higher while time service precision is higher,
And equipped without dedicated time service, it is possible to provide more extensive, rapider, higher precision the low cost in the whole nation or even global range
Absolute time output.
Claims (12)
1. a kind of accurate time transmission method, characterized in that include the following steps：
It obtains the wide area enhancement information from satellite-based augmentation system and the GNSS from satellite observes data, increased according to the wide area
Strong information and the observation data calculation go out the system time of every satellite；
The system time of every satellite is compared with fiducial time, when obtaining the system time of every satellite relative to benchmark
Between the real-time system time difference, broadcast the real-time system time difference outward；
The GNSS observation data from satellite are at least received, the GNSS observation data are handled and obtain user's local zone time and use
The difference of family local zone time and the system time of navigation system；
It is used according to the real-time system time difference and the difference of user's local zone time and the system time of navigation system
User's local zone time is adapted to fiducial time by the difference of family local zone time and fiducial time according to the difference.
2. accurate time transmission method according to claim 1, characterized in that at least receive the GNSS observation data from satellite
Data are observed including receiving the GNSS from satellite and from the wide area enhancement information of described satellite-based augmentation system, such situation
Under, it handles the GNSS observation data and the wide area enhancement information and obtains user's local zone time and user's local zone time and lead
The difference of the system time of boat system.
3. accurate time transmission method according to claim 2, characterized in that at least receive the GNSS observation data from satellite
Further include receiving time difference model data, in such cases, the real-time system time difference specifically refers to be based on the time difference model
It extrapolates to the real-time system time difference received and observes fiducial time at moment and every satellite to obtain the user
The difference of system time.
4. according to the accurate time transmission method described in claims 1 to 3 any 1, characterized in that by PPP algorithm process come
It observes data with the GNSS from satellite from the wide area enhancement information of satellite-based augmentation system and obtains the system time.
5. according to the accurate time transmission method described in claims 1 to 3 any 1, characterized in that the fiducial time is each
The standard time of country.
6. a kind of time service service system, characterized in that the system includes GNSS receiver and clock synchronization system, wherein
The GNSS receiver receives the GNSS from satellite and observes data；
The clock synchronization system receives fiducial time, the wide area enhancement information from satellite-based augmentation system and GNSS observations
Data, handle the GNSS observation data and the wide area enhancement information obtains the system time of every satellite, and are based on every
System time and the fiducial time of satellite and real-time system time of the system time relative to fiducial time for obtaining every satellite
Difference broadcasts the real-time system time difference outward.
7. time service service system according to claim 6, characterized in that the clock synchronization system include receiving module and
Processing module and sending module, wherein
The receiving module receives fiducial time, wide area enhancement information and the GNSS and observes data, transmits fiducial time, wide
Domain enhancement information and the GNSS observe data to the processing module；
The processing module handles the observation data and the wide area enhancement information obtains the system time of every satellite, and is based on
System time and the fiducial time of every satellite and to obtain the system time of every satellite real-time relative to the national standard time
System time is poor；
The sending module sends the real-time system time difference to the user terminal.
8. time service service system according to claim 6, characterized in that the clock synchronization system by PPP algorithms at
It manages the observation data of the GNSS from satellite and enhancement information from GEO telecommunication satellites and obtains the system time.
9. time service service system according to claim 6, characterized in that when the fiducial time is the standard of every country
Between.
10. a kind of accurate time transmission system, characterized in that including satellite-based augmentation system, time service service system and user terminal,
In,
Described satellite-based augmentation system sends wide area enhancement information to time service service system；
The time service service system is the time service service system described in any 1 in claim 6 to 9；
The user terminal at least receives the observation data of the GNSS from satellite, handles the GNSS and observes data to obtain user
The difference of local zone time and user's local zone time and the system time of navigation system, according to the reality from the time service service system
When system time difference and the difference of user's local zone time and the system time of navigation system obtain user's local zone time and base
Difference between punctual, fiducial time is adapted to according to the difference by user's local zone time.
11. accurate time transmission service system according to claim 10, characterized in that described at least to receive from satellite
GNSS observations data include receiving the GNSS observation data from satellite and the wide area enhancing letter from described satellite-based augmentation system
Breath handles the GNSS observation data and the wide area enhancement information and obtains user's local zone time and user in such cases
The difference of local zone time and the system time of navigation system.
12. accurate time transmission method according to claim 11, characterized in that at least receive the GNSS observation numbers from satellite
According to further including receiving time difference model data, in such cases, differential mode when the real-time system time difference specifically refers to be based on described
Type extrapolate to the real-time system time difference received with obtain the user observe the moment fiducial time and every satellite
System time difference.
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