阅读说明：本技术 基于rtk改进技术的标准时间亚纳秒级授时方法 (Standard time subnanosecond grade time service method based on RTK improved technology ) 是由 武美芳 孙保琪 于 2019-08-23 设计创作，主要内容包括：本发明提供了一种基于RTK改进技术的标准时间亚纳秒级授时方法,服务端基于iGMAS和IGS跟踪网络产生的GNSS观测数据,生成GNSS实时轨道产品,并将其通过通信网络,播发给用户端；所述的用户端包括基准站和流动站,基准站配置GNSS多模接收机,并测定坐标,基准站外接标准时间UTC(K)；流动站配置GNSS多模接收机；基准站与流通站之间建立网络链路,基准站实时将采集到的观测数据通过网络链路发送给流动站；流动站将接收到的基准站观测数据与本站观测数据差分,结合接收到的服务端的GNSS实时轨道产品,求解本站站钟与基准站站钟,即标准时间的差。本发明可得到亚纳秒级到纳秒级的实时授时精度。(The present invention provides a kind of standard time subnanosecond grade time service method based on RTK improved technology, server-side observe data based on the GNSS that iGMAS and IGS tracking network generates, and generate GNSS real-time track product, and it is broadcast by communication network to user terminal；The user terminal includes base station and rover station, and base station configures GNSS multimode rake receiver, and measures coordinate, the external standard time UTC (K) of base station；Rover station configures GNSS multimode rake receiver；Network link is established between base station and circulation station, collected observation data are sent to rover station by network link in real time by base station；The base station received observation data and our station are observed data difference by rover station, in conjunction with the GNSS real-time track product of the server-side received, solve our station station clock and base station station clock, the i.e. difference of standard time.Subnanosecond grade can be obtained to the real-time time service precision of nanosecond in the present invention.)

1. a kind of standard time subnanosecond grade time service method based on RTK improved technology, it is characterised in that the following steps are included:

Server-side observes data based on the GNSS that iGMAS and IGS tracking network generates, and generates GNSS real-time track product, and will It is broadcast by communication network to user terminal；The user terminal includes base station and rover station, and base station configures GNSS multimode Receiver, and coordinate is measured, the external standard time UTC (K) of base station；Rover station configures GNSS multimode rake receiver；Base station with Circulation establishes network link between station, and collected observation data are sent to rover station by network link in real time by base station； The base station received observation data and our station are observed data difference by rover station, and the GNSS in conjunction with the server-side received is real-time Track product solves our station station clock and base station station clock, the i.e. difference of standard time.

2. the standard time subnanosecond grade time service method according to claim 1 based on RTK improved technology, feature exist In: the GNSS refers to one of navigation system GPS, GLONASS, Galileo, BDS, QZSS, IRNSS, SBAS or appoints Meaning combination.

3. the standard time subnanosecond grade time service method according to claim 1 based on RTK improved technology, feature exist In: the communication network includes satellite network, internet and GPRS.

4. the standard time subnanosecond grade time service method according to claim 1 based on RTK improved technology, feature exist In: the distance between each base station is set as 10~30km.

5. the standard time subnanosecond grade time service method according to claim 1 based on RTK improved technology, feature exist In: the network link between the base station and circulation station includes GPRS, CDMA, internet and cable network.

Technical field

The present invention relates to a kind of high precision time service method, in particular to a kind of subnanosecond grade time service method.

Background technique

It determines, keep certain time scale, the temporal information for representing this scale is sent out by certain way, supply Application person uses, this whole set of work is known as time service in China, is known as Time Service in other countries.Time service service mentions for user For three kinds of essential informations: first is that at the time of in date and one day, it tell people's something betide when；Second is that between chronometer time Every, it tell people's event occur experience " how long " time；Third is that standard frequency, it marks the rate that certain events occur. With the development of human society and the progress of science and technology, Service of Timing achieves major progress.Nowadays, time service service has claimed For public good engineering indispensable in national economy, it even concerns national security.

Currently, according to the difference of time service means, can be divided into shortwave time service, long-wave time service, TV time service, internet time service, Telephone time service and satellite time transfer etc..Wherein, satellite time transfer, also referred to as GNSS time service.GNSS time service refers to that user is by solving position The deviation of coordinate and user clock with respect to the GNSS system time is set, and then corrects user clock, is realized and the GNSS system time Synchronous process, GNSS time service are the time service methods for the full accuracy being widely adopted at present.

In recent years, relevant scholar and research institution around GNSS time service carried out deeper into research, PPP is (accurate One-Point Location) technology be applied to GNSS time service.GNSS time service precision is in nanosecond to the magnitude of tens nanoseconds at present.With scientific skill The fast development of art, GNSS gradually expose some shortcomings.Firstly, as deep space exploration, Internet of Things, scientific experiment etc. are led Domain proposes the demand of higher precision to the time, and the time service precision of nanosecond to tens nanosecond orders is difficult to meet.Secondly, PPP skill The realization of art be unable to do without the products such as precise clock correction and track.When PPP is applied to time service, satellite clock correction and track must when high-precision real It is indispensable.Since satellite clock model is difficult to accurate determination, satellite clock correction is always one during GNSS is applied in real time when high-precision real A difficult point.Therefore, the high-precision time service based on PPP technology is difficult to accurately realize.Finally, current GNSS time service is based on each navigation The system time that system is kept, such as GPST, compared with the standard time, stability is lower.For example, by state, the Chinese Academy of Sciences The UTC (NTSC) that family time service center generates, keeps and issue, is the standard time in China, stability is up to 10 within 100 days^-16, Better than using GPST as the system time of each navigation system of representative.If being based on standard time time service, can largely change The stability of kind time service.

Therefore, it is very urgent for seeking a kind of higher precision, more high stability and the time service method being easily achieved.

Summary of the invention

For overcome the deficiencies in the prior art, the present invention provides a kind of standard time subnanosecond based on RTK improved technology Grade time service method, the case where containing base station suitable for user terminal, such as ground strengthening system, CORS system etc., can be obtained Asia Real-time time service precision of the nanosecond to nanosecond.

The technical solution adopted by the present invention to solve the technical problems is the following steps are included: server-side is based on iGMAS and IGS The GNSS that tracking network generates observes data, generates GNSS real-time track product, and it is broadcast by communication network to user End；The user terminal includes base station and rover station, and base station configures GNSS multimode rake receiver, and measures coordinate, base station External standard time UTC (K)；Rover station configures GNSS multimode rake receiver；Network link, base are established between base station and circulation station Collected observation data are sent to rover station by network link in real time by quasi- station；Rover station observes the base station received Data and our station observe data difference, in conjunction with the GNSS real-time track product of the server-side received, solve our station station Zhong Yuji Quasi- station station clock, the i.e. difference of standard time.

The GNSS refers to one of navigation system GPS, GLONASS, Galileo, BDS, QZSS, IRNSS, SBAS Or any combination.

The communication network includes satellite network, internet and GPRS.

The distance between each base station is set as 10~30km.

Network link between the base station and circulation station includes GPRS, CDMA, internet and cable network.

The beneficial effects of the present invention are:

1, the time service method can realize fast convergence, and time service precision is improved up to subnanosecond grade than GNSS time service in real time 1-2 magnitude.

RTK improved technology, by means of RTK position in differential principle, connect by amendment reference receiver with rover station Clock deviation of the receipts machine when receiving same satellite signal achievees the purpose that timing.The time service method based on RTK improved technology realize, By real time differential model, difference observation is formed in system and is handled in real time, last short, can reach the mesh of fast convergence 's.And traditional Service of Timing based on Static Precise Point Positioning (PPP), it usually needs the convergence of long period, thus certain The efficiency of real-time time service is influenced in degree.

The time service method is realized based on RTK improved technology, and RTK improved technology is the mode by difference, in base station Single poor observation model is acquired between rover station, is eliminated the influence of the satellite clock error shared between two survey stations, is weakened and defend The influence of star ephemeris error, in the case where short baseline, since the influence to process and ionospheric refraction has very strong correlation, Therefore Atmospheric Refraction Error can be eliminated.Based on this method time service, 1-2 magnitude is can be improved in time service precision, solves current time service essence The problem of degree is unable to satisfy certain high-precision applications demands.

2, the time service method does not need the participation of satellite clock, simplifies time service process, easy to promote and utilize.

Since satellite clock model is difficult to accurate determination, real-time satellite clock deviation is always a difficult point in application in real time.It should Method is realized based on RTK improved technology, is carried out first difference by the observation data to base station and rover station, is eliminated two The influence of the satellite clock error shared between survey station, i.e., entire time service process do not need the participation of real-time satellite clock deviation, on the one hand mention High time service precision, on the other hand significantly simplifies time service process, convenient for the popularization and application of the technology.

3, the time service method time service content is UTC (K), stability with higher.

By the external UTC of base station (K), make the time service content standard time.UTC (K) be various countries time laboratory generate, It keeps, there is very high stability.Based on standard time time service, the stability of time service can be significantly improved.Specific to China, UTC (NTSC) is the national standard time that China is autonomously generated, keeps and issues, and time service is related to national economy even country's peace Entirely, this method is utilized, the dependence to the GNSS system time can be weakened, increases time service safety.

Detailed description of the invention

Fig. 1 is time service schematic diagram of the invention.

Specific embodiment

Present invention will be further explained below with reference to the attached drawings and examples, and the present invention includes but are not limited to following implementations Example.

The present invention adopts the following technical scheme: the standard time subnanosecond grade time service method based on RTK improved technology, uses RTK improved technology includes mainly server-side, communication network and user terminal, and user terminal includes base station and rover station two parts.

RTK improved technology refers to, RTK location technology is applied in time service, by the differential principle in RTK, user terminal Rover station receive base station send observation data, and with our station observation data do first difference, in conjunction with server-side send Precise Orbit product, the clock deviation of Real-time solution rover station station clock and the external UTC of base station (K), to achieve the purpose that timing one Kind technology.

Server-side observes data based on the GNSS that iGMAS and IGS tracking network generates, and generates GNSS real-time track product, And it is broadcast by communication network to user terminal.Described GNSS refer to GPS, GLONASS, Galileo, BDS, QZSS, One or more combinations of major navigation system such as IRNSS, SBAS.

Communication network can be realized by multiple means such as satellite, internet, GPRS.

User terminal is divided into base station and rover station.Base station configures GNSS multimode rake receiver, and accurately measures its station coordinates, Distance may be configured as 10~30km between each base station.The external standard time UTC (K) of base station.The described standard time refers to The time for being generated by each time laboratory in the whole world, being kept and being issued, it is denoted as UTC (K).Rover station configures GNSS multimode and receives Machine.Network link is established between base station and circulation station, it can wirelessly or non-wirelessly mode be realized by GPRS, CDMA, internet etc.. Collected observation data are sent to rover station by network in real time by base station.Rover station includes time service module, and function is The base station received observation data and our station are observed into data difference, in conjunction with the real-time accurate track of the server-side received, Solve our station station clock and base station station clock, the i.e. difference of standard time.

Compared with existing Service of Timing, time service precision of the invention improves 1-2 magnitude.Also, the time service method is not necessarily to Real-time clock deviation product, it is easier to realize and promote.At the same time, it is based on standard time time service, is remarkably improved time service stability.

The present embodiment mainly includes server-side, communication network and user terminal.Server-side is based on iGMAS and IGS tracking network The GNSS of generation observes data, generates GNSS real-time track product, and it is broadcast by communication network to user terminal.

Communication network can be realized by satellite or internet.

User terminal is divided into base station and rover station.Each base station and rover station configure GNSS multimode rake receiver, each benchmark Distance may be configured as 10~30km between standing.Accurate measurement base station station coordinates, and external standard time UTC (K).One benchmark Periphery of standing can have one or more rover stations.Base station and rover station can receive GNSS observation signal.Base station and circulation are stood Between establish wireless network connection.Collected observation data are sent to rover station by network by base station.Rover station will connect The base station observation data and our station received observe data difference, in conjunction with the real-time accurate track of the server-side received, solve Our station station clock.

The working principle of the present embodiment, is described below:

The GNSS that server-side is generated based on iGMAS and IGS tracking network observes data, according to non-difference or the mode of double difference, GNSS real-time track product is generated, and it is broadcast by communication network to user terminal.

Communication network can be met the requirements using conventional network means, such as internet, GPRS, telecommunication satellite etc..

User terminal is divided into base station and rover station two parts.The external standard time UTC (K) of base station, and micrometric measurement station Coordinate.Shown in base station and rover station observational equation such as formula (1), (2):

Wherein:

S is satellite number；

R is receiver number, and r takes 1 or 2,1 to represent base station herein, and 2 represent rover station；

For Pseudo-range Observations；

For carrier phase observable；

For geometric distance, i.e. geometric distance of the satellite mass centre to receiver antenna reference point；

dt_rFor receiver clock-offsets；

dt^sFor satellite clock correction；

For the equivalent distances of ionosphere refraction delay；

For the equivalent distances of troposphere refraction delay；

For integer ambiguity；

WithFor the random error not modeled.

The pseudorange received and carrier phase observable are sent to rover station by Radio Link by base station, and rover station is awarded When module by the base station received observation data and our station observe data make the difference, obtain formula (3), (4):

Since base station and rover station distance are less than 30km, so the ionosphere and tropospheric refraction of base station and rover station Influence have very strong correlation, therefore be believed thatIt can eliminate as a result, big Gas refraction error.The external UTC of base station (K), i.e. dt₁(t)=UTC (K), and benchmark station coordinates accurately measures.Formula at this time (3), the unknown number in (4) only has difference UTC (the K)-dt for flowing station coordinates, rover station and base station clock deviation₂(t), fuzziness it Difference.4 and the above satellite are tracked by base station and rover station, flowing station coordinates, rover station station clock and UTC (K) can be found out Poor UTC (K)-dt₂(t).If (accurate measurement) known to rover station station coordinates, only needs to track 1 satellite, can be obtained The difference of rover station station clock and UTC (K).So far, rover station completes the entire mistake of the standard time time service based on RTK improved technology Journey.It should be noted that, this technique eliminates satellite clock, Atmospheric Refraction Error, therefore, time service are smart compared with GNSS time service Degree improves 1-2 magnitude compared with GNSS time service.