Real-time precise time transfer method based on double-difference mode

A precision time and double-difference ambiguity technology, which is applied in satellite radio beacon positioning systems, measuring devices, instruments, etc., can solve the problem that the carrier phase ambiguity does not have integer characteristics, the influence of parameter estimation convergence and accuracy, and non-integrability Fixed issues such as the ambiguity of the week to achieve the effect of facilitating real-time applications, improving the accuracy of time transfer, and speeding up the convergence speed

Pending Publication Date: 2020-09-11
NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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Problems solved by technology

However, the current carrier phase time transfer method has three limitations. One is that the non-difference or single difference mode is used, and many errors in the observations are difficult to deal with efficiently, which affects the accuracy of time transfer. The second is that the carrier phase in the current time transfer solution The phase ambiguity does not have the characteristics of the whole cycle, and the fixed ambiguity of the whole cycle cannot be fixed, which will affect the convergence and accuracy of parameter estimation; third, the current carrier phase time transfer method is a post-processing mode, which requires the support of precise ephemeris. Not convenient for real-time application

Method used

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  • Real-time precise time transfer method based on double-difference mode

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Embodiment 1

[0030] The invention composes the observations of the time master station and the user station into a double-difference mathematical model, performs parameter estimation to obtain the initial value of the double-difference ambiguity and the corresponding variance-covariance matrix, and realizes the fixation of the double-difference ambiguity; at the same time, the reference satellite is selected And given the inter-station single-difference ambiguity reference value of the reference satellite, back-calculate the inter-station single-difference ambiguity of all public satellites; establish a mathematical model for the inter-station single-difference observation, substitute the back-calculated inter-station single-difference ambiguity, and solve The time difference parameter realizes real-time precision time transmission.

[0031] Technical scheme of the present invention mainly comprises three core technologies:

[0032] 1. Double-difference mathematical model establishment and...

Embodiment 2

[0047] Embodiment 2 is established based on the three core technologies in Embodiment 1. The specific embodiments are as follows:

[0048] Such as figure 1 As shown, the embodiment of the present invention includes data acquisition, data preprocessing, error model correction, establishment of double difference mathematical model, double difference solution and double difference ambiguity fixation, determination of reference star and single difference ambiguity benchmark, single difference between stations Inverse calculation of difference ambiguity, establishment of single-difference mathematical model between stations, and solution of time difference parameters are nine parts.

[0049]The first step is data acquisition. Obtain the dual-frequency pseudo-range and phase observation data of satellites on the time master station and user station, as well as auxiliary data required for data processing, including broadcast ephemeris, antenna phase center, earth rotation parameters...

experiment example

[0059] figure 2 For the comparison of the time transfer results between the broadcast ephemeris and the precision ephemeris (conventional PPP method) used in this patent method, it can be seen from the figure that the present invention converges faster under the premise that the real-time accuracy is equivalent to the post-event accuracy.

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Abstract

The invention relates to the technical field of time transfer, and relates to a real-time precise time transfer method based on a double-difference mode. The real-time precision time transfer method comprises the following steps: firstly, based on satellite observation data of a time master station and a user station, establishing a double-difference mathematical model and constraining coordinatesof an observation station to carry out calculation to obtain a floating point solution of double-difference ambiguity and a corresponding variance matrix, and carrying out double-difference ambiguityfixing; secondly, selecting a reference satellite, giving a reference value of the inter-satellite single-difference ambiguity of the satellite, and inversely calculating the inter-satellite single-difference ambiguity of all satellites based on the fixed double-difference integer ambiguity; and then, establishing an inter-station single-difference mathematical model, substituting the inversely calculated single-difference ambiguity into an inter-station single-difference observation equation, and solving a time difference parameter between the two stations to realize real-time time transfer.

Description

technical field [0001] The invention relates to the technical field of time transfer, in particular to a real-time precision time transfer method based on a double difference mode. Background technique [0002] The time transfer method based on the satellite navigation system has the characteristics of low cost, good continuity, all-weather, all-time and so on, and is widely used. Satellite time transfer methods based on pseudo-range observations include common view method (CV) and all-view method (AV); satellite time transfer methods based on carrier phase observations include non-difference precise point positioning (PPP) and inter-station single difference law (SD). The accuracy of carrier phase observation is 100 times that of pseudorange observation, so the time transfer technology based on carrier phase observation has become the current mainstream technology. However, the current carrier phase time transfer method has three limitations. One is that the non-differenc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/25G01S19/29G01S19/37G01S19/42
CPCG01S19/256G01S19/29G01S19/37G01S19/42
Inventor 涂锐卢晓春张鹏飞张睿韩军强范丽红鲁洋为
Owner NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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