A method of uninterrupted time transfer based on gnss CP technology

Abstract

The present invention provides an uninterrupted time transfer method based on GNSS CP technology, which interpolates the satellite orbit and clock error products through the sliding window method, and eliminates the time transfer amount of the single-day solution that often occurs at the connection between the sky and the sky Jumping and outlier phenomena; based on the CP model in the field of time transfer, the carrier phase observations are processed, and the receiver clock error is estimated as a white noise parameter, so that the clock error parameter can better reflect the actual characteristics of the local clock. And the GPS CP observations are robustly estimated, and the influence of gross errors and abnormal values ​​on time transfer is effectively proposed; finally, the continuous estimation and continuous inheritance strategies are adopted for the carrier phase ambiguity of the satellite, which is the continuous monitoring of time and frequency signals. And scientific research provides a new technical means. The invention has advanced algorithms, good continuous running stability and easy operation.

Description

technical field [0001] The invention relates to a GNSS-based remote precision time transfer method. Background technique [0002] The global satellite navigation and positioning system (GNSS) is based on high-precision time measurement, and on the other hand, it also provides a new way of precise time transfer service. Due to the continuity, high precision, and global nature of GNSS observations, it has become a new and important technical means for time transfer between international time-frequency agencies. GNSS-based remote time transfer is mainly divided into two categories of methods. One is satellite common view (CV) time transfer using GNSS pseudo-range observations. Since this method needs to observe the same satellite at the sites participating in time transfer at the same time, this method is vulnerable to the distance between sites and The precision limit of the pseudo-range observation value; the other is to use the All View method (All View, AV) for long-dista...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the deficiencies of the prior art, the present invention provides an uninterrupted time transfer method based on GNSS CP technology, and designs a precision orbit and clock error interpolation method based on a sliding window, which effectively overcomes the general polynomial at the end of the data arc. At the same time, white noise is used to simulate the random characteristics of the receiver clock error, which effectively reflects the physical characteristics of the atomic clock, and the robustness estimation is used for quality control; finally, the continuous ambiguity estimation algorithm is used to solve the problem based on the traditional In the time transfer of GNSS CP technology, the phenomenon that the clock difference of the receiver is easily generated between the sky is effectively overcome; in addition, the method of uninterrupted time transfer is used to improve the international The long-term stability in TAI calculation and time scale comparison, especially the effect of more than one day is more obvious

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