GNSS CP technology-based uninterrupted time transfer method

Abstract

The invention provides a GNSS CP technology-based uninterrupted time transfer method. Interpolation processing is performed on a satellite orbit and clock error product through a sliding window, and aphenomenon that a hop and an abnormal value of a time transfer amount of a one-day solution frequently occur at a of is eliminated; processing a carrier phase observed value based on a CP model in the time transfer field, a receiver clock error is regarded as a white noise parameter to be estimated, so that a clock error parameter better reflects an actual characteristic of a local clock, anti-error estimation is performed on a GPS CP observed quantity, and influence of a gross error and abnormal value on time transfer is effectively proposed; and finally, continuous estimation and continuous inheritance strategies are adopted for carrier phase ambiguity of a satellite separately, thereby providing a new technical means for continuous monitoring and scientific research of time and frequency signals. The GNSS CP technology-based uninterrupted time transfer method provided by the invention is advanced in algorithm, good in continuous operation stability, and easy to operate.

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...

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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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