Beidou three-frequency non-differential non-combined observation value time transmission system and method

Abstract

The invention discloses a Beidou three-frequency non-differential non-combined observation value time transmission system and method. The method includes the steps that phase observation value, pseudo-range observation value, satellite ephemeris, earth rotation, antenna phase center and other parameters of China Beidou satellite navigation systems at two time transmission stations are obtained; data check, gross error reject and cycle slip detection are carried out, error models of ephemeris, tide, relativity, the earth rotation, atmosphere and antenna phase deviation are corrected; an ionospheric virtual observation model with additional ionospheric prior information constraints, spatial domain constraints and time domain constraints is constructed; and a three-frequency non-differentialnon-combinatorial precise single-point positioning model is constructed, a single-point positioning timing solution is carried out on corrected data, and comprehensive clock corrections of receivers of the two transmission time stations are obtained and compared to obtain a time transmission difference; and compared with standard time of one of the two transmission time stations, precise time of the other one of the two transmission time stations is obtained. According to the Beidou three-frequency non-differential non-combined observation value time transmission system and method, the observation noise can be reduced, and the accuracy and reliability of time transmission are improved.

Description

technical field [0001] The invention relates to the technical field of Beidou satellite transfer time, in particular to a time transfer system and method for Beidou three-frequency non-difference non-combined observation values. Background technique [0002] Time transfer is an important part of maintaining time synchronization between time laboratories and establishing and maintaining standard time scales. Time transfer accuracy is an important index to measure the performance of time synchronization, which affects the synchronization accuracy between time references. Time transfer methods include common-view time transfer and full-view time transfer, which are widely used in many time laboratories. However, they are all based on pseudo-range observations, and they also need to be based on satellite common-view conditions. The scope of action is limited. The traditional all-seeing method often uses an ionosphere-free combination, which amplifies the observation noise, and ...

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Problems solved by technology

Time transfer methods include common-view time transfer and full-view time transfer, which are widely used in many time laboratories. However, they are all based on pseudo-range observations, and they also need to be based on satellite common-view conditions. The scope of action is limited. The traditional all-seeing method often uses an ionosphere-free combination, which amplifies the observation noise, and the overall positioning and timing accuracy and reliability are low

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