Satellite-ground precision time synchronization and carrier phase cycle slip detection method

Abstract

The invention provides a satellite-ground precision time synchronization and carrier phase cycle slip detection method. Carrier phase measurement and pseudo-range measurement between a ground station and a low-orbit spacecraft are realized by adopting a combination mode of three microwave links of single uplink and double downlink. Then cycle slip detection is carried out, wherein the cycle slip detection comprises three-frequency combined cycle slip detection and MW combined cycle slip detection; the cycle slip epochs determined by the three-frequency combined cycle slip detection and the MW combined cycle slip detection are combined and sorted, and all cycle slip epochs in the data are determined; according to simultaneous three groups of linearly independent inspection quantity equations, the cycle slip is calculated, and the cycle slip is repaired in the phase observation value; two-way time synchronization is realized based on carrier phase measurement, finally, an RMS value of a clock error fitting residual error is solved, the two-way time synchronization performance is evaluated by the RMS value, and high-precision satellite-ground two-way time synchronization is realized.

Description

technical field [0001] The invention belongs to the time-frequency technology and the space technology, and is mainly suitable for realizing precise time synchronization between the spacecraft and the ground in a high-dynamic environment. Background technique [0002] Commonly used long-distance time-frequency transmission methods mainly include two-way time difference measurement and time synchronization method, one-way time synchronization method, inverted positioning method and laser ranging method. These methods have their own characteristics, among which two-way time difference measurement and time synchronization method can achieve higher time synchronization accuracy. Lv Hongchun and others analyzed the satellite-ground two-way time synchronization accuracy under the inter-satellite link system in the article "Satellite-ground two-way time synchronization method under the inter-satellite link system", and its 1-week, 1-day and 1-hour clock difference fitting Accuracy...

AI Technical Summary

Problems solved by technology

The above traditional cycle slip detection and repair methods are only applicable to downlink data. In the triple frequency mode of single uplink and double downlink, there is no preprocessing of uplink data. The processing accuracy of single frequency in the traditional cycle slip detection and repair method is also relatively Low and not sensitive to the detection of small cycle slips. For example, if the single uplink and dual downlinks in the tri-band mode are processed separately, the cycle slips of each link cannot be guaranteed to be detected, and multiple combination detection processes are required to be locked. Therefore, it is impossible to obtain high-precision carrier phase data

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