High precision timing and frequency calibration method based on satellite sharing RDSS and RNSS signals

Abstract

The invention discloses a high precision timing and frequency calibration method based on satellite sharing RDSS and RNSS signals. The method comprises the steps of (1) receiving the carrier signal frequency information of RNSS and RDSS signals at a same epoch time by a receiver, (2) carrying out combined calculation of carrier signal frequency information of the RNSS and RDSS signals at the same epoch time to obtain a local clock frequency error, (3) using the local clock frequency error to correct a local clock and obtaining the local frequency signal of a satellite ground center station clock reference level, (4) using a triple-frequency ionized layer correction method to current the ionized layer errors of the RNSS and RDSS signals in transmission, and obtaining a receiver 1PPS signal, (5) using the local frequency signal and the receiver 1PPS signal to carry out tampering processing, and obtaining a high precision 1PPS signal and a high stable frequency signal. According to the method, based on the characteristics of the satellite sharing RDSS and RNSS signals, the timing and frequency calibration with low cost and high precision can be realized.

Description

technical field [0001] The invention belongs to the technical field of geodesy in geophysics, and in particular relates to a high-precision time service and frequency calibration method based on RDSS and RNSS signals shared by satellites. Background technique [0002] With the development of science and technology, high-precision time and frequency transmission plays an increasingly important role in the development of the national economy. At present, satellite-based timing and frequency calibration technology has become the main method to achieve long-distance time synchronization due to its unique advantages such as high coverage and high precision. Continuously improving satellite timing and frequency calibration performance has important application value. At present, satellite-based time service and frequency correction methods mainly include three methods: one-way time service method, satellite common-view method and satellite two-way time comparison method. Among the...

AI Technical Summary

Problems solved by technology

[0005] 1. The influence of the ephemeris error of the satellite itself on the timing and frequency calibration accuracy cannot be eliminated;

[0006] 2. The influence of the residual error of the clock error model of the satellite itself on the timing and frequency calibration accuracy cannot be eliminated;

[0007] 3. A high-stable atomic clock needs to be equipped locally, and the accuracy of 1PPS is reduced by the clock training algorithm, and the time service of the traditional method is positively correlated with the calibration frequency accuracy and the accuracy level of the local high-stable atomic clock, and the cost is relatively high;

[0008] 4. High-stability atomic clocks are used under harsh conditions, and the conditions for traditional methods are limited

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