GNSS satellite clock state of health monitoring method

Abstract

The invention discloses a GNSS satellite clock state of health monitoring method. Mutual effective verification can be performed for the satellite clock abnormal state by using multiple satellite clock difference data so that the problems of fault location difficulty, false alarm, early warning difficulty and poor timeliness causing various abnormal phenomena of the satellite clock can be solved,and long-term real-time monitoring of the state of health of the satellite clock can be realized. The method comprises the steps that the frequency and drift rate data are acquired through the primaryand secondary differential precision clock difference data, and the phase and frequency hop is detected by using the median method; fitting of the clock difference is performed by using the quadraticpolynomial so as to acquire the long time phase residual and the residual standard deviation; statistics of the frequency stability of the satellite clock is performed by using overlap hadamard variance; and finally various indexes are comprehensively evaluated, and the early warning information of the change of the satellite clock performance and the alarm information of the frequency and phasehop are given. The result proves that the satellite atomic clock state of health monitoring method using phase fitting residual based on multiple data sources is feasible.

Description

technical field [0001] The invention relates to a method for monitoring the health state of a GNSS satellite clock, which is suitable for satellite clock performance evaluation, satellite clock state monitoring and quality evaluation in a global continuous monitoring and evaluation system. Background technique [0002] GNSS is a system based on time measurement. As an important payload of the system, the satellite-borne atomic clock is the core of maintaining high-precision time-frequency, and is the on-board time reference for generating navigation signals and distance measurement. Its performance directly determines navigation, positioning and The quality of timing. Since the first atomic clock was put into space in 1974, there have been more than 500 atomic clocks in space. There are mainly three types of space-borne atomic clocks: cesium clocks, rubidium clocks and hydrogen clocks. These atomic clocks have undergone continuous research and development, and the performanc...

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Problems solved by technology

[0006] The problem to be solved by the technology of the present invention is: the present invention is based on a variety of satellite precision clock difference data and uses a phase quadratic polynomial fitting residual error of the spaceborne atomic clock health status monitoring method, using a variety of satellite clock difference data, the satellite clock can be monitored. The problems of each other are effectively verified, which solves the problems of difficult fault location, false alarm, difficult early warning and poor timeliness caused by various abnormal phenomena of satellite clocks, and realizes long-term real-time monitoring of the health status of satellite clocks

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