Research on Self-Monitoring Method for Anomalies of Satellite Atomic Clock

Abstract

Atomic clock is the core component of navigation satellite payload, playing a decisive role in the realization of positioning function. So the monitoring for anomalies of the satellite atomic clock is very important. In this paper, a complete autonomous monitoring method for the satellite clock is put forward, which is, respectively, based on Phase-Locked Loop (PLL) and statistical principle. Our methods focus on anomalies in satellite clock such as phase and frequency jumping, instantaneous deterioration, stability deterioration, and frequency drift-rate anomaly. Now, method based on PLL has been used successfully in China’s newest BeiDou navigation satellite.

Development of a Miniaturized Frequency Standard Comparator Based on FPGA

“…It is undeniable that any specific device that generates standard values is not absolutely stable, and the frequency standard is no exception. Under the influences of internal and external factors, the frequency standard output will change slowly and eventually lead to the failure of its standard reference function [5][6][7][8][9][10]. In this case, it will need to be calibrated.…”