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International Journal of Aerospace Engineering
Volume 2016, Article ID 1759512, 16 pages
http://dx.doi.org/10.1155/2016/1759512
Research Article

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

Lei Feng1,2 and Guotong Li2,3

1Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
2Shanghai Engineering Center for Microsatellite, Shanghai 201203, China
3Shanghai Tech University, Shanghai 201203, China

Received 25 February 2016; Revised 14 June 2016; Accepted 29 June 2016

Academic Editor: Paolo Tortora

Copyright © 2016 Lei Feng and Guotong Li. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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.