Frequency Drift Correction Methods of Spaceborne Rubidium Atomic Frequency Standard

Abstract

With the wide application of rubidium atomic frequency standard in satellite navigation system, its excellent short-term stability provides a high-precision clock source for navigation and positioning. Along with the further application of rubidium atomic frequency standard and the demand of autonomous navigation, how to effectively overcome the frequency drift of rubidium atomic frequency standard has become an urgent problem. In this paper, the rubidium atomic frequency standard characteristics of the actual work are specifically analyzed, and the method of frequency drift correction is studied, in order to find a reasonable way, so as to give full play to the role of RAFS in navigation and positioning. Several classical methods of frequency modification are listed by analyzing the specific frequency change process of spaceborne rubidium atomic frequency standard, and puts forward the way of frequency drift correction by using Kalman filter method. Simulation results show that this method can significantly improve the frequency drift of rubidium atomic frequency standard.