Comparison of Short-term Stability Estimation Methods of GNSS On-board Clock

【摘要】：The short-term frequency stability of satellite on-board clock is of great significance for GNSS applications,such as satellite clock modeling,simulation and clock offset prediction.In this paper,four short-term frequency stability esti-mation methods are analyzed,which need observation data from only one station in contrast with ODTS needing continuous observation of large ground monitoring networks.Performance and accuracy of all these four methods is analyzed and compared using GPS and COMPASS observation data,and their advantage and disadvantage are discussed correspondingly.For COMPASS and Galileo systems which are currently in the early stage of construction,this paper proposes some meaningful suggestions of on-board clock short-term frequency stability estima-tion.