LEI Yu1,2, GAO Yu-ping1,2, LIU Na1,2

(1. National Time Service Center, Chinese Academy of Sciences, Xi′an 710600, China;

2. Key Laboratory of Time and Frequency Primary Standards, National Time Service Centre,

Chinese Academy of Sciences, Xi′an 710600, China)

Abstract: There are many methods to detect and repair the cycle slips in GPS carrier data, but none of the methods is perfect. The commonly used methods for detecting and repairing the cycle slips are briefly introduced, and the tests of detecting and repairing the cycle slips have been conducted with the differenced phase method and phase-rate method. The results show that both the two methods not only can exactly detect the epoch when small cycle slips take place, but also can repair the carrier phase value efficiently; however the differenced phase method needs the dual frequency carrier-phase data whereas the phase-rate just needs single frequency data.

Key words: cycle slip detection and reparation; carrier-phase; differenced phase; phase-rate