Abstract: The GNSS carrier phase observation value is affected by noise and the receiver clock jump, the cycle slip test sequence changes over time.To construct robust and sensitive test of cycle slip, satellite data of different system quality need to be analyzed, and the multi-path effect and signal-to-noise ratio are important indexes of the quality about observation data. This paper focuses on the analysis of the multipath effect and the signal-to-noise ratio of GPS and BDS satellites data; and proposed a method of receiver clock jump detection, which uses the O-C about dual frequency phase observation value and performs clock jump detection by using the ionosphere free linear combination.

Key words: GNSS, multi-path, signal-noiseratio, clock jump, MGEX