Research on Receiver Clock Jump Detection and Processing in Precise Point Positioning

Abstract

The Melbourne-Wubbena (MW) and Geometry-Free (GF) combinations of observations are generally used to detect cycle slips in Precise Point Positioning (PPP). This article describes the GNSS receiver clock jump phenomenon, and analyzes its impact on MW and GF combined observations from the observation model. The experiment confirms that receiver clock jump will not affect GF combination observations, but will lead to a misjudgment of MW cycle slip detection; and changes are same for all satellites. This essay proposes a new method that uses satellite differenced MW together with the undifferenced MW and GF combinations to detect the clock jump in PPP; in the processing, clock jump is estimated with the coordinate parameters together. The experimental results show that this method can detect and estimate receiver clock jump, avoid unnecessary re-initialization and help to improve the positioning accuracy, effectively.KeywordsGNSS receiverPPPClock jumpCycle slip