Research on Receiver Clock Jump Detection and Processing in Precise Point Positioning
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 G
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Research on Receiver Clock Jump Detection and Processing in Precise Point Positioning Rui Zhang, Yibin Yao, Runan Wu and Weiwei Song
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. Keywords GNSS receiver
PPP Clock jump Cycle slip
13.1 Introduction Using Single GNSS receiver’s observation data, the users can achieve high accuracy positioning both real time and afterwards with precise satellite ephemeris and clock correction product at any position of the global scope, which is called R. Zhang (&) Y. Yao School of Geodesy and Geomatics, Wuhan University, Wuhan, China e-mail: [email protected] R. Wu State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan, China W. Song Research Center of GNSS, Wuhan University, Wuhan, China
J. Sun et al. (eds.), China Satellite Navigation Conference (CSNC) 2013 Proceedings, Lecture Notes in Electrical Engineering 245, DOI: 10.1007/978-3-642-37407-4_13, Ó Springer-Verlag Berlin Heidelberg 2013
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the precise point positioning (PPP). PPP has more advantages compared with relative positioning mode, such as: supply more available observations and preserve the original observation information; get the receive station coordinates directly, at the same time, estimated coordinates of each station are uncorrelated, which is easy for quality control [1]. After the satellite signal is captured by GNSS receiver, as long as the tracking is not interrupted, the receiver will automatically give the carrier phase changes during tracking. High-precision positioning results will be obtained using continuous phase observations. Therefore, in PPP solution, it is very necessary to pretreat the observations before coordinate estimated. The quality of pretreatment will directly determine the positioning accuracy and reliability. A lot of methods have been proposed for cycle slip and gross error detection up till now, such as: differential method, Doppler frequency shift method, Kalman filtering method and so on [2]. Among all these, the turbo-edit algorithm proposed by Blewitt is most widely used in PPP, which uses the MW and GF combined
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