Unified ambiguity resolution method based on three PPP Models

• Main Authors: DU Zhenqiang, CHAI Hongzhou, XIANG Minzhi, YIN Xiao, LIU Chunhe
• Format: Article
• Language: zho
• Published: Surveying and Mapping Press 2020-07-01
• Series: Acta Geodaetica et Cartographica Sinica
• Subjects: precise point positioning; fcb; ambiguity resolution; unified method
• Online Access: http://html.rhhz.net/CHXB/html/2020-7-824.htm

The integer characteristics of the ambiguity can be recovered after the correction of fractional cycle biases (FCB), which can significantly shorten the initialization time of precise point positioning (PPP).However, the ambiguity resolution model of the clientend needs to be consistent with serverend, which may introduce the problem that the client maybe unable to use different FCB products and increases the transmission pressure of the server link. A unified PPP ambiguity resolution method is proposed that based on three PPP models,i.e.,ionosphere-free combination model, uncombined model without prior ionosphere constraint and uncombined model with prior ionosphere constraint.Different clients can use the same FCB product to achieve fast ambiguity resolution.A globally distributed network consisting of 116 MGEX stations is used to generates three kinds of FCB products at the server end, and 50 additional stations are selected at the client end for verification.The experimental results show that the new method solves the problem of ambiguity resolution of PPP at client end when facing different FCB products. Comparable performance with the traditional method can be achieved with regards to in positioning accuracy, convergence time and success rate.