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Open AccessArticle

Introduction of the Double-Differenced Ambiguity Resolution into Precise Point Positioning

College of Surveying and Geo-Informatics, Tongji University, Shanghai 200092, China
School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China
Shanghai Geological and Mineral Engineering Investigation Co., Ltd. Shanghai 200072, China
Author to whom correspondence should be addressed.
Remote Sens. 2018, 10(11), 1779;
Received: 5 October 2018 / Revised: 29 October 2018 / Accepted: 7 November 2018 / Published: 9 November 2018
(This article belongs to the Special Issue GPS/GNSS Contemporary Applications)
According to the advantages of the precise point positioning (PPP) and the double-differenced (DD) model based algorithm, a new method for the integration of DD integer ambiguity resolution into PPP is presented. This method uses the undifferenced ambiguity estimated with PPP computation and the DD ambiguity generated from the DD model based algorithm to realize the PPP ambiguity fixing. In the presented method, the selection of the undifferenced ambiguity bases on the ratio test of the DD ambiguity and the ratio values based weight is used in PPP processing. This ensures the quality of the used undifferenced ambiguity. To validate the presented method, two experiments are implemented using the ten days (11 to 20 August 2014) data from local and regional reference stations and the moved two receivers. The results of the presented strategy show that improvements are achieved in all three coordinate components. The 1-h, 2-h, and 4-h PPP results indicate that the mean relative improvements were about 19%, 18%, and 15% for north, east, and up components. These results also show that prominent improvements of 29%, 31%, and 25% for north, east, and up components were obtained when the ratio values based weight was used. The application of the presented method in the displacement monitoring was implemented with the experiment and it showed that the PPP estimation computed with the presented strategy benefits local or regional displacement monitoring and improves the detecting ability for displacement. View Full-Text
Keywords: precise point positioning (PPP); double-differenced (DD); undifferenced ambiguity precise point positioning (PPP); double-differenced (DD); undifferenced ambiguity
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MDPI and ACS Style

Li, H.; Xiao, J.; Zhang, S.; Zhou, J.; Wang, J. Introduction of the Double-Differenced Ambiguity Resolution into Precise Point Positioning. Remote Sens. 2018, 10, 1779.

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