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Sensors 2015, 15(6), 13627-13643;

Precise Point Positioning with Partial Ambiguity Fixing

School of Geodesy and Geomatics, Wuhan University, 129 Luoyu Road, Wuhan 430079, China
Author to whom correspondence should be addressed.
Academic Editor: Assefa M. Melesse
Received: 24 March 2015 / Revised: 1 June 2015 / Accepted: 4 June 2015 / Published: 10 June 2015
(This article belongs to the Section Remote Sensors)
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Reliable and rapid ambiguity resolution (AR) is the key to fast precise point positioning (PPP). We propose a modified partial ambiguity resolution (PAR) method, in which an elevation and standard deviation criterion are first used to remove the low-precision ambiguity estimates for AR. Subsequently the success rate and ratio-test are simultaneously used in an iterative process to increase the possibility of finding a subset of decorrelated ambiguities which can be fixed with high confidence. One can apply the proposed PAR method to try to achieve an ambiguity-fixed solution when full ambiguity resolution (FAR) fails. We validate this method using data from 450 stations during DOY 021 to 027, 2012. Results demonstrate the proposed PAR method can significantly shorten the time to first fix (TTFF) and increase the fixing rate. Compared with FAR, the average TTFF for PAR is reduced by 14.9% for static PPP and 15.1% for kinematic PPP. Besides, using the PAR method, the average fixing rate can be increased from 83.5% to 98.2% for static PPP, from 80.1% to 95.2% for kinematic PPP respectively. Kinematic PPP accuracy with PAR can also be significantly improved, compared to that with FAR, due to a higher fixing rate. View Full-Text
Keywords: partial ambiguity resolution; precise point positioning; success rate; ratio test; time to first fix; fixing rate partial ambiguity resolution; precise point positioning; success rate; ratio test; time to first fix; fixing rate

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Li, P.; Zhang, X. Precise Point Positioning with Partial Ambiguity Fixing. Sensors 2015, 15, 13627-13643.

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