Ambiguity validation with combined ratio test and ellipsoidal integer aperture estimator |
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| Authors: | Shengyue Ji Wu Chen Xiaoli Ding Yongqi Chen Chunmei Zhao Congwei Hu |
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| Institution: | (1) Department of Land Surveying and Geo-Informatics, The Hong Kong Polytechnic University, Hong Kong, China;(2) Chinese Academy of Surveying and Mapping, Beijing, China |
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| Abstract: | To ensure reliable ambiguity resolution, ambiguity validation is an indispensable step. It has been a challenge for many years
and is far from being resolved. Over the past years, various ambiguity validation methods have been proposed, such as F-ratio test, R-ratio test, difference test, projector test, ellipsoidal integer aperture (EIA) estimator and penalized integer aperture
(PIA) estimator. In this paper, through analysis and testing, we find that, when the aperture region of EIA is not allowed
to be overlapped, the efficiency of ambiguity resolution with EIA is low and it is not applicable to fast static positioning
or real-time kinematic (RTK) applications. Then EIA with overlapped aperture regions is recommended and the resulted fail-rate
becomes upper bound of the actual one. After that, it is suggested that combined use of overlapped EIA and R-ratio test can increase the reliability of ambiguity resolution. Finally, numerical tests are carried out based on practical
buoy data and simulated Galileo data. |
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