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Remote Sens. 2017, 9(11), 1108; https://doi.org/10.3390/rs9111108

Improving the Triple-Carrier Ambiguity Resolution with a New Ionosphere-Free and Variance-Restricted Method

1
College of Automation, Harbin Engineering University, Harbin 150001, China
2
Academy of Opto-Electronics, Chinese Academy of Sciences, Beijing 100094, China
*
Author to whom correspondence should be addressed.
Received: 22 September 2017 / Revised: 24 October 2017 / Accepted: 25 October 2017 / Published: 30 October 2017
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Abstract

The ionospheric bias and the combined observation noise are two crucial factors affecting the reliability of the triple-carrier ambiguity resolution (TCAR). In order to obtain a better reliability of TCAR, a new ionosphere-free and variance-restricted TCAR method is proposed through exploring the ambiguity link between each step of TCAR. The method constructs an ionosphere-free combination and simultaneously restricts the combined observation noise with respect to the wavelength to a sufficiently low level for each step of TCAR. The performance of the proposed method is tested by the datasets from the BeiDou navigation satellite system (BDS), with the baseline varying from 7.7 km to 68.8 km. Comparing with the state-of-the-art TCAR methods, the experimental results indicate that the proposed method can obtain a better performance of ambiguity resolution, even though the double-differenced ionospheric delay increases up to 72.4 cm at the baseline of 68.8 km. View Full-Text
Keywords: triple-carrier ambiguity resolution (TCAR); ionosphere-free; carrier phase; precise positioning; BeiDou navigation satellite system (BDS) triple-carrier ambiguity resolution (TCAR); ionosphere-free; carrier phase; precise positioning; BeiDou navigation satellite system (BDS)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Jia, C.; Zhao, L.; Li, L.; Li, H.; Cheng, J.; Li, Z. Improving the Triple-Carrier Ambiguity Resolution with a New Ionosphere-Free and Variance-Restricted Method. Remote Sens. 2017, 9, 1108.

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