期刊
SURVEY REVIEW
卷 52, 期 374, 页码 442-453出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/00396265.2019.1634339
关键词
Precise point positioning (PPP); Wide-lane ambiguity resolution (WL-AR); Triple-frequency PPP; Multi-GNSS PPP; Partial ambiguity resolution (PAR)
资金
- Australia Award Scholarship Scheme
We assess the time-to-first-fix (TTFF) and the ambiguity fixing rate of two PPP wide-lane ambiguity resolution (WL-AR) methods, namely the geometry-based and ionospheric-free (GB-IF) method, and the geometry-free and ionospheric-free (GF-IF) method. First, an optimal GF-IF WL linear combination is selected based on the ratio between the code and carrier phase measurement noise (). Then, the relation between ambiguity variance and satellite geometry in the GB-IF WL-AR is investigated. Both simulated and real data from 31 GNSS stations over 37 consecutive days in 2017 were used. Numerical results show that the GF-IF WL-AR method has shorter TTFF and higher ambiguity fixing rate compared to the GB-IF method when . However, when , the GB-IF method outperforms the GF-IF method. Depending on RT values used, 2-10 min would be required to resolve the WL ambiguities when using GNSS measurements with one second sampling rate.
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