4.5 Article

Global single-epoch narrow-lane ambiguity resolution with multi-constellation and multi-frequency precise point positioning

期刊

GPS SOLUTIONS
卷 27, 期 1, 页码 -

出版社

SPRINGER HEIDELBERG
DOI: 10.1007/s10291-022-01368-3

关键词

Global single-epoch narrow-lane ambiguity resolution; Global single-epoch wide-lane ambiguity resolution; Multi-constellation; Multi-frequency; Precise point positioning

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Automatic driving has created a great demand for global instantaneous high-precision precise point positioning (PPP). This article proposes a new approach using multi-constellation and multi-frequency wide-lane ambiguity resolution (PPP-WAR) to achieve global single-epoch narrow-lane (NL) ambiguity resolution. Experimental results show that increasing the frequency leads to significantly improved instant positioning accuracies, which is beneficial for global autonomous driving vehicles.
Automatic driving has led to a great demand for global instantaneous high-precision precise point positioning (PPP). To achieve global instantaneous high-precision PPP, such as centimeter-level accuracy, global single-epoch narrow-lane (NL) ambiguity resolution (AR) is needed, which is quite difficult due to the limited accuracy of global atmospheric corrections. Multi-constellation and multi-frequency PPP wide-lane (WL) AR (PPP-WAR) provides a new approach to global single-epoch NL AR without atmosphere corrections because the instant NL ambiguity accuracies will be improved by fixing many WL ambiguities instantaneously. In this article, the uncombined PPP cascading WL/NL AR method (PPP-CAR) was extended to GPS, Galileo, BDS-2, and BDS-3 all-frequency signals to investigate global single-epoch NL AR with global public stations. The test results indicated that the instant positioning accuracies improved substantially with increasing frequencies for the single-epoch multi-frequency PPP-CARs, attributed to the contribution of the additional frequency observations. However, the same fixing rates of the NL ambiguities of 99.8% in all epochs were achieved for the single-epoch multi-frequency PPP-CARs, demonstrating that more reliable single-epoch NL ARs were reached with increasing frequencies. Only decimeter-level instant positioning accuracies were achieved for the dual-frequency, triple-frequency, and quad-frequency PPP-CARs. A centimeter-level global horizontal instant positioning accuracy of 0.07 and 0.08 m in the east and north components, respectively, was achieved by the five-frequency PPP-CAR for the first time. These results are very encouraging because better positioning is expected for global autonomous driving vehicles by integrating the multi-constellation all-frequency signals with other sensors, such as an inertial sensor.

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