Multifrequency algorithms for precise point positioning: MAP3



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Moreno Monge, Beatriz and Rodríguez Caderot, Gracia and Lacy de, M.C. (2014) Multifrequency algorithms for precise point positioning: MAP3. GPS solutions, 18 (3). pp. 355-364. ISSN 1080-5370

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We present the new MAP3 algorithms to perform static precise point positioning (PPP) from multifrequency and multisystem GNSS observations. MAP3 represents a two-step strategy in which the least squares theory is applied twice to estimate smoothed pseudo-distances, initial phase ambiguities, and slant ionospheric delay first, and the absolute receiver position and its clock offset in a second adjustment. Unlike the classic PPP technique, in our new approach, the ionospheric-free linear combination is not used. The combination of signals from different satellite systems is accomplished by taking into account the receiver inter-system bias. MAP3 has been implemented in MATLAB and integrated within a complete PPP software developed on site and named PCube. We test the MAP3 performance numerically and contrast it with other external PPP programs. In general, MAP3 positioning accuracy with low-noise GPS dual-frequency observations is about 2.5 cm in 2-h observation periods, 1 cm in 10 h, and 7 mm after 1 day. This means an improvement in the accuracy in short observation periods of at least 7 mm with respect to the other PPP programs. The MAP3 convergence time is also analyzed and some results obtained from real triple-frequency GPS and GIOVE observations are presented.

Item Type:Article
Uncontrolled Keywords:Precise point positioning; GNSS; Multifrequency algorithms; Complete covariance matrix; Least squares
Subjects:Sciences > Mathematics > Geodesy
ID Code:26686
Deposited On:11 Sep 2014 09:03
Last Modified:11 Sep 2014 09:03

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