RT Journal Article
SR Electronic
T1 Enabling ambiguity resolution in CSRS-PPP
JF NAVIGATION: Journal of the Institute of Navigation
JO NAVIGATION
FD Institute of Navigation
SP 433
OP 451
DO 10.1002/navi.423
VO 68
IS 2
A1 Simon Banville
A1 Elyes Hassen
A1 Philippe Lamothe
A1 Justin Farinaccio
A1 Brian Donahue
A1 Yves Mireault
A1 Mohammad Ali Goudarzi
A1 Paul Collins
A1 Reza Ghoddousi-Fard
A1 Omid Kamali
YR 2021
UL https://navi.ion.org/content/68/2/433.abstract
AB Precise point positioning (PPP) uses precise satellite orbits, clock corrections and biases derived from a global network of reference stations to enable accurate positioning worldwide. Natural Resources Canada’s Canadian Spatial Reference System (CSRS) PPP is a free Web service offering automated PPP processing. A critical factor limiting the adoption of PPP in many applications is the convergence time needed to reach centimeter-level accuracies. To address this issue, CSRS-PPP now implements PPP with ambiguity resolution (PPP-AR). This feature required the development of new algorithms, such as sequential normal stacking for least-squares filtering/smoothing, and the weighted integer decision concept for ambiguity validation. New satellite product lines (ultra-rapid, rapid, final) also have been deployed to enable PPP-AR processing with various latencies. This analysis demonstrates that sub-centimeter horizontal accuracies can be obtained in less than one hour for both static and kinematic modes. Using product lines with longer latencies is beneficial, although improvements are typically within the reported uncertainties.