169 / 2023-08-30 23:27:44

Assessing the performance of multi-GNSS Precise Point Positioning Ambiguity Resolution with different products

ppp,ambiguity resolution,analysis centers,multi-GNSS

The technology of Precise Point Positioning Ambiguity Resolution (PPP-AR) effectively addresses the issues of low accuracy in float PPP positioning and long convergence time. Consequently, it has gained wide application in precise positioning. Moreover, an increasing number of analysis centers (ACs) have publicly released PPP-AR products, facilitating GNSS researchers to study PPP-AR. Nonetheless, how to select the appropriate PPP-AR product from the multitude of available options has yet to be thoroughly examined. In order to assist users in selecting the PPP-AR product with the best performance, this paper firstly presents detailed methods for PPP-AR, along with an introduction to the application of different PPP-AR products. In addition, we evaluate the PPP-AR performance in terms of positioning accuracy, convergence time, Time to First Fix (TTFF), and ambiguity fixing rate in GPS-only (G), Galileo-only (E) and GPS, Galileo, BDS-2/BDS-3 (G/E/C) multi-GNSS combination with different PPP-AR products from each AC. The results show that WHU-OSB products have the best positioning accuracy for GPS-only, 49.0 %, 32.5 %, 15.3 % increasing compared with float solution. For Galileo-only, GBM-IRC products mainly improve the East (E) and North (N) positioning accuracy with 41.6 % and 20.5 %. For G/E/C combinations, WHU-OSB products perform best, increasing 32 %、34.7 % and 17.1 %. In addition, the convergence time of GPS-only is shorter than Galileo-only, and with the addition of BDS-2/BDS-3 could further improve the convergence time of PPP-AR.