Evaluation the static precise point positioning and fixing rate with phase ambiguity resolution using different analysis centers products.

Abstract

The performance of precise point positioning with phase ambiguity resolution (PPP-AR) strongly depends on the quality of analysis centers (ACs) products. Nowadays, many IGS/MGEX ACs provide PPP-AR products. To give a full evaluation of PPP-AR performance with various products, this work comprehensively investigates the positioning performance and AR fixing rate of GPS-only and Galileo-only with a complete set of products using open-source software PRIDE PPP-AR. We analyze six products, including COD0_MGX_FIN, COD0_OPS_FIN, GBM0_MGX_RAP, GRG0_OPS_FIN, WUM0_MGX_RAP, and WUM0_MGX_FIN, from four ACs: CODE, GFZ, CNES, and WHU. Then, 7 days of GPS and Galileo data were collected from 42 globally distributed MGEX stations. The root mean square (RMS) value of GBM0_MGX_RAP product for GPS-only reached about 3 mm, 2 mm, 4 mm, and 6 mm in east, north, up, and 3D components, respectively. The other five products have reached about 2 mm, 2 mm, 4 mm, and 5 mm, respectively. Compared to other products, the narrow-lane (NL) fixing rate of the GBM0_MGX_RAP product is about 20% lower for GPS-only. The Galileo-only positioning using four products (except COD0_MGX_FIN and GBM0_MGX_RAP) reached about 2 mm, 1.9 mm, 5.8 mm, and 6.4 mm in east, north, up, and 3D components, respectively, COD0_MGX_FIN reached 2.4 mm, 2.2 mm, 5.9 mm, and 6.7 mm, respectively. GBM0_MGX_RAP reached about 3.5 mm, 3.0 mm, 8.5 mm, and 9.7 mm, respectively. The wide-lane (WL) and NL fixing rate of Galileo-only showed five products have all exceeded 99%, the GBM0_MGX_RAP product is 97.24% and 92.56%, respectively. Overall, COD0_OPS_FIN, WUM0_MGX_RAP, and WUM0_MGX_FIN products rank first, COD0_MGX_FIN and GRG0_OPS_FIN take the second place, while those with the GBM0_MGX_RAP shows the worse performance.