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Evaluation the static precise point positioning and fixing rate with phase ambiguity resolution using different
Xingli Sun1,2, Jinjie Yao1, Zhiliang Yang1
1School of Information and Communication Engineering, North University of China, Taiyuan, Shanxi, China.
Plos One
|May 19, 2025
Summary
This study evaluates precise point positioning with phase ambiguity resolution (PPP-AR) products from multiple analysis centers. COD0_OPS_FIN, WUM0_MGX_RAP, and WUM0_MGX_FIN products demonstrated superior performance for GPS and Galileo positioning.
Area of Science:
- Geodesy and Geomatics Engineering
- Satellite Navigation Systems
Background:
- Precise Point Positioning with Ambiguity Resolution (PPP-AR) performance is critically dependent on the quality of analysis center (AC) products.
- Numerous International GNSS Service (IGS) and Multi-GNSS Experiment (MGEX) ACs now provide PPP-AR products, necessitating comprehensive evaluation.
Purpose of the Study:
- To comprehensively evaluate the positioning performance and ambiguity resolution (AR) fixing rates of various PPP-AR products from different ACs.
- To compare the performance of GPS-only and Galileo-only PPP-AR using a complete set of products from selected ACs.
Main Methods:
- Analysis of six PPP-AR products (COD0_MGX_FIN, COD0_OPS_FIN, GBM0_MGX_RAP, GRG0_OPS_FIN, WUM0_MGX_RAP, WUM0_MGX_FIN) from four ACs (CODE, GFZ, CNES, WHU).
- Utilized the open-source PRIDE PPP-AR software for processing 7 days of GPS and Galileo data from 42 globally distributed MGEX stations.
- Assessed positioning accuracy (East, North, Up, 3D components) and AR fixing rates (Wide-Lane and Narrow-Lane).
Main Results:
- For GPS-only, GBM0_MGX_RAP showed RMS values of approximately 3mm (East), 2mm (North), 4mm (Up), and 6mm (3D), while other products achieved ~2mm, ~2mm, ~4mm, and ~5mm respectively.
- GBM0_MGX_RAP exhibited a ~20% lower Narrow-Lane (NL) fixing rate for GPS-only compared to other products.
- Galileo-only positioning: Four products (excluding COD0_MGX_FIN and GBM0_MGX_RAP) achieved ~2mm (East), ~1.9mm (North), ~5.8mm (Up), and ~6.4mm (3D). COD0_MGX_FIN: ~2.4mm, ~2.2mm, ~5.9mm, ~6.7mm. GBM0_MGX_RAP: ~3.5mm, ~3.0mm, ~8.5mm, ~9.7mm.
- Galileo-only Wide-Lane (WL) and NL fixing rates exceeded 99% for five products, with GBM0_MGX_RAP at 97.24% (WL) and 92.56% (NL).
Conclusions:
- COD0_OPS_FIN, WUM0_MGX_RAP, and WUM0_MGX_FIN products ranked highest in overall performance for both GPS and Galileo PPP-AR.
- COD0_MGX_FIN and GRG0_OPS_FIN products demonstrated second-best performance.
- The GBM0_MGX_RAP product exhibited the comparatively worse performance in terms of positioning accuracy and AR fixing rates.
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