Real time precise point positioning based on the QZSS MADOCA-LEX signal

This study assessed the satellite orbit and clock corrections of the L-band experiment (LEX) signal correction messages broadcasted by the Japan Quasi-Zenith Satellite System (QZSS) by comparing them with those of the international global navigation satellite system (GNSS) service real-time (IGS-RT) products. Using datasets collected at a fixed static station and a kinematic vehicle experiment, the authors evaluated the application of multi-GNSS advanced demonstration of orbit and clock analysis (MADOCA) products in precise point positioning (PPP) through static and kinematic data processing modes. The results show that the MADOCA-LEX products bring slightly larger root mean square and standard deviation of three-dimensional positions than the IGS-RT products. For kinematic PPP positioning, the convergence time was longer than IGS-RT products. However, from the global scope, the positioning accuracy of the MADOCA-LEX products, at a level of 20 cm, is comparable with that of the IGS-RT products, which satisfies the need of global PPP.