COMPARATIVE PERFORMANCE ANALYSIS OF LOW-COST AND REAL-TIME MADOCA-PPP RECEIVER SYSTEMS FOR PRECISE POINT POSITIONING

Abstract

The Quasi-Zenith Satellite System (QZSS) is a regional satellite positioning and timing system that provides GNSS interoperable and augmentation signals in the Asia-Pacific region. This study evaluates the performance of the MADOCA-LEX (Multi-GNSS Advanced Demonstration Tool for Orbit and Clock Analysis - L-Band Experimental) signal in a low-cost receiver, u-blox C099 ZED-F9P, compared to survey-grade receivers in a post-processed solution. The demand for affordable receivers with high precision and accuracy has been increasing, and previous studies have shown promising results with low-cost receivers using single-frequency, dual-frequency, and triple-frequency GPS systems. However, the performance of these receivers with QZSS signals, specifically MADOCA-LEX, has not been extensively evaluated. The study also examines the performance of the MSJ-3008-GM 4-QZS receiver, developed by Magellan Systems Japan, Inc., in real-time mode by comparing it to the Trimble NetR9 receiver in a post-process solution. The evaluation of the MSJ-3008-GM 4-QZS receiver is being conducted in multiple countries in the East Asia and Oceania Region. Furthermore, the availability of the MADOCA-LEX signal in the Philippines is tested, building upon an initial test conducted by Reyes et al. The study aims to determine the potential of low-cost receivers using MADOCA-PPP (Precise Point Positioning) as substitutes for survey-grade receivers and base stations, offering centimeter-level accuracy with reduced operational costs.The experiments were conducted in an open-sky environment using only one antenna for simultaneous observations with GPS, GLONASS, and QZSS satellite systems. The solutions were evaluated against the true position of the Trimble NetR9 base station to assess accuracy. The findings from this study contribute to the understanding of the performance and potential applications of MADOCA-LEX in low-cost receivers, shedding light on the feasibility of using such receivers for precise positioning in various fields