Performance of GNSS positioning in PPP mode using MADOCA precise products

Abstract

The Global Navigation Satellite System (GNSS) is widely utilized for accurate positioning. One commonly applied method to obtain precise coordinate estimates is by implementing the relative positioning in network mode. However, this approach can be complex and challenging. Fortunately, The Japan Aerospace Exploration Agency (JAXA) offers freely available satellite orbit and clock correction products called Multi-GNSS Advanced Demonstration Tool for Orbit and Clock Analysis (MADOCA), which can enhance positioning accuracy through the precise point positioning (PPP) method. This study focuses on evaluating PPP static mode positioning using MADOCA products and comparing the results with the highly precise relative positioning method. By analyzing a network of 20 GNSS stations in Indonesia, we found that the PPP method using MADOCA products provided favorable positioning estimates. The median discrepancies and the corresponding median absolute deviation (MAD) for easting, northing, and up components were estimated as 9 ± 18 mm, 10 ± 9 mm, and 3 ± 40 mm, respectively. These results indicate that PPP with MADOCA products can be a reliable alternative for establishing Indonesia's horizontal control networks, particularly for orders 0, 1, 2, and 3, and for a broad spectrum of geoscience monitoring activities. However, considerations such as epoch transformations and seismic activities should be taken into account for accurate positioning applications that comply with the definition of the national reference framework.

Keywords

• Global Navigation Satellite System (GNSS)
• Precise point positioning (PPP)
• MADOCA
• Positioning evaluation