Development and Evaluation of the Precise Orbit and Clock Determination Software MADOCA
Abstract
The Japan Aerospace Exploration Agency (JAXA) has been developing the precise orbit and clock determination (POD) software named MADOCA (Multi-GNSS Advanced Demonstration tool for Orbit and Clock Analysis) since 2011, in order to realize the high-accuracy precise point positioning (PPP). The MADOCA is designed to deal with five GNSS system, GPS, GLONASS, QZSS, Galileo and BeiDou, and can generate their orbit and clock product for offline and real-time use. The specification of MADOCA POD accuracy is that GPS and GLONASS/QZSS (only QZS-1) as 3 cm and 7 cm for the offline product, and 6 cm and 9 cm for the real-time product in 3D-RMS with referenced to IGS product. The tentative specification of Galileo and BeiDou (exclude GEO) as 7 cm and 9 cm for the offline product, and 9 cm and 11 cm for the real-time product. At this moment, we are basically generating two type combination products, GPS, GLONASS, QZSS and GPS, Galileo, BeiDou. Furthermore, there are three types in offline product and two types in real-time product. The differences of these products are estimation arc-length, estimation interval, number of stations, and processing interval etc. Since September 2014, JAXA is providing these MADOCA products (only GPS, GLONASS, QZSS combination) to user via network. About these MADOCA products, we are evaluating by compare with IGS and other analysis center's products every day. The orbit accuracy of GPS and GLONASS products almost meet the specification value and are same level as the IGS final products. However, QZSS orbit has a few ten cm biases with other AC's products. About Galileo and BeiDou, we are still under adjusting the estimation parameters. In Japan, the usefulness of MADOCA products is recognized to user gradually. Currently, MADOCA products contribute the daily weather forecast. Also, some geophysical projects are planning to use MADOCA products. For example, GNSS buoy array, PWV retrieval over the ocean, and rapid earthquake moment estimation, etc. In this presentation, we explain the details of MADOCA processing strategy and their evaluation results. Also, we show our research to improve the POD accuracy like improvement of solar radiation pressure model. Acknowledgments: We cooperated with Lighthouse Technology and Consulting Co., Ltd. and Space Engineering Development Co., Ltd. in doing this study.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFM.G12A..03T
- Keywords:
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- 1223 Ocean/Earth/atmosphere/hydrosphere/cryosphere interactions;
- GEODESY AND GRAVITY;
- 1229 Reference systems;
- GEODESY AND GRAVITY;
- 1241 Satellite geodesy: technical issues;
- GEODESY AND GRAVITY;
- 1243 Space geodetic surveys;
- GEODESY AND GRAVITY