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Recently, GPS radio occultation is one of the most active GPS and low Earth orbit satellite application. After the launch of COSMIC program, the area of utilization of GPS radio occultation has been expanded. Although, the amount of occultation data increases steadily and the occultation data are provided in near real-time, the demand of practical application of occultation requires more dense global coverage and real time data provision. Many new space missions that include GPS radio occultation instruments are planned and will be launched in the near future. One of them is the KOMPSAT-5 (KOrea Multi-Purpose SATellite-5) program. The KOMPSAT-5 carries a space-borne dual frequency GPS receiver and generates POD (Precision Orbit Determination) data and GPS radio occultation data. The KOMPSAT-5 program is the first space program with GPS occultation instrument in Korea and is expected to contribute to the global occultation observations. KASI (Korea Astronomy and Space Science Institute) is in charge of the development of a dual frequency GPS receiver and also an occultation science program for the KOMPSAT-5 mission. In this paper, we introduce the KOMPSAT-5 program and its payload for the GPS occultation mission. The occultation mission of KOMPSAT-5 and the occultation processing system currently being developed by KASI are also discussed.

Korea Astronomy and Space Science Institute, Daejeon, Korea e-mail: [email protected]

Fig. 1 KOMPSAT-5 program architecture

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