The operation, development and application study on a satellite navigation system that provides precise position and timing information are continuously underway throughout the world. The advanced countries in space development, the United States, Russia, the EU and China, are already operating or building their own Global Navigation Satellite System (GNSS). India and Japan also operate their own Regional Navigation Satellite System (RNSS). India operates NavIC composed of 3 GEO and 4 IGSO satellites and QZSS, Japan’s RNSS, consists of 1 GEO and 3 EIGSO satellites. According to the recent trends, Korea has a plan to develop and build Korea Positioning System (KPS) based on The 3rd Basic Plan for Promotion of Space Development in order to guarantee the stability and improve the accuracy of satellite navigation service. The space segment of KPS will be composed of 3 GEO and 4 EIGSO satellites (Ahn et al. 2019). Here, the 7 satellites should be designed upon the careful considerations on the visibility, elevation angle, Dilution of Precision (DOP), and satellite tracking. In this paper, necessity condition of KPS satellite orbit and corresponding orbit parameters are provided, and the DOP and visible satellite over KPS coverage according to the change of orbital parameters are analyzed.

Keywords: GNSS, GPS, KPS, DOP, IGSO, EISGO