Abstract:

To meet the need of earth eclipse time determination in satellite navigation system’s state switching and solar radiation pressure modeling with orbit determination, this paper analysed the difference of cylindrical and conical model in eclipse factor and umbra duration calculation for GEO, IGSO, MEO three types of navigation satellites. And then the number of days suffering earth eclipse in a years’ time and the umbra duration in one day are analysed in order to obtain the relationship between orbit elements and earth eclipse status.

Key words: Geostationary Earth Orbit, Inclined Geo-Synchronous Orbit, Medium Earth Orbit, Conical shadow model, Cylindrical shadow model