Abstract: According to the rules of satellite orbit resource of ITU, the satellite operator may move a satellite to another different orbit position and keep it for at least 90 days to enable the frequency assignment of the orbit slots. This kind of orbit maneuver is called “spectrum/orbit occupation” which is a common phenomenon of communication satellites. The INTELSAT series satellites are chosen as the research object via two line elements (TLE) and SGP4/SDP4 model to calculate 67 INTELSAT's orbital data. And the method based on density and knearest neighbor outlier detection is proposed to filter data outliers, which can improve the data accuracy. Counting and analyzing these satellites' spectrum/orbit occupation, it is proposed that Chinese satellite operators should take advantage of international rules to safeguard space rights.

Key words: geosynchronous orbit, communication satellite, spectrum/orbit occupation