Geolocation of communications satellite interference

Interference from ground sources continues to be a serious problem for satellite communications operators. In this paper, algorithms for determining the geographic position of the source are discussed. One line of position can be derived from the time difference of arrival of signals received from two satellites spaced in longitude. A second line of position has to be determined from the north-south motion of the satellites due to the inclination of the orbit. Unfortunately most communications satellites are in a nearly geostationary orbit with very low inclination and have very little north-south motion. This paper describes algorithms that can be used to locate an earth based source of interference with acceptable accuracy given satellites with low inclination.