Passive ranging system for orbit determination of geosynchronous satellite

A new ranging system for geosynchronous satellites has been developed. In this system, the distance between geosynchronous satellite and ground station is measured by the correlation of "real" up-link and down-link satellite communication signal. Therefore, "special" ranging signal or modification of communication signal are not required. This "passive" ranging system enables the frequency band occupied by the ranging signal to be used for the communication service. (4 pages)