A novel technique for estimating relative motion

A potential method for determining the information needed for a successful docking between two vehicles, for example, an orbit-to-orbit shuttle and a malfunctioning satellite, is described. The method involves a single TV, used to obtain all the necessary information for docking and stationkeeping. Four passive reflectors, designed so that the electronically scanned images are distinguishable, are mounted on the satellite to provide the only means of cooperation required between the satellite and the shuttle. The relations for obtaining range and rate data from TV data are set forth.