Patent ID: 6128501
Filing Date: 2000-10-03
Classification: G01S,H04W

Abstract:
Position-determining apparatus comprising:a position determination unit including a cellular mobile station coupled to a local satellite receiver,a cellular radio system including at least one immobile base station having a base station satellite receiver, the base station having a position determined relative to an eternal reference, the base station being arranged to transmit base station satellite data including data representing a carrier phase measurement derived from a satellite signal received by the base station satellite receiver to the mobile station via a cellular radio link and, the position determination unit being arranged to determine its position relative to the base station using local satellite data received by the local satellite receiver and to correct errors in this position determination using the base station satellite data, andan adjacent cell database associated with the base station for storing at least one of (a) the base station coordinate data of at least one immobile adjacent cell base station, and (b) base station satellite data generated by said at least one adjacent cell base station, the adjacent cell database being accessible to the base station to provide measurement correction data for the position of the base station itself.