Patent ID: 6529165
Filing Date: 2003-03-04
Classification: G01S,H04W

Abstract:
A method of determining the positions of receivers, the positions of which are not already known, in a network of transmission sources some or all of the positions of which ate known, the method comprising:(a) at a first time, measuring a first set of offsets in time or phase between signals received by a first receiver, the position of which is not already known, from a plurality of the transmission sources and a signal received by said first receiver from another of said transmission sources or a reference source; (b) at a selected second time, measuring a second set of offsets in time or phase between signals received by a second receiver, the position of which is not already known, from the plurality of the transmission sources and a signal received by said second receiver from another of said transmission sources or a reference source; and (c) calculating the positions of the first and second receivers from the relationship between the first and second sets of offsets.