Patent ID: 6342854
Filing Date: 2002-01-29
Classification: G01S

Abstract:
A position determining system, for receiving broadband telecommunication signals transmitted by a plurality of transmission sources at fixed positions equal at least to a number of dimensions in which movement of a mobile telecommunications transceiver is to be monitored, the system comprising:first and second receiving stations, the first receiving station being at a known position and the second receiving station comprising said mobile telecommunications transceiver, each of the receiving stations being arranged to receive and record portions of the telecommunication signals from the respective plurality of transmission sources substantially simultaneously; a position determining processor; said first receiving station having means for transmitting a first link signal from the first receiving station to the position determining processor and said second receiving station having means for transmitting a second link signal from the second receiving station to the position determining processor, the first link signal containing information derived from the recorded telecommunication signals received at the first receiving station from the plurality of transmission sources and the second link signal containing information derived from the recorded telecommunication signals received at the second receiving station from the plurality of transmission sources; and wherein the position determining processor is arranged to compare the information received from the first link signal with the information received from the second link signal, and to determine a time delay between the respective telecommunication signals received and recorded at the first and second receiving stations in order to determine the position of the mobile telecommunications transceiver.