초록 ▼

A method is disclosed for finding the position of a mobile radio-frequency transceiver in a communication system. A network of at least two unsynchronized base stations is arranged to transmit and receive signals to and from at least one mobile radio frequency transceiver. A reference receiver locat

A method is disclosed for finding the position of a mobile radio-frequency transceiver in a communication system. A network of at least two unsynchronized base stations is arranged to transmit and receive signals to and from at least one mobile radio frequency transceiver. A reference receiver located at a known distance from the base stations measures the times of arrival of signals transmitted from the base stations. Using the known distances and measured times, a determination is made of the relative time offsets of transmission from each base station. The determined relative time offsets are used to calculate the position of the mobile transceiver in the network area using hyperbolic positioning techniques. A number of other enhancements including the use of Doppler, carrier information, and direction of arrival to improve the performance of mobile telephone-based positioning systems are also described.

대표청구항 ▼

A method is disclosed for finding the position of a mobile radio-frequency transceiver in a communication system. A network of at least two unsynchronized base stations is arranged to transmit and receive signals to and from at least one mobile radio frequency transceiver. A reference receiver locat

A method is disclosed for finding the position of a mobile radio-frequency transceiver in a communication system. A network of at least two unsynchronized base stations is arranged to transmit and receive signals to and from at least one mobile radio frequency transceiver. A reference receiver located at a known distance from the base stations measures the times of arrival of signals transmitted from the base stations. Using the known distances and measured times, a determination is made of the relative time offsets of transmission from each base station. The determined relative time offsets are used to calculate the position of the mobile transceiver in the network area using hyperbolic positioning techniques. A number of other enhancements including the use of Doppler, carrier information, and direction of arrival to improve the performance of mobile telephone-based positioning systems are also described. 0, Taylor; US-5173743, 19921200, Kim; US-5208877, 19930500, Murphy et al.; US-5216739, 19930600, Hill et al.; US-5237630, 19930800, Hogg et al.; US-5250802, 19931000, Runner; US-5280172, 19940100, Di Bin et al.; US-5283852, 19940200, Gibler et al.; US-5313266, 19940500, Keolian et al., 356/345; US-5319435, 19940600, Melle et al.; US-5345456, 19940900, Dai et al.; US-5351324, 19940900, Forman; US-5361383, 19941100, Chang et al.; US-5367588, 19941100, Hill et al.; US-5380995, 19950100, Udd et al.; US-5384884, 19950100, Kashyap et al.; US-5394488, 19950200, Fernald et al.; US-5397891, 19950300, Udd et al.; US-5400422, 19950300, Askins et al.; US-5401956, 19950300, Dunphy et al.; US-5410404, 19950400, Kersey et al.; US-5420688, 19950500, Farah; US-5426297, 19950600, Dunphy et al.; US-5452087, 19950900, Taylor et al.; US-5493390, 19960200, Varasi et al.; US-5530666, 19960600, Kashyap et al.; US-5550654, 19960800, Erdogan et al.; US-5557406, 19960900, Taylor et al.; US-5581639, 19961200, Davies et al.; US-5591965, 19970100, Udd; US-5604629, 19970200, Hunter et al.; US-5620495, 19970400, Aspell et al.; US-5620496, 19970400, Erdogan et al.; US-5625472, 19970400, Mizrahi et al.; US-5633748, 19970500, Perez et al.; US-5633960, 19970500, Lagakos et al.; US-5636304, 19970600, Mizrahi et al.; US-5641956, 19970600, Vengsarkar et al.; US-5646401, 19970700, Udd; US-5657406, 19970800, Ball; US-5666372, 19970900, Ball et al.; US-5675674, 19971000, Weis, 250/227.18; US-5680489, 19971000, Kersey, 356/035.5; US-5684297, 19971100, Tardy; US-5694248, 19971200, Erdogan et al.; US-5694502, 19971200, Bryron; US-5694503, 19971200, Fleming et al.; US-5698848, 19971200, Belk, 250/227.11; US-5706079, 19980100, Kersey; US-5708498, 19980100, Rioux et al.; US-5712715, 19980100, Erdogan et al.; US-5714680, 19980200, Taylor et al.; US-5718738, 19980200, Kohnke et al.; US-5723857, 19980300, Underwood et al.; US-5745615, 19980400, Atkins et al.; US-5760391, 19980600, Narendran; US-5767411, 19980600, Maron; US-5770155, 19980600, Dunphy et al.; US-577