초록 ▼

The invention concerns a method of finding the position of a mobile radio-frequency transceiver in a communications system. A network of at least two unsynchronized base stations arranged to transmit/receive signals to at least one mobile-radio frequency transceiver; a reference receiver located at

The invention concerns a method of finding the position of a mobile radio-frequency transceiver in a communications system. A network of at least two unsynchronized base stations arranged to transmit/receive signals to at least one mobile-radio frequency transceiver; a reference receiver located at a known distance from the base stations and including measuring means to measure the times of arrival of signals transmitted from the base stations; determination means to use the known distances and measured times to determine the relative time offsets of transmissions from each base station; and location means to use the determined relative time offsets to calculate the position of a mobile transceiver in the network area using hyperbolic positioning techniques. A number of other enhancements to positioning systems relating to the usage of Doppler, carrier information, direction of arrival to improve the performance of mobile telephone-based positioning systems are also described.

대표청구항 ▼

[ What is claimed is:] [5.]5. A method of finding the position of a mobile radio-frequency transceiver in a communication system comprising a network of at least two base stations arranged to transmit the same signals, comprising the steps of:locating a reference receiver at known distances from the

[ What is claimed is:] [5.]5. A method of finding the position of a mobile radio-frequency transceiver in a communication system comprising a network of at least two base stations arranged to transmit the same signals, comprising the steps of:locating a reference receiver at known distances from the base stations;measuring the times of arrival at the reference receiver of signals transmitted from the base stations;determining the relative time offsets of transmissions from each base station, using the known distances and measured times; andcalculating the position of a mobile transceiver in the network area using the determined relative time offsets;said method comprising the additional step of synthesizing a wide aperture while the mobile transceiver is moving to provide additional information for position calculation.