Method and system for locating a mobile radio receiver in a radio system with multiple transmitters
First Claim
1. A method of determining the location of a mobile receiver in one or more dimensions in a radio system which includes a network of transmitters the positions of which are known, the method comprising the steps of:
- a) detecting signals received from transmitters in the network which signals are above a predetermined power level, said detecting including decoding from each received signal information relating to the identity of the corresponding transmitter;
b) compiling a list of the information relating to the identity of said corresponding transmitters;
c) sending said list to a calculation device;
d) constructing a position function which relates to the probability that the receiver is at a given location, which position function has components corresponding to each member of the list, each component including a predetermined probability function that relates to the probability that the receiver is at a particular location given that said transmitter identity related information is in the said list; and
e) evaluating said position function to determine a position that corresponds to the highest probability of location, and defining that position to be the location of the mobile receiver.
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Accused Products
Abstract
A method of determining the location of a mobile receiver is provided. The method works within a radio system in one or more dimensions, the radio system includes a network of transmitters the positions of which are known. The method comprises the steps of: compiling a list of the signals detected by the receiver, sending said list to a calculation device; constructing a position function which relates to the probability that the receiver is at a given location, which position function has components corresponding to each member of the list, each component including a predetermined probability function that depends on mobile receiver position; and evaluating said position function to determine a position that corresponds to the highest probability of location, and defining that position to be the location of the mobile receiver.
91 Citations
26 Claims
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1. A method of determining the location of a mobile receiver in one or more dimensions in a radio system which includes a network of transmitters the positions of which are known, the method comprising the steps of:
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a) detecting signals received from transmitters in the network which signals are above a predetermined power level, said detecting including decoding from each received signal information relating to the identity of the corresponding transmitter;
b) compiling a list of the information relating to the identity of said corresponding transmitters;
c) sending said list to a calculation device;
d) constructing a position function which relates to the probability that the receiver is at a given location, which position function has components corresponding to each member of the list, each component including a predetermined probability function that relates to the probability that the receiver is at a particular location given that said transmitter identity related information is in the said list; and
e) evaluating said position function to determine a position that corresponds to the highest probability of location, and defining that position to be the location of the mobile receiver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 26)
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- 21. A mobile receiver device capable of detecting signals from a plurality of transmitters and arranged to compile a list of transmitter related information decoded from the signals received by the mobile receiver and to send said list, in use, to a calculation device.
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22. A calculation device for use in location determination of a mobile receiver, the calculation device being arranged to:
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a) receive a list of information decoded from signals, from the transmitters in the network, which have been received above a predetermined power level by the mobile receiver at a particular location, said decoded information relating to the identity of each of the corresponding transmitters, b) construct a position function which relates to the probability that the receiver is at a particular location given that said transmitter identity related information is in the said list, which position function has components corresponding to each member of the list, each component including a predetermined probability function that depends on the mobile receiver position; and
c) evaluate said position function to determine a position that corresponds to the highest probability of location, and defining that position to be the location of the mobile receiver.
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Specification