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 GSM receiver in one or more dimensions in a radio system which includes a network of GSM transmitters in which each of the transmitters transmit signals on a respective particular frequency and the positions of which transmitters are known, said GSM receiver configured to receive signals from said GSM transmitters, a mobile GSM and GSM network, the method comprising the steps of:
- a) detecting signals received by the mobile GSM receiver received from the transmitters that are visible in said network, a mobile GSM and GSM network, each of which visible signals is above a predetermined power level on its respective particular frequency and which can include signals from non-serving transmitters and a serving transmitter, said detecting including decoding from each of said received signals above said predetermined power level, information relating to the identity of the corresponding one of said transmitters in the network;
b) compiling, in the mobile receiver, a list of the visible transmitters including information relating to the identity of said corresponding transmitters;
c) sending said list to a calculation device;
d) creating in the calculation device a further list of transmitters which are in said network of GSM transmitters but not detected by the mobile receiver;
e) constructing a position function which relates to the probability that the receiver is at a given location, which has components corresponding to each transmitter in the list of visible transmitters, to each transmitter in the further list of transmitters not detected by the mobile receiver, each component including a predetermined probability function that relates to the probability that the receiver is at a particular location given the transmitters in said list and said further list; and
f) 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.
24 Citations
23 Claims
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1. A method of determining the location of a mobile GSM receiver in one or more dimensions in a radio system which includes a network of GSM transmitters in which each of the transmitters transmit signals on a respective particular frequency and the positions of which transmitters are known, said GSM receiver configured to receive signals from said GSM transmitters, a mobile GSM and GSM network, the method comprising the steps of:
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a) detecting signals received by the mobile GSM receiver received from the transmitters that are visible in said network, a mobile GSM and GSM network, each of which visible signals is above a predetermined power level on its respective particular frequency and which can include signals from non-serving transmitters and a serving transmitter, said detecting including decoding from each of said received signals above said predetermined power level, information relating to the identity of the corresponding one of said transmitters in the network; b) compiling, in the mobile receiver, a list of the visible transmitters including information relating to the identity of said corresponding transmitters; c) sending said list to a calculation device; d) creating in the calculation device a further list of transmitters which are in said network of GSM transmitters but not detected by the mobile receiver; e) constructing a position function which relates to the probability that the receiver is at a given location, which has components corresponding to each transmitter in the list of visible transmitters, to each transmitter in the further list of transmitters not detected by the mobile receiver, each component including a predetermined probability function that relates to the probability that the receiver is at a particular location given the transmitters in said list and said further list; and f) 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)
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20. A system comprising a mobile receiver device and a calculation device, wherein the mobile receiver device is a mobile GSM receiver device configured to detect signals from a plurality of GSM transmitters, each of the transmitters transmits signals on a respective particular frequency in a GSM network, the positions of which transmitters are known, and arranged to compile a list of visible transmitters including corresponding transmitter related information decoded from the signals received by the mobile GSM receiver;
- about a mobile GSM and GSM network, and to send said list, in use, to a calculation device, each of the transmitted signals received by the mobile GSM receiver having been received above a predetermined power level by the mobile GSM receiver at a particular location where the signals can include signals from non-serving transmitters and a serving transmitter, a mobile GSM and GSM network, the calculation device determines location of the mobile GSM receiver in one or more dimensions in a radio system which includes the network of GSM transmitters in which each of the transmitters transmits signals on a respective particular frequency and the positions of which transmitters are known, and the calculation device is arranged to;
a) receive, from the mobile GSM receiver, a list of the transmitters that are visible in said network to the receiver, said list including information decoded from each of said signals on a respective particular frequency from the transmitters visible in said network, and each of which respective signals have been received above a predetermined power level by the mobile GSM receiver at a particular location where the signals can include signals from non serving transmitters and a serving transmitter, said decoded information relating to the identity of each of the corresponding transmitters, b) create a further list of transmitters which are in said network of GSM transmitters but not detected by the mobile receiver, c) construct a position function which relates to the probability that the mobile GSM receiver is at a particular location given the transmitters in said list, which position function has components corresponding to each transmitter in the list and to each transmitter in the further list of transmitters not detected by the mobile receiver, each component including a predetermined probability function that depends on the mobile GSM receiver position, and d) 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 GSM receiver. - View Dependent Claims (21, 22)
- about a mobile GSM and GSM network, and to send said list, in use, to a calculation device, each of the transmitted signals received by the mobile GSM receiver having been received above a predetermined power level by the mobile GSM receiver at a particular location where the signals can include signals from non-serving transmitters and a serving transmitter, a mobile GSM and GSM network, the calculation device determines location of the mobile GSM receiver in one or more dimensions in a radio system which includes the network of GSM transmitters in which each of the transmitters transmits signals on a respective particular frequency and the positions of which transmitters are known, and the calculation device is arranged to;
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23. A method of determining the location of a mobile GSM receiver in one or more dimensions in a radio system which includes a network of GSM transmitters in which each of the transmitters transmits transmitting signals on a respective particular frequencies frequency and the positions of which transmitters are known, said GSM receiver configured to receive signals from said GSM transmitters, the method comprising the steps of:
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a) detecting signals received by the mobile GSM receiver from the transmitters that are visible in said network, each of which visible signals are is above a predetermined power level on its respective particular frequency and which can include signals from non-serving transmitters and a serving transmitter, said detecting including decoding, from each of said received signals above said predetermined power level, information relating to the identity of the corresponding one of said transmitters in the network; b) compiling, in the mobile receiver, a list of the visible transmitters including information relating to the identity of said corresponding transmitters; c) sending said list to a calculation device; d) creating in the calculation device a further list of transmitters which are in said network of GSM transmitters but not detected by the mobile receiver; e) constructing a position function which relates to the probability that the receiver is at a given location and which has components corresponding to each transmitter in the list of visible transmitters and to each transmitter in the further list of transmitters not detected by the mobile receiver, each component including a predetermined probability function that relates to the probability that the receiver is at a particular location given the transmitters in said list and said further list; and f) 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, wherein said the list of signals includes a list of frequencies on which the signals were received.
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Specification