System and method for multiple range estimation location
First Claim
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1. A method of estimating the geographic location of a mobile device, wherein the mobile device communicates with a base station using a communication protocol, comprising the steps of:
- (a) observing at a first reference station, the time of transmission of a first signal from a base station to a mobile device;
(b) receiving at the first reference station, a timing parameter transmitted in the first signal;
(c) receiving at the first reference station, a second signal transmitted by the mobile device;
(d) determining the range of the mobile to the first reference station as a function of the received first signal, the timing parameter and the received second signal.
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Abstract
A system and method of determining the location of a mobile station by determining the time of transmission of a signal by a mobile station and determining range rings at a plurality of reference stations receiving the transmitted signal, where the range rings represent the distance f the mobile station from the plurality of reference stations.
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Citations
34 Claims
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1. A method of estimating the geographic location of a mobile device, wherein the mobile device communicates with a base station using a communication protocol, comprising the steps of:
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(a) observing at a first reference station, the time of transmission of a first signal from a base station to a mobile device; (b) receiving at the first reference station, a timing parameter transmitted in the first signal; (c) receiving at the first reference station, a second signal transmitted by the mobile device; (d) determining the range of the mobile to the first reference station as a function of the received first signal, the timing parameter and the received second signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of estimating the geographic location of a mobile device, wherein the mobile device communicates with a base station using a communication protocol, comprising the steps of
(a) observing at a first reference station, the time of transmission of a first signal from a base station to a mobile device; -
(b) receiving at the first reference station, a timing parameter; (c) receiving at the first reference station, a second signal transmitted by the mobile device; (d) determining the time of transmission of the second signal at the mobile device; (e) transmitting the determined time of transmission of the second signal from the first reference station to a plurality reference stations; (f) receiving at the plurality of reference stations the second signal; (g) determining the range of the mobile device to the plurality of reference stations as a function of the time of transmission of the second signal and the time of receipt of the second signal; and (h) determining the geographic location of the mobile device as a function of the determined ranges to the plurality reference stations. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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27. A system for estimating the geographic location of a mobile device, wherein the mobile device communicates with a base station using a communication protocol, comprising:
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a first monitoring unit at a known location for receiving transmissions from the mobile device and the base station, having a processor programmed; (i) to determine the time of transmission of a first signal from a base station to a mobile device; (ii) to identify a timing parameter transmitted in the first signal; (iii) to determine the time of receipt of a second signal transmitted from the mobile device; and (iv) to determine the range of the mobile device to the first monitoring unit as a function of the received first signal, the timing parameter and the received second signal. - View Dependent Claims (28, 29, 30)
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31. A computer program product for estimating the geographic location of a mobile device, wherein the mobile device communicates with a base station using a communication protocol, said computer program product comprising:
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a computer usable medium having computer readable program code modules embodied in said medium for estimating the geolocation of the mobile device; computer readable first program code module for causing a processor to determine the time of transmission of a first signal from a base station to a mobile device; computer readable second program code module for causing a processor to identify a timing parameter transmitted in the first signal; computer readable third program code module for causing a processor to determine the time of receipt of a second signal transmitted from the mobile device; and computer readable fourth program code module for causing a processor to determine the range of the mobile device to the first monitoring unit as a function of the received first signal, the timing parameter and the received second signal. - View Dependent Claims (32, 33, 34)
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Specification