System and method for total flight time ratio pattern matching
First Claim
1. A method of estimating the location of a mobile device comprising the steps of:
- (a) determining the time of transmission of a first signal from a base station;
(b) receiving the first signal at the mobile device;
(c) transmitting a second signal from the mobile device, the second signal being a function of the first signal advanced by a timing parameter;
(d) determining a time of receipt of the second signal at a first reference station;
(e) determining a first range of the mobile device from the first reference station as a function of the determined time of transmission of the first signal and the determined time of receipt of the second signal;
(f) providing a plurality of grid points in a geographic region, the plurality of grid points containing the first reference station;
(g) determining a first relationship between the determined first range and a first range metric for each of the plurality of grid points;
(h) determining a second relationship based on an ideal range from the first reference station to each of the plurality of grid points;
(i) comparing the first and second relationships; and
(j) determining a location of the mobile device as a function of the comparison of the first and second relationships.
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Accused Products
Abstract
A method and system for estimating the location of a mobile device. A range of the mobile device to a reference station may be determined as a function of the time of transmission of a first signal transmitted from a base station and as a function of the time of receipt of a second signal transmitted from the mobile device to the reference station, the second signal being a function of the first signal advanced by a timing parameter. A relationship for each of a plurality of grid points in a geographic region may be determined as a function of the determined range and a range metric. These plural grid points may contain the reference station. The determined relationship may be compared with data corresponding to each of the plural grid points, and a location of the mobile device determined as a function of the comparison.
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Citations
22 Claims
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1. A method of estimating the location of a mobile device comprising the steps of:
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(a) determining the time of transmission of a first signal from a base station; (b) receiving the first signal at the mobile device; (c) transmitting a second signal from the mobile device, the second signal being a function of the first signal advanced by a timing parameter; (d) determining a time of receipt of the second signal at a first reference station; (e) determining a first range of the mobile device from the first reference station as a function of the determined time of transmission of the first signal and the determined time of receipt of the second signal; (f) providing a plurality of grid points in a geographic region, the plurality of grid points containing the first reference station; (g) determining a first relationship between the determined first range and a first range metric for each of the plurality of grid points; (h) determining a second relationship based on an ideal range from the first reference station to each of the plurality of grid points; (i) comparing the first and second relationships; and (j) determining a location of the mobile device as a function of the comparison of the first and second relationships. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of estimating the location of a mobile device comprising the steps of:
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(a) determining the time of transmission of a first signal from a base station; (b) receiving the first signal at the mobile device; (c) transmitting a second signal from the mobile device, the second signal being a function of the first signal advanced by a timing parameter; (d) determining a time of receipt of the second signal at a first reference station; (e) determining a first range of the mobile device from the first reference station as a function of the determined time of transmission of the first signal and the determined time of receipt of the second signal; (f) providing a plurality of grid points in a geographic region, the plurality of grid points containing the first reference station; (g) determining a first relationship between the determined first range and a first range metric for each of the plurality of grid points; (h) determining a second relationship for each of the plurality of grid points; (i) comparing the first and second relationships; and (j) determining a location of the mobile device as a function of the comparison of the first and second relationships; wherein the step of determining a first relationship further comprises determining a ratio of the determined first range of the mobile device with a weighted metric of the determined first range for each of the plurality of grid points. - View Dependent Claims (14)
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15. A method of estimating the location of a mobile device comprising the steps of:
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(a) determining a range of a mobile device to a reference station as a function of the time of transmission of a first signal transmitted from a base station and as a function of the time of receipt of a second signal transmitted from the mobile device to the reference station, the second signal being a function of the first signal advanced by a timing parameter; (b) providing a plurality of grid points in a geographic region, the plurality of grid points containing the reference station; (c) determining a relationship for each of the plurality of grid points as a function of the determined range and a range metric; (d) comparing the determined relationship with data corresponding to each of the plural grid points; and (e) determining a location of the mobile device as a function of the comparison. - View Dependent Claims (16, 17, 18, 19)
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20. A system for estimating the location of a mobile device comprising:
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(a) circuitry for determining a range of a mobile device to a reference station as a function of the time of transmission of a first signal transmitted from a base station and as a function of the time of receipt of a second signal transmitted from the mobile device to the reference station, the second signal being a function of the first signal advanced by a timing parameter; (b) a processor for determining a plurality of grid points in a geographic region, the plurality of grid points containing the geographic location of the reference station; (c) circuitry for determining a relationship for each of the plurality of grid points as a function of the determined range and a range metric; (d) circuitry for comparing the determined relationship with data corresponding to each of the plural grid points; and (e) circuitry for determining a location of the mobile device as a function of the comparison.
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21. In a method for estimating the location of a mobile device in a geographic region, the method including determining a range of a mobile device to a reference station as a function of the time of transmission of a first signal transmitted from a base station and received by the mobile device and as a function of a second signal transmitted from the mobile device to a reference station, the second signal being a function of the first signal advanced by a timing parameter, the improvement comprising:
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defining the geographic region by a plurality of grid points; determining a relationship for each of the plurality of grid points as a function of the determined range and a range metric; comparing the determined relationship with data corresponding to each of the plurality of grid points to determine a location of the mobile device; and determining a location of the mobile device as a function of the comparison. - View Dependent Claims (22)
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Specification