Position determination system that uses A cellular communication system
First Claim
1. A method for determining a position of a mobile station using at least one cellular base station emitting a pilot signal, the method comprising:
- taking first data measurements for resolvable signal paths for a pilot signal from a first base station, the first data measurements including a first earliest time of arrival estimate for the resolvable signal paths and a first time of measurement;
taking second data measurements for resolvable signal paths of the pilot signal, the second data measurements substantially statistically independent of the first data measurements, and the second data measurements including a second earliest time of arrival estimate and a second time of measurement;
determining representative data measurements for the first base station based on the first data measurements and the second data measurements, including decreasing weightings of the first and second earliest time of arrival estimates dependent upon the first and second times of measurement; and
determining the position of the mobile station based in part on the representative data measurement.
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Accused Products
Abstract
A position determination system and apparatus for utilizing a network of cellular base stations to determine position of a mobile station includes taking a plurality of statistically independent data measurements of the pilot signals from the base stations. Each of the data measurements includes an earliest time of arrival, providing multiple independent measurements for each of the pilot signals. For each cellular base station, a representative measurement is calculated responsive to the independent measurements, which is used to determine position of the mobile station using an AFLT algorithm and/or in conjunction with a GPS algorithm. In some embodiments, the data measurements for each pilot signal further include an RMSE estimate and time of measurement for each time of arrival, and an energy measurement for all resolvable paths. If the mobile station comprises a cell phone, a cell search list and a GPS search list may be provided by a cell base station.
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Citations
21 Claims
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1. A method for determining a position of a mobile station using at least one cellular base station emitting a pilot signal, the method comprising:
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taking first data measurements for resolvable signal paths for a pilot signal from a first base station, the first data measurements including a first earliest time of arrival estimate for the resolvable signal paths and a first time of measurement; taking second data measurements for resolvable signal paths of the pilot signal, the second data measurements substantially statistically independent of the first data measurements, and the second data measurements including a second earliest time of arrival estimate and a second time of measurement; determining representative data measurements for the first base station based on the first data measurements and the second data measurements, including decreasing weightings of the first and second earliest time of arrival estimates dependent upon the first and second times of measurement; and determining the position of the mobile station based in part on the representative data measurement. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A mobile station that utilizes a cellular network that includes a plurality of cellular base stations each emitting a unique pilot signal, the mobile station comprising:
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a cellular communication system for communicating with said cellular base stations and for receiving pilot signals from each of the plurality of cellular base stations; a database that stores a plurality of data measurements based on resolvable pilot signals received from a first of the plurality of cellular base stations and a plurality of data measurements based on resolvable pilot signals received from a second of the plurality of cellular base stations, each of the data measurements including data substantially statistically independent of other data measurements for a respective base station, wherein each of the data measurements includes an earliest time of arrival estimate for resolvable pilot signals and a time of measurement; a representative measurement calculation system configured to receive the data measurements from said database, and responsive thereto to provide a representative measurement of the time of arrival for each pilot signal, wherein the representative measurement calculation system is configured to decrease weightings of the earliest time of arrival estimates of the data measurements dependent upon the times of measurement; and a position calculation and control system configured to receive said representative measurements for each pilot signal and responsive thereto, to determine the position of the mobile station. - View Dependent Claims (18, 19, 20)
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21. A mobile station that utilizes a cellular network that includes a plurality of cellular base stations each emitting a unique pilot signal, the mobile station comprising:
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means for taking first data measurements for resolvable signal paths for a pilot signal from a first base station, the first data measurements including a first earliest time of arrival estimate for the resolvable signal paths and a first time of measurement; means for taking second data measurements for resolvable signal paths of the pilot signal the second data measurements substantially statistically independent of the first data measurements, and the second data measurements including a second earliest time of arrival estimate and a second time of measurement; means for determining representative data measurements for the first base station based on the first data measurements and the second data measurements, including means for decreasing weightings of the first and second earliest time of arrival estimates dependent upon the first and second times of measurement; and means for determining the position of the mobile station based in part on the representative data measurement.
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Specification