Method and apparatus for calculating a representative measurement from multiple data measurements
First Claim
1. A method for calculating a representative measurement from a plurality of substantially independent data measurements from a cellular base station, each of said data measurements including an earliest time of arrival estimate, comprising:
- determining a window of time;
selecting data measurements within said window; and
calculating a representative time of arrival responsive to said selected data measurements.
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Abstract
A method and apparatus for calculating a representative measurement from multiple data measurements of signals from cellular base stations, thereby facilitating utilization of a cellular network to determine position of a mobile station even in non-line of sight and/or dynamic fading environments. A method for calculating a representative measurement includes determining a window of time, selecting data measurements within the window, and calculating a representative time of arrival responsive thereto, such as averaging all data measurements within the window. A representative RMSE estimate may be calculated. To determine a window of time all data measurements within a predetermined window from an earliest time of arrival may be selected. Alternatively the window may be determined by sliding over the data measurements. The data measurements may be stored in a database in a mobile station, and the database is updated to include each new measurement.
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Citations
46 Claims
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1. A method for calculating a representative measurement from a plurality of substantially independent data measurements from a cellular base station, each of said data measurements including an earliest time of arrival estimate, comprising:
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determining a window of time;
selecting data measurements within said window; and
calculating a representative time of arrival responsive to said selected data measurements. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for calculating a representative measurement from a plurality of substantially independent data measurements from a cellular base station, each of said data measurements including an earliest time of arrival estimate, comprising:
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determining a window of time, including identifying an earliest data measurement of said time of arrival estimates, and applying a predetermined time following said earliest data measurement to provide said window;
selecting all data measurements within said window;
calculating a representative time of arrival responsive to said selected data measurements including averaging the time of arrival estimates that fall within said window. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A method for determining the position of a mobile station using a plurality of cellular base stations each emitting a unique pilot signal, comprising:
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taking a plurality of substantially independent data measurements of the pilot signals from each of said plurality of cellular base stations, each of said data measurements including an earliest time of arrival estimate for each pilot signal, thereby providing a plurality of independent measurements of the earliest time of arrival for each of the pilot signals from said plurality of cellular base stations;
for each cellular base station, calculating a representative measurement of the earliest time of arrival responsive to said independent measurements for said cellular base station, including determining a window of time;
selecting data measurements within said window;
calculating a representative time of arrival responsive to said selected data measurements; and
utilizing at least one of said representative measurements to determine the position of said mobile station. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. A system for determining the position of a mobile station using a plurality of cellular base stations each emitting a unique pilot signal, comprising:
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data taking means for taking a plurality of substantially independent data measurements of the pilot signals from each of said plurality of cellular base stations, each of said data measurements including an earliest time of arrival estimate for each pilot signal, thereby providing a plurality of independent measurements of the earliest time of arrival for each of the pilot signals from said plurality of cellular base stations;
database updating means for updating the database following taking of each data measurement;
representative measurement calculation means for calculating a representative measurement for each cellular base station, including means for calculating the earliest time of arrival responsive to said independent measurements for each respective cellular base station; and
positioning means, responsive to at least one of said representative measurements, for determining the position of said mobile station. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
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Specification