Method and apparatus for improving radio location accuracy with measurements
First Claim
1. A method of determining a position estimate for a wireless terminal, comprising:
- obtaining an initial position estimate for the terminal using a first position determination scheme based at least in part on one or more signals from a first wireless communication system;
obtaining a set of one or more measurements using at least one additional position determination scheme based on at least one signal from at least one additional wireless communication system that is distinct from the first wireless communication system; and
updating the initial position estimate based on the set of one or more measurements,wherein the set of one or more measurements is a partial set of one or more measurements that is insufficient to independently derive the position estimate for the terminal with a threshold level of accuracy using the at least one additional determination scheme, orwherein the set of one or more measurements is a complete set of one or more measurements that is sufficient to independently derive the position estimate for the terminal with the threshold level of accuracy using the at least one additional determination scheme.
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Accused Products
Abstract
A method and apparatus to utilize a set of measurements (either partial or compete) to improve the accuracy of an initial position estimate for a wireless terminal. The initial position estimate for the terminal is first obtained (e.g., based on a cell-ID or an enhanced cell-ID solution). Measurements are obtained for the terminal. The initial position estimate is then updated with the measurements to obtain a revised position estimate for the terminal. The updating may be performed by (1) deriving a measurement vector based on the initial position estimate and the measurements, (2) forming an observation matrix for the measurements, (3) determining a matrix of weights, (4) deriving a correction vector based on the measurement vector, the observation matrix, and the weight matrix, and (5) updating the initial position estimate with the correction vector.
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Citations
42 Claims
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1. A method of determining a position estimate for a wireless terminal, comprising:
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obtaining an initial position estimate for the terminal using a first position determination scheme based at least in part on one or more signals from a first wireless communication system; obtaining a set of one or more measurements using at least one additional position determination scheme based on at least one signal from at least one additional wireless communication system that is distinct from the first wireless communication system; and updating the initial position estimate based on the set of one or more measurements, wherein the set of one or more measurements is a partial set of one or more measurements that is insufficient to independently derive the position estimate for the terminal with a threshold level of accuracy using the at least one additional determination scheme, or wherein the set of one or more measurements is a complete set of one or more measurements that is sufficient to independently derive the position estimate for the terminal with the threshold level of accuracy using the at least one additional determination scheme. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. An apparatus configured to determine a position estimate for a wireless terminal, comprising:
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means for obtaining an initial position estimate for the terminal using a first position determination scheme based at least in part on one or more signals from a first wireless communication system; means for obtaining a set of one or more measurements using at least one additional position determination scheme based on at least one signal from at least one additional wireless communication system that is distinct from the first wireless communication system; and means for updating the initial position estimate based on the set of one or more measurements, wherein the set of one or more measurements is a partial set of one or more measurements that is insufficient to independently derive the position estimate for the terminal with a threshold level of accuracy using the at least one additional determination scheme, or wherein the set of one or more measurements is a complete set of one or more measurements that is sufficient to independently derive the position estimate for the terminal with the threshold level of accuracy using the at least one additional determination scheme. - View Dependent Claims (35, 36)
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37. An apparatus configured to determine a position estimate for a wireless terminal, comprising:
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a processor configured to obtain an initial position estimate for the terminal using a first position determination scheme based at least in part on one or more signals from a first wireless communication system, to obtain a set of one or more measurements using at least one additional position determination scheme based on at least one signal from at least one additional wireless communication system that is distinct from the first wireless communication system and to update the initial position estimate based on the set of one or more measurements, wherein the set of one or more measurements is a partial set of one or more measurements that is insufficient to independently derive the position estimate for the terminal with a threshold level of accuracy using the at least one additional determination scheme, or wherein the set of one or more measurements is a complete set of one or more measurements that is sufficient to independently derive the position estimate for the terminal with the threshold level of accuracy using the at least one additional determination scheme. - View Dependent Claims (38, 39)
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40. A non-transitory computer-readable medium containing instructions stored thereon, which, when executed by an apparatus configured to determine a position estimate for a wireless terminal, cause the apparatus to perform operations, the instructions comprising:
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at least one instruction configured to cause the apparatus to obtain an initial position estimate for the terminal using a first position determination scheme based at least in part on one or more signals from a first wireless communication system; at least one instruction configured to cause the apparatus to obtain a set of one or more measurements using at least one additional position determination scheme based on at least one signal from at least one additional wireless communication system that is distinct from the first wireless communication system; and at least one instruction configured to cause the apparatus to update the initial position estimate based on the set of one or more measurements, wherein the set of one or more measurements is a partial set of one or more measurements that is insufficient to independently derive the position estimate for the terminal with a threshold level of accuracy using the at least one additional determination scheme, or wherein the set of one or more measurements is a complete set of one or more measurements that is sufficient to independently derive the position estimate for the terminal with the threshold level of accuracy using the at least one additional determination scheme. - View Dependent Claims (41, 42)
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Specification