SPEED ESTIMATION USING DELTA RTT MEASUREMENTS AND AREA MAPS
First Claim
1. A method of two-dimensional (2D) velocity estimation of an object located in a first area, the method comprising:
- determining round trip times (RTTs) of signals from two or more signal sources to the object;
determining delta RTT values of the signals subsequent to relocation of the object within the first area, based at least in part on the determined RTTs;
determining angles of arrival (AOAs) of the signals at the object; and
calculating a 2D velocity estimate based on the delta RTT values and the AOAs.
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Accused Products
Abstract
Systems and methods for two-dimensional (2D) velocity estimation of an object in an area of interest are disclosed. The area of interest can correspond to an indoor or an outdoor environment. Round trip times (RTTs) of signals from two or more signal sources to the object are determined. The object is relocated and delta RTT values of the signals subsequent to relocation of the object within the area of interest are determined. Angles of arrival (AOAs) of the signals at the object also determined. The 2D velocity of the object is estimated by on solving a system of non-linear equations based on the delta RTT values and the AOAs.
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Citations
30 Claims
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1. A method of two-dimensional (2D) velocity estimation of an object located in a first area, the method comprising:
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determining round trip times (RTTs) of signals from two or more signal sources to the object; determining delta RTT values of the signals subsequent to relocation of the object within the first area, based at least in part on the determined RTTs; determining angles of arrival (AOAs) of the signals at the object; and calculating a 2D velocity estimate based on the delta RTT values and the AOAs. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus comprising:
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a receiver configured to receive signals; logic to determine round trip times (RTTs) of signals to an object located in a first area from two or more signal sources; logic to determine delta RTT values of the signals to the object based at least in part on a relocation of the object within the first area and the determined RTTs; logic to determine angles of arrival (AOAs) of the signals at the object; and logic to calculate a 2D velocity estimate of the object based on the delta RTT values and the AOAs. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A system comprising:
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means for determining round trip times (RTTs) of signals from two or more signal sources to an object located in a first area; means for determining delta RTT values of the signals subsequent to relocation of the object within the first area, based at least in part on the determined RTTs; means for determining angles of arrival (AOAs) of the signals at the object; and means for calculating a 2D velocity estimate of the object based on the delta RTT values and the AOAs. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28)
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29. A non-transitory computer-readable storage medium comprising code, which, when executed by a processor, causes the processor to perform operations for estimating two-dimensional (2D) velocity of an object located in a first area, the non-transitory computer-readable storage medium comprising:
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code for determining round trip times (RTTs) of signals from two or more signal sources to the object; code for determining delta RTT values of the signals subsequent to relocation of the object within the first area, based at least in part on the determined RTTs; code for determining angles of arrival (AOAs) of the signals at the object; and code for calculating a 2D velocity estimate based on the delta RTT values and the AOAs.
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30. A method for speed estimation comprising:
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determining at least two linearly-independent one dimensional (1D) speed measurements based on signals from a plurality of access points (APs); measuring angles of arrival (AOAs) for each of the signals; and calculating a two dimensional (2D) velocity estimate using the at least two linearly-independent 1D speed measurements and the AOAs for each of the signals.
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Specification