Positioning technique for wireless communication system
First Claim
1. A method performed by a wireless network device of a communication network, the method comprising:
- determining distances between the wireless network device and a plurality of reference wireless network devices;
determining an initial position of the wireless network device based, at least in part, on known positions of at least a subset of the plurality of reference wireless network devices;
determining, by executing a first set of positioning computations associated with time difference of arrival (TDOA), an intermediate position of the wireless network device and distance calibration values associated with the plurality of reference wireless network devices based, at least in part, on the initial position of the wireless network device and the distances between the wireless network device and the plurality of reference wireless network devices; and
estimating, by executing a second set of positioning computations associated with time of arrival (TOA), a current position of the wireless network device based, at least in part, on the intermediate position of the wireless network device and the distance calibration values associated with the plurality of reference wireless network devices.
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Accused Products
Abstract
A hybrid positioning system can be implemented to improve location estimation of a wireless network device when reference network devices can have different distance calibration constants. For each of a plurality of positions at which the wireless network device is placed and for each reference network device, a distance between the wireless network device and the reference network device is determined. A first positioning algorithm is executed to determine an intermediate location (corresponding to each position) of the wireless network device and a distance calibration constant for each reference network device based, in part, on a corresponding initial location of the wireless network device. A second positioning algorithm is executed to estimate a subset of the positions of the wireless network device based on the intermediate location (corresponding to the position) of the wireless network device and the distance calibration constant of each of reference network devices.
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Citations
22 Claims
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1. A method performed by a wireless network device of a communication network, the method comprising:
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determining distances between the wireless network device and a plurality of reference wireless network devices; determining an initial position of the wireless network device based, at least in part, on known positions of at least a subset of the plurality of reference wireless network devices; determining, by executing a first set of positioning computations associated with time difference of arrival (TDOA), an intermediate position of the wireless network device and distance calibration values associated with the plurality of reference wireless network devices based, at least in part, on the initial position of the wireless network device and the distances between the wireless network device and the plurality of reference wireless network devices; and estimating, by executing a second set of positioning computations associated with time of arrival (TOA), a current position of the wireless network device based, at least in part, on the intermediate position of the wireless network device and the distance calibration values associated with the plurality of reference wireless network devices. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A wireless network device for use in a communication network, the wireless network device comprising:
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a network interface operable to couple the wireless network device to the communication network; and a position determination unit coupled with the network interface, the position determination unit operable to; determine distances between the wireless network device and a plurality of reference wireless network devices; determine an initial position of the wireless network device based, at least in part, on known positions of at least a subset of the plurality of reference wireless network devices; determine, by executing a first set of positioning computations associated with time difference of arrival (TDOA), an intermediate position of the wireless network device and distance calibration values associated with the plurality of reference wireless network devices based, at least in part, on the initial position of the wireless network device and the distances between the wireless network device and the plurality of reference wireless network devices; and estimate, by executing a second set of positioning computations associated with time of arrival (TOA), a current position of the wireless network device based, at least in part, on the intermediate position of the wireless network device and the distance calibration values associated with the plurality of reference wireless network devices. - View Dependent Claims (16, 17, 18, 19)
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20. A non-transitory machine-readable media having instructions stored therein, which when executed by one or more processors of a wireless network device causes the wireless network device to perform operations that comprise:
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determining distances between the wireless network device and a plurality of reference wireless network devices; determining an initial position of the wireless network device based, at least in part, on known positions of at least a subset of the plurality of reference wireless network devices; determining, by executing a first set of positioning computations associated with time difference of arrival (TDOA), an intermediate position of the wireless network device and distance calibration values associated with the plurality of reference wireless network devices based, at least in part, on the initial position of the wireless network device and the distances between the wireless network device and the plurality of reference wireless network devices; and estimating, by executing a second set of positioning computations associated with time of arrival (TOA), a current position of the wireless network device based, at least in part, on the intermediate position of the wireless network device and the distance calibration values associated with the plurality of reference wireless network devices. - View Dependent Claims (21, 22)
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Specification