Hybrid time of arrival based positioning system
First Claim
1. A method comprising:
- determining, at a wireless network device of a communication network, a round trip transit time between the wireless network device and each of a plurality of reference wireless network devices of the communication network;
for each of the plurality of reference wireless network devices, determining a distance between the wireless network device and the reference wireless network device based, at least in part, on the round trip transit time between the wireless network device and the reference wireless network device;
determining an initial location of the wireless network device based, at least in part, on a known location of each of the plurality of reference wireless network devices;
determining a first intermediate location of the wireless network device and an intermediate distance calibration constant based, at least in part, on the initial location of the wireless network device and the distance between the wireless network device and each of the plurality of reference wireless network devices;
determining a second intermediate location of the wireless network device based on at least one of the known location of each of the plurality of reference wireless network devices and the first intermediate location of the wireless network device;
determining a target distance calibration constant associated with the plurality of reference wireless network devices based on at least one of the first intermediate location of the wireless network device, the intermediate distance calibration constant, and the distance between the wireless network device and the plurality of reference wireless network devices; and
iteratively estimating a current location of the wireless network device based, at least in part, on the second intermediate location of the wireless network device and the target distance calibration constant.
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Accused Products
Abstract
A hybrid TOA positioning system can be implemented to improve location estimation of a wireless network device. An initial location of the wireless network device can be calculated based on locations of a plurality of reference network devices. A first intermediate location of the wireless network device and an intermediate distance calibration constant can be determined based, at least in part, on the initial location of the wireless network device and distance between the wireless network device and each of the reference network devices. A second intermediate location of the wireless network device and a target distance calibration constant can be calculated based on the locations of the reference network devices, the first intermediate location, and/or the intermediate distance calibration constant. The location of the wireless network device can be iteratively estimated based, at least in part, on the second intermediate location and the target distance calibration constant.
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Citations
25 Claims
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1. A method comprising:
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determining, at a wireless network device of a communication network, a round trip transit time between the wireless network device and each of a plurality of reference wireless network devices of the communication network; for each of the plurality of reference wireless network devices, determining a distance between the wireless network device and the reference wireless network device based, at least in part, on the round trip transit time between the wireless network device and the reference wireless network device; determining an initial location of the wireless network device based, at least in part, on a known location of each of the plurality of reference wireless network devices; determining a first intermediate location of the wireless network device and an intermediate distance calibration constant based, at least in part, on the initial location of the wireless network device and the distance between the wireless network device and each of the plurality of reference wireless network devices; determining a second intermediate location of the wireless network device based on at least one of the known location of each of the plurality of reference wireless network devices and the first intermediate location of the wireless network device; determining a target distance calibration constant associated with the plurality of reference wireless network devices based on at least one of the first intermediate location of the wireless network device, the intermediate distance calibration constant, and the distance between the wireless network device and the plurality of reference wireless network devices; and iteratively estimating a current location of the wireless network device based, at least in part, on the second intermediate location of the wireless network device and the target distance calibration constant. - 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 comprising:
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a network interface; and a location calculation unit coupled with the network interface, the location calculation unit operable to; determine a round trip transit time between the wireless network device and each of a plurality of reference wireless network devices of a communication network; for each of the plurality of reference wireless network devices, determine a distance between the wireless network device and the reference wireless network device based, at least in part, on the round trip transit time between the wireless network device and the reference wireless network device; determine an initial location of the wireless network device based, at least in part, on a known location of each of the plurality of reference wireless network devices; determine a first intermediate location of the wireless network device and an intermediate distance calibration constant based, at least in part, on the initial location of the wireless network device and the distance between the wireless network device and each of the plurality of reference wireless network devices; determine a second intermediate location of the wireless network device based on at least one of the known location of each of the plurality of reference wireless network devices and the first intermediate location of the wireless network device; determine a target distance calibration constant associated with the plurality of reference wireless network devices based on at least one of the first intermediate location of the wireless network device, the intermediate distance calibration constant, and the distance between the wireless network device and the plurality of reference wireless network devices; and iteratively estimate a current location of the wireless network device based, at least in part, on the second intermediate location of the wireless network device and the target distance calibration constant. - View Dependent Claims (16, 17, 18, 19, 20)
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21. One or more non-transitory machine-readable storage media having instructions stored therein, which when executed by one or more processors causes the one or more processors to perform operations that comprise:
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determining, at a wireless network device of a communication network, a round trip transit time between the wireless network device and each of a plurality of reference wireless network devices of the communication network; for each of the plurality of reference wireless network devices, determining a distance between the wireless network device and the reference wireless network device based, at least in part, on the round trip transit time between the wireless network device and the reference wireless network device; determining an initial location of the wireless network device based, at least in part, on a known location of each of the plurality of reference wireless network devices; determining a first intermediate location of the wireless network device and an intermediate distance calibration constant based, at least in part, on the initial location of the wireless network device and the distance between the wireless network device and each of the plurality of reference wireless network devices; determining a second intermediate location of the wireless network device based on at least one of the known location of each of the plurality of reference wireless network devices and the first intermediate location of the wireless network device; determining a target distance calibration constant associated with the plurality of reference wireless network devices based on at least one of the first intermediate location of the wireless network device, the intermediate distance calibration constant, and the distance between the wireless network device and the plurality of reference wireless network devices; and iteratively estimating a current location of the wireless network device based, at least in part, on the second intermediate location of the wireless network device and the target distance calibration constant. - View Dependent Claims (22, 23, 24, 25)
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Specification