ESTIMATION OF POSITION, SPEED AND BEARING USING TIME DIFFERENCE OF ARRIVAL AND RECEIVED SIGNAL STRENGTH IN A WLAN POSITIONING SYSTEM
First Claim
1. A method of estimating a speed of travel of a WLAN-enabled device, the method comprising:
- the WLAN-enabled device receiving signals transmitted by a WLAN access point in range of the WLAN-enabled device, the signals including a first message and a second message;
estimating an expected time of arrival of the second message based on an actual arrival time of the first message;
determining an actual time of arrival value of the second message;
determining a time difference of arrival value for the second message based on the actual time of arrival of the second message and the expected time of arrival of the second message; and
estimating the speed of travel of the WLAN-enabled device based on the time difference of arrival value.
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Abstract
A method of estimating the speed of a WLAN-enabled device in a WLAN positioning system is provided. A method of estimating a speed of travel of a WLAN-enabled device includes the WLAN-enabled device receiving signals transmitted by a WLAN access point in range of the WLAN-enabled device. The signals include a first message and a second message. The method also includes estimating an expected time of arrival of the second message based on an actual arrival time of the first message and determining an actual time of arrival value of the second message. The method further includes determining a time difference of arrival value for the second message based on the actual time of arrival of the second message and the expected time of arrival of the second message and estimating the speed of travel of the WLAN-enabled device based on the time difference of arrival value.
188 Citations
18 Claims
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1. A method of estimating a speed of travel of a WLAN-enabled device, the method comprising:
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the WLAN-enabled device receiving signals transmitted by a WLAN access point in range of the WLAN-enabled device, the signals including a first message and a second message; estimating an expected time of arrival of the second message based on an actual arrival time of the first message; determining an actual time of arrival value of the second message; determining a time difference of arrival value for the second message based on the actual time of arrival of the second message and the expected time of arrival of the second message; and estimating the speed of travel of the WLAN-enabled device based on the time difference of arrival value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification