Estimation of speed and direction of travel in a WLAN positioning system
AssigneeSkyhook Wireless, Inc.
InventorsFarshid Alizadeh-Shabdiz, Edward J. Morgan, Kaveh Pahlavan
Life of this patent
Estimating the term…
Abstract
A method for estimating the speed and bearing of a Wi-Fi enabled device using WLAN radio signals in a WLAN based location service is provided. A method used to estimate a speed of travel of a Wi-Fi enabled device comprises the Wi-Fi enabled device receiving signals transmitted by Wi-Fi access points in range of the Wi-Fi enabled device, and using the signals to estimate the speed of and/or direction of travel of the Wi-Fi enabled device.
Claims13
A method used to estimate a speed of travel of a Wi-Fi enabled device without requiring position estimates of the Wi-Fi enabled device, comprising:
- the Wi-Fi enabled device receiving signals transmitted by a plurality of Wi-Fi access points in range of the Wi-Fi enabled device, the receiving occurring over time;
- the Wi-Fi enabled device measuring an individual amount of time during which the Wi-Fi enabled device continually detects signals transmitted by a corresponding individual Wi-Fi access point of the plurality of Wi-Fi access points;
- calculating an average amount of time during which signals transmitted by the individual Wi-Fi access points are detected based on the individual amounts of time signals from the corresponding individual Wi-Fi access points are detected;
- and
- estimating the speed of travel of the Wi-Fi enabled device using the average amount of time signals are detected, so that the speed of travel can be estimated without requiring position estimates of the Wi-Fi enabled device.
In a location-based services system having a plurality of Wi-Fi access points in a target area, the Wi-Fi access points being positioned at geographic locations, a method for generating a speed of travel of a Wi-Fi enabled device by combining a plurality of speed estimation techniques using received Wi-Fi signals, said method comprising:
- the Wi-Fi enabled device receiving signals transmitted by said Wi-Fi access points;
- using said received signals to provide a first estimated speed of travel using a first estimation technique;
- using said received signals to provide a second estimated speed of travel using a second estimation technique;
- using said received signals to provide a third estimated speed of travel using a third estimation technique;
- and
- using the first, second, and third estimated speeds of travel to generate a fourth speed of travel;
- wherein said first, second, and third estimation techniques are different techniques to estimate speed of travel.
Dependencies are inferred from the claim text.