Estimation of speed and direction of travel in a WLAN positioning system
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.
1. A method of inferring that a Wi-Fi enabled device is substantially stationary, comprising:
receiving information from signals transmitted by at least one Wi-Fi access point and received by a Wi-Fi enabled device, the receiving occurring over time;
measuring, over an interval of time, a total duration of time during which the Wi-Fi enabled device detects signals transmitted by the at least one Wi-Fi access point; and
inferring that the Wi-Fi enabled device is substantially stationary based on the total duration of time during which signals from the at least one Wi-Fi access point were detected so that the inference that the Wi-Fi enabled device is substantially stationary can be made without requiring position estimates of the Wi-Fi enabled device.
2. A system for inferring that a Wi-Fi enabled device is substantially stationary, comprising:
at least one non-transitory computer-readable media comprising instructions that when executed cause a computer system to:
receive information from signals transmitted by at least one Wi-Fi access point and received by a Wi-Fi enabled device, the receiving occurring over time;
measure, over an interval of time, a total duration of time during which the Wi-Fi enabled device detects signals transmitted by the at least one Wi-Fi access point; and infer that the Wi-Fi enabled device is substantially stationary based on the total duration of time during which signals from the at least one Wi-Fi access point were detected so that the inference that the Wi-Fi enabled device is substantially stationary can be made without requiring position estimates of the Wi-Fi enabled device.