In a positioning system () for estimating the position of a mobile device (), a processing system () receives external-range data, representative of a range between the mobile device and an external unit (), and acceleration data representative of acceleration of the mobile device due to its…
A method for finding door location in an automated way based on observations of people that are equipped with a device whose position is determined acoustically. By observing positioning transitions across internal structures such as walls, the location of doors can be automatically identified.