Patent ID: 8058992
Filing Date: 2011-11-15
Classification: G01S

Abstract:
1. A method for sensorless tracking of an indoor target using a wireless distance measuring technology, said method comprising: initially moving a location tracking apparatus; determining whether an initial traveling direction of the location tracking apparatus is forward or backward with respect to a target, wherein said initial travel direction is determined according to change in a distance measurement between the location tracking apparatus and the target; determining a minimum distance and corresponding location between the location tracking apparatus and the target as movement proceeds along the initial travel direction; storing the minimum distance and corresponding location; moving a predetermined distance past the location corresponding to the minimum distance; making one of a P-turn and three 90-degree turns to move the location tracking apparatus to the location corresponding to the minimum distance; determining whether the location tracking apparatus is directed forward or backward with respect to the target at the location corresponding to the minimum distance; and adjusting the direction of travel to cause the location tracking apparatus to move toward the target.