Patent ID: 7379015

Claim:
An apparatus for determining location of a personnel badge, comprising: a personnel badge having a ranging transponder for responding automatically to base ranging signals with respective return ranging signals; a primary enabler having a first location, the primary enabler having a first two-way ranger radio for measuring a first round trip time between transmitting a first of said base ranging signals and receiving a first of said return ranging signals; at least one secondary enabler having a corresponding second location, the secondary enabler having a second two-way ranger radio for determining a second round trip time between transmitting a second of said base ranging signals and receiving a second of said return ranging signals; a badge locator constructed for determining a location of the badge from positioning information derived from said first and second locations and said first and second round trip times; and wherein: the primary enabler includes a stationary detector configured to provide a stationary override to cause certain new position information to be ignored for determination of said first location when said stationary detector detects the primary enabler is stationary.