Patent ID: 6845240
Filing Date: 2005-01-18
Classification: G01S,H04B

Abstract:
1. A method for geolocating a mobile appliance transmitting an FM analog signal which can be received by a plurality of wireless location sensors each including at least one antenna, comprising the steps of: (a) sending a first geolocation reference signal from each of a plurality of wireless location sensors to a central node, comprising the steps of: (b) determining at the central node a primary wireless location sensor including the steps of: (c) receiving a second FM analog signal at each of the plurality of wireless location sensors, comprising the steps of: (d) sending a reference signal from the primary wireless location sensor to the central node, comprising the steps of: (e) sending the reference signal from the central node to each one of the plurality of wireless location sensors in response to receipt at the central node of the reference signal from the primary wireless location sensor; (f) sending a geolocation time of arrival signal from each of the plurality of wireless location sensors to a central node, comprising the steps of: (g) receiving the geolocation time of arrival signals from the plurality of wireless location sensors; (h) determining the geolocation of the mobile appliance at the central node from the geolocation time of arrival signals.