The present invention relates to systems and methods to locate and recover objects equipped with tracking devices by determining the location information of the object. The system employs multiple radio direction finding (RDF) devices, which is capable of determining the angle of arrival of a radio signal....http://www.google.es/patents/US20050130670?utm_source=gb-gplus-sharePatente US20050130670 - Systems and methods for distributed processing of location information associated with emergency 911 wireless transmissions
Systems and methods for distributed processing of location information ...
