A broadband transmitter element, located at a remote object, transmits a broadband signal at a prescribed transmission time. A broadband receiver element, located at a base platform spaced from the remote object, receives electromagnetic radiation during a reception search window. The broadband receiver...http://www.google.de/patents/US5920278?utm_source=gb-gplus-sharePatent US5920278 - Method and apparatus for identifying, locating, tracking, or communicating with remote objects
