Abstract: A system and method for transmitting information in which a relatively narrowband signal is transmitted followed by the transmission of a relatively wideband signal. The narrowband signal may be used by the receiver to alert the receiver to the upcoming wideband signal. In a system in which the transmissions occur asynchronously to the receiver, the receiver may be less complicated because the receiver is provided with an indication of the time and/or the center frequency of the wideband signal. Either the narrowband signal or the wideband signal may be used to transmit information from the transmitting device to the receiver. The system and method find particular advantage in tracking and locating systems in which a plurality of tags asynchronously transmit information and/or location information to a receiver or a set of receivers.

Abstract: A system and method for tracking a remote RF transmitter with reduced susceptibility to the effects of multipath in which the distance and direction of an arriving RF chirp signal are determined with respect to the earliest arriving portion of the signal which is presumed to be the direct path signal. The received chirp signals, including the direct and multipath signals, from a remote transmitter are correlated into plural path signals, and the direction and distance to the transmitter is determined from the earliest arriving path signal.