Abstract

A communication device (1) operable to communicate with another communication device (3) to determine the location of the two devices with respect to one another, the communication device having a plurality of antennas (5, 7, 9) and being configured to transmit an interrogation radio wave signal (11) to the other communication device from at least one of the antennas, the communication device being configured to detect at each one of the antennas a radio wave reply signal sent from the other communication device in response to the interrogation signal; the communication device including a processing module for processing the reply signal received at each antenna, the processing module being configured to determine a direction in which the other communication device is located based on characteristics of the reply signal as received at each antenna.

IPC Classes  ?

• G01S 3/16 - Systems for determining direction or deviation from predetermined direction using amplitude comparison of signals derived sequentially from receiving antennas or antenna systems having differently-oriented directivity characteristics or from an antenna system having periodically-varied orientation of directivity characteristic
• G01S 3/18 - Systems for determining direction or deviation from predetermined direction using amplitude comparison of signals derived sequentially from receiving antennas or antenna systems having differently-oriented directivity characteristics or from an antenna system having periodically-varied orientation of directivity characteristic derived directly from separate directional antennas
• G01S 5/00 - Position-fixing by co-ordinating two or more direction or position-line determinationsPosition-fixing by co-ordinating two or more distance determinations