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

Full Title

Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic or electromagnetic waves, or particle emission, not having a directional significance, are being received (position-fixing by co-ordinating a plurality of determinations of direction or position lines G01S5/00) > using radio waves > 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

Child Classifications

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• G01S 3/18 derived directly from separate directional antennas
• G01S 3/20 derived by sampling signal received by an antenna system having periodically-varied orientation of directivity characteristic
• G01S 3/22 derived from different combinations of signals from separate antennas, e.g. comparing sum with difference