using radio waves

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

Child Classifications

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• G01S 3/023
• G01S 3/04 Details
• G01S 3/14 Systems for determining direction or deviation from predetermined direction
• G01S 3/72 Diversity systems specially adapted for direction-finding
• G01S 3/74 Multi-channel systems specially adapted for direction-finding, i.e. having a single antenna system capable of giving simultaneous indications of the directions of different signals (systems in which the directions of different signals are determined sequentially and displayed simultaneously G01S3/04, G01S3/14)