Systems for determining direction or position line

Full Title

Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith (position fixing by co-ordinating a plurality of determinations of direction or position lines G01S5/00) > using ultrasonic, sonic or infrasonic waves > Systems for determining direction or position line

Child Classifications

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• G01S 1/763
• G01S 1/766
• G01S 1/78 using amplitude comparison of signals transmitted from transducers or transducer systems having differently-oriented characteristics
• G01S 1/80 using a comparison of transit time of synchronised signals transmitted from non-directional transducers or transducer systems spaced apart, i.e. path-difference systems
• G01S 1/82 Rotating or oscillating beam beacons defining directions in the plane of rotation or oscillation