CPC Subgroup
G01S 3/8034 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 ultrasonic, sonic or infrasonic waves > Systems for determining direction or deviation from predetermined direction > using amplitude comparison of signals derived from receiving transducers or transducer systems having differently-oriented directivity characteristics
2 direct subcodes
Child Classifications
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