Systems for determining direction or deviation from predetermined direction

Introduced: January 1990

Full Title

Full titles differ between systems:

IPC:

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 > using ultrasonic, sonic or infrasonic waves > Systems for determining direction or deviation from predetermined direction

CPC:

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

Of 7 combined children, 4 exist in both systems.

3 codes are CPC-only extensions.

IPC defines codes here since 1990.

Child Classifications

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G01S 3/8022 CPC only CPC only
G01S 3/8025 CPC only CPC only
G01S 3/8027 CPC only CPC only
G01S 3/803 using amplitude comparison of signals derived from receiving transducers or transducer systems having differently-oriented directivity characteristics since 1990 +2 CPC IPC+CPC Available in IPC and CPC
G01S 3/805 using adjustment of real or effective orientation of directivity characteristics of a transducer or transducer system to give a desired condition of signal derived from that transducer or transducer system, e.g. to give a maximum or minimum signal since 1990 +1 CPC IPC+CPC Available in IPC and CPC
G01S 3/808 using transducers spaced apart and measuring phase or time difference between signals therefrom, i.e. path-difference systems since 1990 +2 CPC IPC+CPC Available in IPC and CPC
G01S 3/809 Rotating or oscillating beam systems using continuous analysis of received signal for determining direction in the plane of rotation or oscillation or for determining deviation from a predetermined direction in such a plane since 1990 IPC+CPC Available in IPC and CPC