using radio waves

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

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 radio waves

Of 5 combined children, 4 exist in both systems.

1 codes are CPC-only extensions.

1 shared codes have differing titles between IPC and CPC.

Child Classifications

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G01S 3/023 +1 CPC CPC only CPC only
G01S 3/04 Details +2 CPC IPC+CPC Available in IPC and CPC
G01S 3/14 Systems for determining direction or deviation from predetermined direction +2 CPC IPC+CPC Available in IPC and CPC
G01S 3/72 Diversity systems specially adapted for direction-finding IPC+CPC Available in IPC and CPC
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) IPC+CPC Available in IPC and CPC