derived from different combinations of signals from separate antennas, e.g. comparing sum with difference

Introduced: September 1968

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 radio waves > Systems for determining direction or deviation from predetermined direction > using amplitude comparison of signals derived simultaneously from receiving antennas or antenna systems having differently-oriented directivity characteristics > derived from different combinations of signals from separate antennas, e.g. comparing sum with difference

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 > Systems for determining direction or deviation from predetermined direction > using amplitude comparison of signals derived simultaneously from receiving antennas or antenna systems having differently-oriented directivity characteristics > derived from different combinations of signals from separate antennas, e.g. comparing sum with difference

Of 3 combined children, 2 exist in both systems.

1 codes are CPC-only extensions.

Child Classifications

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G01S 3/325 CPC only CPC only
G01S 3/34 the separate antennas comprising one directional antenna and one non-directional antenna, e.g. combination of loop and open antennas producing a reversed cardioid directivity characteristic IPC+CPC Available in IPC and CPC
G01S 3/36 the separate antennas having differently-oriented directivity characteristics IPC+CPC Available in IPC and CPC