using antennas spaced apart and measuring phase or time difference between signals therefrom, i.e. path-difference systems

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 antennas spaced apart and measuring phase or time difference between signals therefrom, i.e. path-difference systems

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 antennas spaced apart and measuring phase or time difference between signals therefrom, i.e. path-difference systems

Of 3 combined children, 2 exist in both systems.

1 codes are CPC-only extensions.

Child Classifications

Navigate with arrow keys, Enter to open

G01S 3/465 CPC only CPC only
G01S 3/48 the waves arriving at the antennas being continuous or intermittent and the phase difference of signals derived therefrom being measured IPC+CPC Available in IPC and CPC
G01S 3/50 the waves arriving at the antennas being pulse modulated and the time difference of their arrival being measured IPC+CPC Available in IPC and CPC