Details

Introduced: September 1968

Last revised: January 2006

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 > using radio waves > Details

Classification Context

Section:: PHYSICS
Class:: MEASURING; TESTING
Subclass:: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES

4 direct subcodes

Child Classifications

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G01S 3/06 Means for increasing effective directivity, e.g. by combining signals having differently-oriented directivity characteristics or by sharpening the envelope waveform of the signal derived from a rotating or oscillating beam antenna
G01S 3/08 Means for reducing polarisation errors, e.g. by use of Adcock or spaced loop antenna systems
G01S 3/1 Means for reducing or compensating for quadrantal, site, or like errors
G01S 3/12 Means for determining sense of direction, e.g. by combining signals from directional antenna or goniometer search coil with those from non-directional antenna