using amplitude comparison of signals derived from receiving transducers or transducer systems having differently-oriented directivity characteristics

Introduced: January 1990

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 ultrasonic, sonic or infrasonic waves > Systems for determining direction or deviation from predetermined direction > using amplitude comparison of signals derived from receiving transducers or transducer systems having differently-oriented directivity characteristics

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