Systems using reradiation of acoustic waves, e.g. IFF, i.e. identification of friend or foe

Full Title

Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems > Systems using reradiation of acoustic waves, e.g. IFF, i.e. identification of friend or foe

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