G PHYSICS
G01 MEASURING; TESTING
G01S 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
15/00 Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
G01S15/02 using reflection of acoustic waves
G01S15/06 Systems determining the position data of a target