wherein the transmitter and receiver are mounted on the moving object, e.g. for determining ground speed, drift angle, ground track

Full Title

Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems > using reflection of acoustic waves (G01S15/66 takes precedence) > Systems of measurement, based on relative movement of the target > Velocity or trajectory determination systems; Sense-of-movement determination systems > wherein the transmitter and receiver are mounted on the moving object, e.g. for determining ground speed, drift angle, ground track