Doppler velocimeter for monitoring groundwater flow
Doppler velocity profiler
Doppler-effect vehicle ground speed detecting apparatus having m
Doppler-effect vehicle ground speed detecting apparatus with mea
Doppler-effect vehicle ground-speed detecting apparatus having m
Double phase-lock-loop sonar
Downhole ultrasonic transit-time flowmetering means and method
Drag antenna
Dual mode sonar system
Dual reference surface transducer
Dual reflected energy beam alignment system
Dual-band ultrasonic motion detector
Dual-head multibeam sonar apparatus and method for tracking obje
Dynamic control circuit for multichannel system
Dynamic filter tuning for pulse-echo ranging systems
Dynamic underwater position tracking of small objects