Frequency activated direction indicator
Frequency agile sonic transducer
Frequency dispersive transmitting array
Frequency division beamforming for sonar arrays
Frequency domain adaptive filter for detection of sonar signals
Frequency domain non-linear signal processing apparatus and meth
Frequency independent acoustic antenna
Frequency independent directionally sensitive array in seismic s
Frequency interrupt continuous transmit active sonar transmissio
Frequency modulated laser diode
Frequency multiplexed seismic cable
Frequency-modulated monitor hydrophone system
Frequency-steered acoustic beam forming system and process
Frontal sonar
Full wave field vibratory seismic source
Full wave seismic recording system
Funnel construction for a dipping sonar
Fusing contact data for best-estimate solution