Active element array apparatus for displaced phase center...

Apparatus and method for suppressing reflections at an ultrasoun

Calibration of phased array ultrasound probe

Conformal array compensating beamformer

Depthimeter

Floating sensor to detect very low frequency pressure signals

Forward looking echosounder

Free-floating altitude stabilized system

Linear array lateral motion compensation method

Magnetic heading sensor alignment and roll reducing device

Method and apparatus for compensating sensitivity fluctuations i

Quantitative echo sounder and method of quantitative...

Self-aligning electroacoustic transducer for marine craft

Ship's attitude data converter

Signal processing method for a towed linear antenna

Sonar heave compensation system

Transducer mounting apparatus