PULSE-TO-PULSE COHERENT DOPPLER SONAR DEVELOPMENT

A RESEARCH AND DEVELOPMENT PROJECT IS PROPOSED TO DEVELOP A PULSE-TOPULSE COHERENT ACOUSTIC DOPPLER CURRENT PROFILER (ADCP). THIS ADCP WILL PROVIDE APPROXIMATELY A FACTOR OF 100 IMPROVEMENT OVER CONVENTIONAL ADCP'S IN BOTH SHORT-TERM MEAN WATER FLOW VELOCITIES AND DEPTH RESOLUTION. IN ADDITION, SMALL SCALE TURBULENCE LEVELS APPROACHING AMBIENT OCEAN TURBULENCE LEVELS MAY BE DIRECTLY COMPUTED FROM THE DOPPLER ECHO SPECTRUM SECOND MOMENT. THE PRIMARY PHASE I OBJECTIVES ARE TO INVESTIGATE TECHNIQUES OF IMPROVING THE QUALITY AND VELOCITY RANGE OF MEAN FLOW VELOCITY AND SMALL SCALE TURBULENCE MEASUREMENT, AND ACHIEVE A VELOCITY/TURBULENCE PROFILING RANGE TO SEVERAL HUNDRED METERS.