ACOUSTIC DYNAMIC RANGE

THE PROPOSED PHASE I EFFORT WILL DEVELOP AN ACOUSTIC CHANNEL A/D CONVERTER, AND DIGITAL DECIMATION FILTER. THE ACOUSTIC CHANNELBIT WILL HAVE A DYNAMIC RANGE OF 120 DB. DEVELOPMENT COSTS WILL BE LESSENED BY USING A HYDROPHONE PREVIOUSLY DEVELOPED. THIS HYDROPHONE HAS A 144 DB DYNAMIC RANGE. THE CHANNEL ELECTRONICS WILL BE COMPOSED OF COMMERCIALLY AVAILABLE COMPONENTS. A PROTOTYPE CHANNEL WILL BE BUILT AND TESTED BOTH IN AIR AND WATER. MEASUREMENTS TO BE MADE INCLUDE SELF NOISE, TOTAL HARMONIC DISTORTION, PHASE ACCURACY AND GAIN SYSTEMS' ROCKVILLE, MD FACILITY AND PERFORM THE IN-THE-WATER TESTS AT LAKE PEND 0REILLE, ID. PHASE II WILL BE TO BUILD A SYSTEM FOR AT SEA TESTS ON A US NAVY TEST BED.