iii TABLE OF CONTENTS
نویسنده
چکیده
High frequency ambient noise has a significant impact on the operation of many Sonars and related systems. Therefore, understanding the temporal and spatial distributions of this noise in shallow water is crucial. Existing highbandwidth acoustic data acquisition systems are large and complex. This project has developed a novel stand-alone, portable, and compact cylindrical package (23cm ! by 60cm length) that can be rapidly and flexibly deployed in various configurations. It has 4 simultaneous sampling analog channels (up to 5MSa/s aggregate) and is capable of beamforming in 3D space using a tetrahedral array configuration. This system has provided both time-space distributions and directivity of high frequency ambient noise in Singapore waters for the first time.
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