Abstract
A simulation using linear maximal sequence (m-sequence) transmissions demonstrated the potential for detecting and tracking near-surface targets. In this simulation a low power, omnidirectional source and four omnidirectional hydrophones were arbitrarily located in water approximately 4 m deep. The simulated -15 dB target traveled at 1.5 kn. Using "channel digit response" processing and "block zeroing," the direct arrival, multipaths, clutter and reverberation were rejected. (The block zeroing process is very different from other methods typically labeled as "cancellation.") With the improved signal-to-interference ratio, a simple probability based algorithm demonstrated tracking at source-target distances of 250 m, the maximum range investigated.
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