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Experimental Study on Depth Discrimination for A Moving Source with A Horizontal Array in Shallow Water

Acoustic source depth discrimination is a robust way to obtain depth information when source depth cannot be estimated accurately. This paper makes use of the fact that the low-order modes which are excited by surface sources generally have low amplitudes in a downward refracting shallow water environment. The depth discrimination depends on the trapped energy ratio in mode space. The performance of the maximum a posteriori mode filter is compared with other mode filters. For a moving source, it has been verified that the broadband processing and time integral can improve the detection rate when the expected false alarm rate is 0.01. Finally, experimental results show that time integral for a moving source can effectively discriminate the source depth.