Naidu, Prabhakar S and Shankar, H Uday (1999) Broadband source localization in shallow water. In: Signal Processing, 72 (2). pp. 107-116.
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The null spectrum defined in multi image subspace algorithm (MISA) for source localization in shallow water possesses an interesting property, that is, when it is averaged over the signal bandwidth, its mean is found to cluster between 0.8 and 0.9, except at the actual source position where it is close to zero. Thus, the frequency-averaged null spectrum or its inverse is found to be an effective quantity for source localization. The signal peak to maximum side lobe ratio is found to increase as a square root of the number of frequency bins over which it is averaged. An approximate theoretical analysis has been carried out. The theoretical results broadly support the outcome of the numerical experiments. Further, we have shown that for broadband averaging to succeed the segment length must be much greater than the largest delay between the direct path and the furthest significant multipath.
|Item Type:||Journal Article|
|Additional Information:||Copyright of this article belongs to Elsevier Science BV.|
|Keywords:||Broadband;Incoherent averaging;Source localization;Shallow water;Bin size.|
|Department/Centre:||Division of Electrical Sciences > Electrical Communication Engineering|
|Date Deposited:||27 Feb 2009 11:40|
|Last Modified:||19 Sep 2010 04:59|
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