Research on Underwater Sound Source Localization Based on NLM-EEMD and FCM-Generalized Quadratic Correlation

<table class="table-group" id="tab2"><tr><td><table class="table"><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr class="thead"><td class="align_left"> </td><td class="align_center">Distance (m)</td><td class="align_center">Azimuth (degrees)</td><td class="align_center">Error (meters, degrees)</td></tr><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr><td class="align_left">Theoretical calculation</td><td class="align_center">85.1131</td><td class="align_center">109.9209.</td><td class="align_center"> </td></tr><tr><td class="align_left">Direct correlation</td><td class="align_center">Invalid</td><td class="align_center">Invalid</td><td class="align_center"> </td></tr><tr><td class="align_left">Generalized cross-correlation</td><td class="align_center">82.1087</td><td class="align_center">110.7588</td><td class="align_center">3.0044, 0.8379</td></tr><tr><td class="align_left">NLM-EEMD-FCM-generalized quadratic correlation</td><td class="align_center">83.5707</td><td class="align_center">110.6450</td><td class="align_center">1.5424, 0.7241</td></tr><tr class="table-tr"><td colspan="4"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Comparison of positioning results of three delay estimation methods.</div>

Shock and Vibration

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Table 2

Table 2: Research on Underwater Sound Source Localization Based on NLM-EEMD and FCM-Generalized Quadratic Correlation 