default Active detection performance sensitivity to target depth and aspect changes in a shallow water environment

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Active detection performance sensitivity to target depth and aspect changes in a shallow water environment. NURC-FR-2006-006 / SR-433. April 2006.

The variations on the performance of LFAS systems in coastal areas due to target depth and aspect are examined. The analysis is based on real data acquired during the BASE ’02 sea trial conducted using NURC’s LFAS system and a conventional submarine as cooperative target. Three structured scenarios and one free play are considered. The structured cases include: a) single depth change, b) three moderate aspect changes due to zigzag manoeuvering associated with three target depth changes, one for each aspect, and c) multiple depth and aspect changes due to target manoeuvering in conjunction with abrupt source depth changes. The free play, with only depth constraints, demonstrated the challenges of detection in the littoral when target manoeuvering enjoys many degrees of freedom.