Results on the detection of narrow-band low-level signals in a ship-induced noise field using high-resolution beamforming
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Abstract
In this report the performance of a high-resolution beamformer is compared to that of the conventional beamformer in detecting a low-level narrow-band signal in the vicinity of a number of high-level noise sources. This scenario may arise in areas where shipping noise is predominant, the acoustic field being dominated to a large part by the contributions of individual ships. In this study a comparative detection performance test is conducted with a simulated source embedded in a real ship-induced noise field and received on a 64-element towed array. The results shown suggest that in such noise fields the detection performance of the conventional planewave beamformer is greatly reduced due to a lack of resolving power. High-resolution techniques may overcome this difficulty and a detection improvement of 5% to 20% is obtained in the detection of a low-level target in the frequency range below 250 Hz. When the signal-to-noise ratio increases the performance of both algorithms is comparable
Report Number
SR-144Date
1988/07Author(s)
Jesus, Sergio M.
; Heitmeyer, Richard M.