Results on the detection of narrow-band low-level signals in a ship-induced noise field using high-resolution beamforming
In this report the performance of a high-resolution beamformer is compared to that of the conventionalbeamformer in detecting a low-level narrow-band signal in the vicinity of a number of high-level noisesources. This scenario may arise in areas where shipping noise is predominant, the acoustic fieldbeing dominated to a large part by the contributions of individual ships. In this study a comparativedetection performance test is conducted with a simulated source embedded in a real ship-inducednoise field and received on a 64-element towed array. The results shown suggest that in such noisefields the detection performance of the conventional planewave beamformer is greatly reduced due toa lack of resolving power. High-resolution techniques may overcome this difficulty and a detectionimprovement of 5% to 20% is obtained in the detection of a low-level target in the frequency rangebelow 250 Hz. When the signal-to-noise ratio increases the performance of both algorithms iscomparable
Jesus, Sergio M.;
Heitmeyer, Richard M.