Effects of Ambient Shipping Noise on the Performance of Single and MultipleChannel Moment Detectors for Unknown Transient Signals

摘要

Second, third, and fourth order moments are used for passive detection ofsimulated transient signals embedded in both simulated independent Gaussian noise and measured noise. The measured noise was recorded by a vertical array located near the San Diego harbor and is dominated at low frequencies by ship-generated noise. The detectors do not assume noise or signal stationarity, and can use either one, two, or p channels of data for the p-th order moment detector. Detection simulations using six synthetic transient signals embedded in the measured noise reveal that the fourth order moment detector often detects better than the second order moment (or energy) detector in both the Gaussian noise and the measured noise. Although the application of one-dimensional passband filters before the moment calculations improves the performance of all three detectors, it induces additional detection gain for the higher order moment detectors.