Signal Detection by Arrays in Noise Fields with Local Variations

The signal‐detection capabilities of an array that is essentially DIMUS in nature are analyzed for the situation in which the background‐noise power from hydrophone to hydrophone is not the same. The signal to be detected is assumed to be a plane‐wave random time function. The signal power at different hydrophones is assumed to be constant. The performance of the DIMUS system, with infinite clippers, is compared to that for a similar array with purely linear signal processing. Results indicate that the performance of the system with infinite clippers is generally superior on a signal‐to‐noise basis and on the basis of normalized signal output.