Generalized likelihood ratio detector with horizontal linear array in presence of interference in uncertain shallow-water environment

Abstract

Environmental uncertainties and interference are the main factors affecting the detection performance for detection problems in a shallow-water environment. To obtain robust performance, an interference and environmental uncertainties-constrained generalized likelihood ratio detector (IEU-GLRD) is proposed based on a horizontal linear array (HLA). The uncertainty sets of signal and interference wavefronts are used by IEU-GLRD, which contain different uncertainties when the interference source bearing relative to the HLA is known a priori. Due to the difference in the uncertainties, the signal, which is not in the uncertainty set of the interference, can be detected, while the interference is suppressed under different environmental parameters. The performance of IEU-GLRD is robust when the signal wavefront is approximately orthogonal to any interference wavefronts. The interference immunity of IEU-GLRD is mainly determined by the bearing of the interference source and the sediment sound speed, which is stronger when the interference source tends to the broad side and the sediment sound speed is lower.