Abstract
Dr. Leon Sibul’s contributions to acoustical signal processing are extensive and highly significant. They are marked by a deep intuition and foresight, leading to new and fruitful concepts, especially in underwater acoustic processing. In this paper we discuss how Dr. Sibul’s contributions to adaptive array processing provided the conceptual basis for many of the modern approaches of model-based processing in ocean acoustics. In particular, we show how they were extended to incorporate sophisticated acoustical propagation models. Specifically, we discuss how his incorporation of propagation models in adaptive array processing schemes provided a new paradigm for such problems as source detection and localization. His concepts of an underlying physics-based estimation structure directly influenced efforts to develop environmentally adaptive processors that are capable of providing solutions to detection and localization problems. In this paper, we concentrate specifically on the model-based processing approach to the detection and localization problem, demonstrating how this area has progressed.
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