Detection based on multiple time-reversal guide-sources

Abstract

The problem of inclusion of multiple guide-sources in a time-reversal detection system is discussed. The objective of the detector is the coverage of a given volume over range and depth in a known environment. This detector should rely on as few guide-sources as possible. This detection problem is analyzed in terms of a separable kernel receiver (SKR). The performance of the SKR in terms of the number and placement of guide-sources is shown to depend on the 2-D inner-product of the guide-source covariance with the expected signal covariance. This single number can be used as an overall measure of system quality. Numerical examples are shown for several shallow water environments with various numbers and placements of guide-sources. The use of extended reflectors for use in an active system is also considered. [Work supported by ONR.]