Abstract:In this paper we present experimental results of a method for determining the path of a synthetic aperture sonar (SAS), with sub-centimeter accuracy, by autofocussing images of an active beacon. The beacon sits on the seabed, listens for sonar pings using a matched filter, and retransmits in a different frequency band after a fixed time delay. The sonar forms a separate image containing just this point-target, blurred by sonar motion, with a high signal to noise ratio (SNR) and no contamination from close rang… Show more
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