Abstract
The effect of multipath induced time spread on the detectability of impulsive signals transmitted in shallow water is considered. The effective signal duration and temporal shape of received signal energy, two related features of the pulse spread associated with propagation, were analyzed for the shallow-water coastal environments in the DARPA Area Characterization Tests (ACT I, II, and III). Measured multipath induced time spreads were between 30 and 40 ms and, for each environment, the integrated received energy was found to be well fitted by an exponential function of the integration time. Using the observed signal energy durations and shapes, a model of energy detection of impulsive signals in shallow water was formulated and will be described. An analysis of expected performance (probability of signal detection for fixed probability of false alarm) as a function of input signal-to-background energy ratio and integration time will be presented.
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