Abstract
Traditional signal-processing techniques such as replica correlation and narrow-band filtering are ineffective for noise rejection when one uses a wide-band source in an active sonar system. Some signal processors such as cross-covariance and integrated-square-law detectors, however, can take advantage of the available high time-bandwidth products for noise rejection. Output statistics for such devices are well known for the case of identical signals in uncorrelated noise fields. But this is an optimistic case for sonar applications where the signals are consecutive target echoes that will decorrelate with target aspect and multipath changes, and where the noises may be fairly stable and, therefore, correlated reverberation. Output statistics were developed, which included the effects of signal and noise correlation. Detection thresholds were then calculated from the output statistics.
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