Abstract
Receiver operator characteristics derived for post detection integration receivers are significantly perturbed if the signal power fluctuates with a characteristic time roughly two or more times the receiver integration time. In this paper, the effects on detection performance of slow fluctuations in both signal power and in noise power, such as occur in the 10–200-Hz region due to merchant shipping, are explicitly considered and are compared to results for signal fluctuations alone. Further degradation in detection performance in the region of PD ⩾ 0.5 is shown to occur and the sensitivity of the degradation to the characteristic times of the fluctuations and to the statistics of the noise power fluctuations is demonstrated. The effects of the noise statistics on experimental determination of sonar system performance is discussed.
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