Detection of Fluctuating Sonar Targets
NAVAL ORDNANCE LAB WHITE OAK MD
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Fluctuations are characteristic of sounds in the sea. They affect detection by causing the detection probability of weak signals to be higher, and of strong signals to be lower, than in the absence of fluctuations. The effect can be expressed quantitatively by means of receiver operating characteristic ROC curves having a fluctuation index k as a parameter. The fluctuation- modified ROCs are found to be similar to conventional ROCs for non-fluctuating signals k1, but on probability coordinates have a slope that depends on the value of k. The application of the new ROCs is limited at the present time by a lack of knowledge concerning signal fluctuations and the values of k applicable to a given sonar detection problem.
- Acoustic Detection and Detectors