Abstract
Oceanographic and acoustic conditions in littoral environments are extremely complex and dynamic. Spatial and temporal variability of low-frequency signal and noise fields destroys the basic homogeneous assumptions associated with standard tactical search concepts, like simple ladder patterns. Genetic algorithms have recently been applied to the signal part of this problem [D. P. Kierstead and D. R. DelBalzo, ‘‘A genetic algorithm approach for planning search paths in complicated environments,’’ Military Operations Research Journal (March/April 2003)] to produce near-optimal, nonstandard search tracks that maximize probability of detection in uniform noise fields. In a complex environment, an optimal search plan will also depend on the spatial and temporal properties of AN. The dynamic ambient noise model (DANM) was used to produce low-frequency directional noise fields, based on discrete ship tracks. Then, optimal genetic search tracks were calculated for towed arrays, in the midst of spatial variability and temporal fluctuations of noise. The results show the importance of careful consideration of AN when designing optimum tactics. [Work sponsored by NAVSEA under the LCS project.]
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