Abstract
Low Frequency Analysis and Recording Fixing (LOFIX) is a conventional method for localization of underwater target using multiple omnidirectional passive sonobuoys. The key of LOFIX is the relationship between the received signal strength of each sonobuoy and the target-sonobuoys distance. However, the fluctuation of the sound field deduced by the ocean environment often degrades the performance of LOFIX significantly. To solve this problem, a new localization method based on the interference characteristics of the sound field excited by the sound source near the water surface is presented in this paper. Numerical simulations and lake experiment verify the effectiveness of our presented method.
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