Based on the omnidirectional moving submarine targets, and the actual searching prcess of anti-submarine airplane, the wind factor affeacting searching prcess was analyzed. Extended spirality searching model of dipping sonar and submarine moving models were built. According to the models of active/passive dipping sonar, searching ranges of active/passive dipping sonar were discussed. In the factor of given ocean environment, experimental results simulated and analyzed the extended spirality searching course of dipping sonar, and searching ranges of dipping sonar for different target strengthesand emission frequency. The experimentation compared and analyzed the influence of the varieties of seaching range of dipping sonar, submarine moving manners on extended square, extended circle and extended spirality searching manners. The experimental results indicate that the search efficiency of extended spirality searching manner of dipping sonar is better than extended square and extended circle.
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