Abstract: A new style of underwater warship defense is to integrally defend the acoustic self-guided torpedo with depth charge interception and maneuvering evasion. The correlation analysis for the survival probability of warship and the battlefield situation can provide elaborate reference for training analysis, discussion about tactics and even combat decision-making. In the research process of combat simulation and strategy optimization, two combat strategies of “depth charge interception + backward evasion” and “warship maneuvering + depth charge interception” are formed. The applicable regions of the two combat strategies are roughly divided, and the integral defense effects of the two strategies are analyzed by comparing the survival probabilities of warship under different battlefield situations. The numerical analysis examples of critical regions and the combat suggestions under different battlefield situations are given by using gradient analysis and elastic analysis methods, respectively. This study shows that a corresponding superior combat strategy should be adopted under different battlefield situations, especially, for early warning and detection of torpedo in long-distance and horizontal direction. Key

Key words: warship, torpedo, integrateddefense, combatdecision, correlationanalysis