Abstract: The orientation resolution capacity of surface to two acoustic homing torpedoes with parallel salvo launched by submarine has important influence on command and decision-making of underwater acoustic warfare. Based on the above mentioned parallel salvo method, the mathematic model of the orientation angle of two torpedoes relative to target was established. The orientation angle of two torpedoes to target and its influence factors were calculated and analyzed at different tactical situations. The results indicate the orientation angle of two torpedoes is influenced by alarm distance of oncoming torpedo, salvo interval, salvo optimization coefficient, and homing performance of torpedo etc, and the orientation angle of two salvo torpedoes relative to target is about 3°~7° under the usual tactical condition. As the existing sonar could not differentiate the two torpedoes with parallel salvo veraciously, surface ship gives alarm and counters the two torpedoes as one torpedo usually.

Key words: operation research, parallel salvo, orientation angle, orientation resolution, acoustic homing torpedo