当不能准确掌握目标运动信息时，对鱼雷发射平台而言，目标位置散布于一定的区域之内。要提高鱼雷搜索捕捉目标的概率，可利用鱼雷航程远的特性，设计一种扩展螺旋机动搜索弹道，使鱼雷搜索范围尽可能地覆盖目标散布区域。基于这种设想，提出描述鱼雷扩展螺旋机动搜索弹道的参数和确定方法，并对这种弹道进行仿真和分析，得出其适用条件和不足之处。%When the moving information of target can′t be accurately gained, for the torpedo send platform, the target is distributing in a certain area. In order to promote the finding probability, the character of long sailing capacity of torpedo can be used to design an expanding spirality trajectory, this can render the torpedo to cover the target distributing area. Based on this assumption, the parameters to describe torpedo expanding spirality trajectory are brought forward, the trajectory is simulated and analyzed, its application conditions and its disadvantages are concluded.
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