It is an important basis for planning torpedo-defense-strategy of surface-ship to obtain the motion parameters of incoming torpedo. According to the torpedo defense characteristics,the principle of solving target-motion-parameters was analyzed based on 2B1D1V ( two-bearings, one-distance and one-velocity) model. According to the short time-bearing series coming from torpedo warning towed sonar in surface ship,the simulation and explanation were given by use of 2B1D1V model. The 3B1D( three-bearings and one-distance ) model and DBA ( distance-bearing adjustment ) model were compared with 2B1D1V model. The simulation data of 2B1D1V model were fitted,and the solving rules of torpedo trajec-tory dispersion were analyzed based on convergence rate. The research proves that the 2B1D1V model can satisfy the need of torpedo defense of surface ship to a certain extent.%对来袭鱼雷运动要素的掌握是水面舰艇制定鱼雷防御策略的重要依据.针对鱼雷防御态势特征,选择以两方位一距离一速度模型为基础展开鱼雷运动要素的解算原理分析.以水面舰艇拖曳式鱼雷报警声纳提供短暂的时间-方位序列为依据,利用两方位一距离一速度模型给出仿真说明,并与三方位一距离模型、一距离方位平差模型的仿真结果进行比较.对两方位一距离一速度模型的仿真结果进行数据拟合,并依据收敛率标准分析了鱼雷弹道散布的求解规律.研究证实,两方位一距离一速度法能够在一定程度上满足水面舰艇鱼雷防御的需要.
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