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针对侵彻制导武器BTT末制导中滚转指令奇异性问题,采用基于偏导的灵敏度方法,分析了BTT-90逻辑中奇异性产生的机理及主要影响因素;通过对末制导使用的弹道成型制导律无量纲过载分析,结合实际弹道仿真,总结了指令随时间变化规律即奇异性仅存于过载指令过零阶段.以此为基础,提出一种将BTT控制划分为正常控制与奇异性区域,并在奇异性控制区采用滚转指令平滑算法的奇异性控制策略,完成了切换条件设计.仿真结果证明,奇异性控制策略可消除由于制导指令过零带来的滚转角指令跳变现象,且对制导精度影响小.
Aiming at the singularity problem of the rolling command in the BTT guidance system of the penetrating guided weapon, the mechanism and main influencing factors of the singularity in BTT-90 logic are analyzed by using the sensitivity method based on partial derivative. By using the ballistic guidance Based on the lawless dimension overloading analysis and the actual ballistic simulation, the law of the variation of the command over time is summarized, that is, the singularity exists only in the zero-crossing phase of the overload command.On the basis of this, a method is proposed to divide the BTT control into normal control and singularity regions, And the singularity control strategy of roll instruction smoothing algorithm is adopted in the singularity control region to complete the switching condition design.The simulation results show that the singularity control strategy can eliminate the jump phenomenon of roll angle instruction due to zeroing of the guidance instruction and Little effect on guidance accuracy.