This paper deals with nonsingular guidance and control design for an interceptor, using a decoupled approach, steered by the combined effects of both canard and tail, to intercept a moving but non-maneuvering target at a time specified a priori. First, interceptor's desired lateral acceleration, consisting of nominal and corrective components, is derived using deviated pursuit guidance. While the nominal component is the pursuit guidance law, the corrective component drives the time-to-go error to zero within a finite-time in an optimal manner. Using a desired error dynamics and a meaningful performance index, the lateral acceleration demand is minimized during the transient phase. With exact knowledge of time-to-go and the consideration of nonlinear kinematic model, the proposed design circumvents the errors arising out of any approximations. Interceptor's canard and tail deflection commands are derived using predefined-time convergent sliding mode control, which allows the autopilot to precisely track the commanded lateral acceleration within a time specified during design. Finally, simulations are presented for various cases to demonstrate the efficacy of the proposed design.

本文针对拦截器的非奇异制导和控制设计，采用分离的方法，通过鸭嘴和尾巴的组合作用来控制，以在先验指定的时间拦截移动但非机动的目标。首先，拦截器的期望侧向加速度由标称和修正分量组成，是使用偏离的追击制导推导出来的。虽然标称成分是追击制导律，但校正成分则以最佳方式在有限的时间内将通行时间误差驱动为零。使用所需的误差动态特性和有意义的性能指标，可以在过渡阶段将横向加速度需求降至最低。有了准确的运行时间知识并考虑了非线性运动学模型，所提出的设计规避了由任何近似值引起的误差。使用预定义的时间收敛滑模控制可得出拦截器的前，后尾偏转指令，该指令可使自动驾驶仪在设计期间指定的时间内精确跟踪指令的横向加速度。最后，针对各种情况进行了仿真，以证明所提出设计的有效性。