A path-following method for fixed-wing unmanned aerial vehicles(UAVs) is presented in this paper.This method consists of an outer guidance loop and an inner control loop.The guidance law relies on the idea of tracking a virtual target.The motion of the virtual target is explicitly specified.The main advantage of this guidance law is that it considers the maneuvering ability of the aircraft.The aircraft can asymptotically approach the defined path with smooth movements.Meanwhile,the aircraft can anticipate the upcoming transition of the flight path.Moreover,the inner adaptive flight control loop based on attractive manifolds can follow the command generated by the outer guidance loop.This adaptive control law introduces a first-order filter to avoid solving the partial differential equation in the immersion and invariance adaptive control.The performance of the proposed path-following method is validated by the numerical simulation.
现代武器装备系统具有造价高、层级多等特点,其效能评估存在着评估成本高、层间效能影响关系模糊等难点。该文在基于模型的系统工程(model-based systems engineering,MBSE)方法论的基础上,构造了模型驱动的系统效能评估方法,将系统建模引入效能评估,通过模型的分析和仿真,支持效能数据的获取与计算。与传统方法相比,该方法实施成本低、针对性强,显著提高了系统设计优化和开发决策的效率。该方法与系统设计之间结合紧密,适用于武器装备系统发展建设的全生命周期各个阶段,并且可实现不同粒度系统层级的精细化效能评估。以舰艇损管系统(damage control system,DCS)为例,验证了该方法的有效性。
