考虑目标机动的固定配平飞行器制导方法

针对固定配平飞行器追踪地面机动目标问题,提出具有螺旋机动的制导律。首先,建立了误差角、误差平面描述飞行器-机动目标相对运动的数学模型并讨论了误差角对飞行器末速度的影响。在此基础上,考虑飞行器控制能力,设计了连续非线性形式的误差角指令。然后,考虑地面机动目标的情况,采用扩张状态观测器对其加速度进行估计,并采用预测模型得到虚拟目标点运动信息。最后,设计了含有虚拟目标点的指数形式收敛的制导律。仿真结果表明,该螺旋机动制导律能保证飞行器精确跟踪地面机动目标,并具有鲁棒性。

Guidance law for fixed-trim vehicle against maneuvering target

For fixed-trim vehicle against maneuvering targets,a spiral guidance law is presented. Firstly, a mathematical model is established for describing relative motions between vehicles and maneuvering targets with the error angle and the error plane. Influence on the terminal velocity caused by the error angle is discussed. After that, continuous nonlinear error angle command is designed considering the vehicle control ability. Then, acceleration of maneuvering targets on the ground is estimated by the extended state observer, and virtual target motion information is got by the prediction model. Finally, an exponential convergence terminal guidance law is designed with virtual target added in. Numerical simulation results show that the proposed terminal guidance law is effective for fixed-trim vehicles against maneuvering targets on the ground and that it is robust.