摘要
无人机作为航空飞行器的一种,具有诸多应用价值,精确的航迹跟踪是其完成飞行任务的必要条件。在无人机飞行控制系统的制导外回路,实现一种具有抗风性能的横向非线性制导算法(NLG),基于航迹参考点实时测算无人机侧向加速度,并根据无人机力学方程得到滚转角指令,实现无人机的航迹跟踪。该制导算法只需确定合适的距离参数L,即可实现较为精确地制导,加入反馈环节以得到改进的闭环非线性制导算法。在侧风条件下进行仿真分析,结果表明:改进后的非线性制导算法是正确的,其具有良好的抗风性能。
As a kind of the aeronautic aircraft,UAV(unmanned aerial vehicle)is born to be of practical application value.Accurate path tracking is a necessary condition for UAV to complete the flight task.A non-linear guidance(NLG)algorithm for UAV path tracking is realized in the guidance outer-loop of the UAV flight control system,which is of the lateral wind resistance.Based on the virtual target on the path,the algorithm will instantaneously calculate the desired lateral acceleration of the UAV,and then get the roll angle command by the UAV motion equation to finally realize the path tracking of UAV.This guidance method can work on quite accurately only with the appropriate distance parameter L.A feedback term is considered and added to get the modified one in closed loop.Simulation experiments are conducted under the lateral windy settings.The results show that the modified nonlinear guidance algorithm is accurate,and is of good wind resistance.
出处
《航空工程进展》
CSCD
2015年第4期427-432,共6页
Advances in Aeronautical Science and Engineering
基金
中国博士后科学基金(2014M562652)
关键词
无人机
航迹跟踪
非线性制导
反馈算法
抗风性能
UAV
path tracking
nonlinear guidance
feedback algorithm
wind resistance
作者简介
冒云慧(1991-),女,硕士研究生。主要研究方向:元人机制导控制技术、多机编队控制方法。
陈清阳(1982-),男,博士,讲师。主要研究方向:飞行器导航制导与控制、无人机编队飞行。
侯中喜(1973-),男,博士,教授。主要研究方向:临近空间飞行器技术。
通信作者:郭正(1974-),男,博士,教授。主要研究方向:空气动力学、飞行器气动设计、计算流体力学。guozheng@nudt.edu.cn