J2项摄动下的远程拦截耗尽关机中制导律设计  

Design of Mid-Course Guidance Law Considering J2 Perturbation for Long-Range Fuel-Exhaustion-Shutoff Interceptor

作　　者：呼卫军[1] 王欢[1] 周军[1] 

机构地区：[1]西北工业大学精确制导与控制研究所,西安710068

出　　处：《宇航学报》2017年第7期694-703,共10页Journal of Astronautics

基　　金：国家自然科学基金(61473226);西北工业大学基础研究基金(F030107)

摘　　要：为实现远程高精度动能拦截,针对使用固态燃料发动机的拦截弹在强时间约束下的耗尽关机问题,本文设计一种基于通用能量管理(GEM)的闭环中制导律。该制导律首先考虑了地球非球形J2摄动项对弹道影响,改进Lambert问题求解算法,在小计算量的情况下修正了因地球扁率摄动在远程拦截长时段飞行过程中引起的需求速度求解偏差,将其精度提升一个数量级。然后在GEM基础上给出了一种能量调制角虚拟映射关系实现了能量调制初段指令平滑过渡,并改变近关机点推力定向策略解决了临近关机时指令发散问题。在制导过程中加速度计反馈环节的引入增强了对推进系统参数的鲁棒性。六自由度仿真表明,相比传统GEM制导律,该制导律精度更高,任务适应性强。In order to realize remote and high precision kinetic energy interception, a closed-loop mid-course guidance law based on general energy management （ GEM ） is designed to solve the problem of the exhaustion shut down of an interceptor with solid fuel engine under strong time constraints. In this paper, the impact of the non-spherical J2 perturbation on the trajectory is firstly considered to improve the algorithm of the Lambert problem and correct the deviation of the demand velocity caused by the Earth oblateness perturbation in the long-range interception, elevating the deman（] velocity accuracy by an order of magnitude. Then, an energy modulation angle virtual mapping relationship is presented based on the GEM to achieve the attitude command smooth transition during the energy modulation initial stage. And the near-off point thrust direction strategy is changed to solve the command divergence problem. The introduction of the aeeelerometer feedback in the guidance process enhances the robustness to the propulsion system parameters. Six-degree-of- freedom simulation shows that this guidance law is more accurate and adaptable than the conventional GEM guidance law.

关 键 词：通用能量管理(GEM) Lambert问题 地球扁率 需求速度 虚拟映射 

分 类 号：V412.4[航空宇航科学与技术—航空宇航推进理论与工程]