基于零控脱靶量的大气层外拦截中制导研究

针对大气层外拦截中段采用耗尽关机固体燃料发动机的情况,设计了基于零控脱靶量的鲁棒中制导律。推导了系统状态转移矩阵,通过数值方法求解得到考虑地球扁率J2摄动项的拦截器零控脱靶状态,在此基础上将推力分解到视线方向和垂直视线方向,并根据垂直视线方向需要速度增量大小设计了推力分配比例系数,使得推力方向平稳变化且能快速减小系统的零控脱靶量。仿真表明,所设计的中制导律简单、可靠,便于工程实现,能有效提高拦截精度,并对发动机工作参数具有较强的鲁棒性。

Midcourse Guidance Based on Zero Effort Miss for Exo-Atmospheric Intercept

A robust midcourse guidance law based on the zero effort miss is designed for the middle flying stage of exo-atmospheric intercept with the fuel-exhaustion-shutoff solid engine.The system state transition matrix is deduced,so the zero effort miss of the interceptor can be solved with numerical method under considering the earth's oblateness effect of J2.In order to make the thrust direction change smoothly and make the zero effort miss decrease quickly,the engine thrust is decomposed along the line of sight direction and perpendicular to the line of sight direction,and the distribution proportion coefficient is designed based on the required velocity gain normal to the line of the sight.Simulations show that the midcourse guidance proposed in this paper is simple,reliable and convenient for realization.It can reduce the miss distance of the exo-atmospheric interception effectively and the guidance method has strong robustness with respect to engine burn parameters.