偏置比例导引律在大气层外拦截器末制导中的应用

大气层外拦截器采用直接碰撞方式进行目标毁伤,要求脱靶量很小甚至零脱靶量.本文以大气层外拦截器为研究对象,考虑到脱靶量很小和拦截过程中的接近速度比较大,针对发动机只能提供常推力,能多次启动并具有脉冲工作状态,且不具有变推力工作状态的特性,运用偏置比例导引律设计了适合于轨控发动机的开关阈值.数学仿真结果表明,运用偏置比例导引确定的发动机开关线能够明显地减小脱靶量和轨控发动机的开关次数.

The Application of Biased Proportion Navigation Law to the Terminal Guidance of the Interceptor

The extra-atmospheric interceptor hits targets by the collision.So the miss distance must be decreased to nearly zero.Based on the extra-atmospheric interceptor,for the strict miss distance and the huge relative velocity,the engine thrust can not changed by adjusting the value or the direction,just can be shifted between on and off.Based on the biased proportional navigation(BPN) law,the on-off law is applied to the terminal guidance of the interceptor to decrease the miss distance.The mathematical simulation results show that the method can decrease the miss distance effectively and the amount of the on-offs of the trajectory-control engines.