全捷联导引头隔离度对制导稳定性的影响

Effect of strapdown seeker disturbance rejection rate on stability of PNG system

针对采用全捷联导引头的末制导问题,分析了产生隔离度的主要原因,建立了包含寄生回路的比例导引系统模型,基于时变系统的Lyapunov稳定性理论提出了制导系统的一致渐进稳定性,并利用无源性方法分析了制导系统的一致渐进稳定条件,研究了隔离度对比例导引制导稳定性的影响。结果表明,制导系统的一致渐进稳定条件比寄生回路更加严格,而不完全解耦后残余的隔离度具有不确定性,其正反馈更易导致比例导引系统提前失稳并造成较大脱靶量。

According to the problem of the terminal guidance with a strapdown seeker, the main reason of the disturbance rejection rate was analyzed. The proportional navigation guidance system （PNGs） with the disturbance rejection rate parasitical loop（DRRPL） was established, the uniformly asymptotical stability of PNGs was put forward based on Lyapunov stability theory for the time varying system, restrictions of stabilizing PNGs were analyzed with the passivity approach, and the effect of the disturbance rejection rate on the stability of PNGs was studied. The results show that the uniformly asymptotical stability of PNGs is stricter to realize than DRRPL, while the disturbance rejection rate caused by the imperfect decoupling is uncertain, and the positive feedback of DRRPL is more likely to make PNGs unstable in advance and cause a larger miss distance.