In order to analyze the effect of disturbance rejection rate on stability of the guidance system,the conception of seeker disturbance rejection rate parasitical loop was presented. A model of parasitical loop of seeker disturbance rejection rate was established based on the phase lag of seeker disturbance rejection rate. When the parasitical loop is feedforward and feedback, the stability zone of the parasitical loop is obtained based on the Routh criteria and the normalized model. The effect of phase lag on stability zone was analyzed in complex frequency domain. Simulation results show that the phase lag of seeker disturbance rejection rate reduces the stability zone. The smallest stability zone occurs at about - 140°phase lag instead of - 180°. As a result , it is helpful for the engineers at the preliminary stage of missile design.%为了分析隔离度对制导控制系统稳定性的影响,提出了隔离度寄生回路的概念,在考虑隔离度相位滞后的基础上,建立了导引头隔离度寄生回路模型,通过对寄生回路无量纲化并采用劳斯稳定判据计算得到了寄生回路负反馈和正反馈时的稳定域,在复频域分析了不同隔离度滞后角对寄生回路稳定域的影响.仿真证明相位滞后角的增大会降低系统的稳定域,但稳定域最小点不是出现在-180°相位滞后,而是出现在大约-140°时.所得结论对导弹制导控制系统初步方案确定具有指导作用.
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