为了分析雷达导引头隔离度对制导回路的影响,提出了考虑隔离度相位滞后的寄生回路模型,利用无量纲化方法分析了不同相位滞后对隔离度寄生回路稳定性的影响,确定了正反馈比负反馈具有更小的稳定域,而最小稳定域出现在滞后为-90°~-180°之间并进一步确定了滞后超过-90°时稳定特性与正反馈情况相似。该结论在工程应用中对提高制导回路稳定性具有重要意义。

In order to analyzing the effect of disturbance rejection ratio on guidance loop for radar-seeker, parasitical loop model considering disturbance rejection ratio with phase lag was proposed. After the analysis of stable zone of parasitical loop with phase lag based on non-dimensional-normalization method, it is concluded that the stable zone of the feedfoward is smaller than feedback, the smallest stable range occurs between -180° and -90° phase lag but not -180°, and when the phase lag is over -90°, the stable zone is close to the case when the phase lag is -180°. These conclusions have great significance for improving stability of guidance loop in engineering applications.