导引头隔离度对寄生回路稳定性的影响  

Effect of seeker disturbance rejection rate on parasitical loop stability

作　　者：李富贵[1] 夏群利[1] 蔡春涛[1] 祁载康[1] 

机构地区：[1]北京理工大学宇航学院,北京100081

出　　处：《红外与激光工程》2013年第9期2341-2347,共7页Infrared and Laser Engineering

基　　金：中国博士后科学基金(2011M500008)

摘　　要：为研究隔离度对制导控制系统稳定性的影响,提出了隔离度传递函数的概念,建立了隔离度传递函数模型和隔离度寄生回路模型。基于此模型,利用频域法分析了隔离度传递函数的特性,利用劳斯判据研究了制导参数对寄生回路稳定域的影响以及制导系统阶数对寄生回路失稳频率的影响。结合某红外图像导引头实例,对隔离度传递函数和寄生回路稳定性进行了深入分析,最后提出了提高隔离度寄生回路稳定性的措施。研究表明:隔离度寄生回路稳定性最严重的区域位于中频段,而提高导引头稳定回路在该段的增益可有效提高导引头隔离度水平,增加寄生回路的稳定性。In order to analyze effects of disturbance rejection rate on stability of guidance and control systems, a conception of seeker disturbance rejection rate transfer function was presented. Both models of disturbance rejection rate transfer function and parasitical loop of seeker disturbance rejection rate were established. Then the characteristic of disturbance rejection rate transfer function was analyzed using frequency domain methods, and with Routh criteria the effect of guidance parameter on the stability zone of the parasitical loop as well as the influence of guidance dynamics orders on crossover frequency were studied. With an infrared image seeker, the disturbance rejection rate transfer function and stability of parasitical loop were analyzed further. Finally, measures for improving the disturbance rejection rate were presented. The study shows that the parasitical loop may go unstable in the middle frequency region mostly. Improving the gain of the seeker＇s stability loop in this frequency region is crucial to the disturbance rejection rate level and the stability margins.

关 键 词：导引头 隔离度传递函数 寄生回路 稳定性 

分 类 号：TJ765.3[兵器科学与技术—武器系统与运用工程]