导引头隔离度寄生回路稳定性及测试方法

为研究导引头隔离度寄生回路稳定性,基于典型平台导引头建立了隔离度传递函数和隔离度寄生回路模型,提出了2种基于半实物仿真试验的寄生回路稳定性测试评价方法. 利用频域法解析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与寄生回路稳定域的影响. 结合某红外图像导引头,在典型飞行条件下数值分析了隔离度传递函数特性和隔离度寄生回路稳定性能,并利用实验验证了隔离度寄生回路稳定性测试方法的有效性. 研究表明寄生回路稳定性最严重的区域位于中频段,制导参数和隔离度传递函数的幅相特性均对寄生回路的稳定性有重要影响. 

Stability and Measurement of Seeker Disturbance Rejection Rate Parasitic Loop

To study the stability of seeker disturbance rejection rate parasitic loop, models of disturbance rejection rate transfer function and parasitic loop were established for a typical gimbaled seeker. Two kinds of experiment systems for evaluating the stability of disturbance rejection rate parasitic loop were also proposed. Then, the characteristic of disturbance rejection rate transfer function was analyzed by using frequency domain methods. The effect of guidance parameters on the parasitic loop stability region was studied by employing Routh criteria. For an infrared imaging seeker with particular parameters, the disturbance rejection rate transfer function and stability of parasitic loop were analyzed under typical flight condition and the effectiveness of proposed test method for inspecting parasitic loop's stability was experimentally verified. The results show that the parasitic loop may go unstable in the middle frequency mostly. Both the guidance parameters and amplitude-phase characteristic of the disturbance rejection rate transfer function affect the stability of parasitic loop significantly.