导引头隔离度寄生回路对视线角速度提取的影响

Effect of Seeker Disturbance Rejection Rate Parasitic Loop on Line of Sight Rate Extraction

为在导弹总体设计中合理确定导引头视线角速度提取方式,研究提出了基于导引头隔离度寄生回路特性分析的视线角速度提取方式确定办法。建立了典型平台导引头的隔离度寄生回路模型,利用频域法解析分析了两种视线角速度提取方式下导引头隔离度传递函数、隔离度寄生回路和导弹制导系统特性的差异,利用劳斯判据研究了制导参数对寄生回路稳定性能的影响。结合某红外导引头,在典型飞行条件下数值分析验证了理论分析的正确性。研究表明导引头隔离度寄生回路特性直接影响导弹制导系统性能,不同的视线角速度提取方式下隔离度寄生回路特性不同,进而导致制导系统性能出现较大差异,而确定导引头的隔离度特性有助于选择合理的视线角速度提取方式以提高导弹制导性能。

To choose a reasonable line of sight rate extraction scheme of seeker in missile general design, a useful method is present based on analysis of characteristics of seeker disturbance rejection rate parasitic loop. A model of parasitic loop were established for a typical gimbaled seeker. Then using frequency domain methods the characteristic difference of disturbance rejection rate transfer function and parasitic loop as well as guidance system are analyzed for two kinds of extraction scheme. The effect of guidance parameters on the parasitic loop stability region is studied with Routh criteria. Using an infrared image seeker＇ s parameters, simulation is done under typical flight condition to confirm the theoretical analysis. The study shows that the parasitic loop can change characteristics of guidance system, and line of sight rate extraction schemes also have essential effect on stability and stable performance of guidance system due to parasitic loop. To identify characteristics of seeker disturbance rejection rate is useful for determining line of sight rate extraction scheme.