平台导引头隔离度特性研究

Analysis on the Characteristics of Seeker Disturbance Rejection Rate

为了研究平台导引头在不同视线角速度提取方式下的隔离度特性,建立了基于惯性基准的典型平台导引头隔离度模型和隔离度寄生回路模型,分析了噪声对不同视线角速度提取的影响,推导出了干扰力矩下不同提取方式的隔离度传递函数,利用无量纲化方法和劳斯判据分析了隔离度寄生回路稳定性。研究表明:不同视线角速度提取点对不同噪声敏感度不同,制导系统参数、干扰力矩类型和视线角速度提取方式均会对隔离度寄生回路稳定性造成影响,在导引头不同主要干扰因素下选择合理的视线角速度提取方式有助于提高制导系统性能。

In order to study the disturbance rejection rate characteristics of platform seeker under different line of sight rate extraction schemes, the disturbance rejection rate model and its parasitical loop model of typical platform seeker based on inertial reference are established. The inffluence of noise on extraction of line of sight rate is analyzed, the disturbance rejection rate transfer function of different extraction schemes under disturbance torque is deduced, and the stability of disturbance rejection rate parasitic loop is analyzed with immeasurable method and routh criterion. The results show that dirent extraction points have different sensitivity to different noise, the stability of disturbance parasitic loop will be influenced by the parameters of guidance system, disturbance torque types and line of sight rate extraction schemes. Selecting reasonable line of sight rate extraction scheme under different disturbance factors of seeker will help to improve the performance of the guidance system.