导引头隔离度机理及其寄生回路频域影响分析

Research on Disturbance Rejection Rate Mechanism of Seeker and Frequency Domain Analysis for Parasitic Loop

针对不同导引头隔离度机理、正负反馈性质和影响程度的不同,提出了基于末制导时间、制导权系数、系统阶数、攻角时间常数以及末制导时间常数的制导控制系统稳定性频域分析方法,直观地反映了不同的飞行阶段、导弹过载能力及控制系统快速性下不同因素产生的隔离度的幅相影响差别。分析结果表明,平台导引头弹簧力矩和全捷联正反馈较其他因素在需用制导频率附近存在更严重的制导回路失稳风险。

According to different formation mechanisms,positive or negative feedback characteristics and influence of disturbance rejection rate,a method of frequency domain for guidance and control system based on terminal guidance time,guidance of weights,and system order number was established. This method can intuitively reflect amplitude and phase influence difference of positive and negative feedback under different flight phases,missile overload capacity and speed of control system. The result shows that the influence of spring torque and positive feedback belong to disturbance rejection rate present more seriously instability risk.