捷联成像导引头隔离度寄生回路及其内部动力学影响研究

Research on Disturbance Rejection Rate Parasitic Loop and Its Dynamics Effect of Strapdown Imaging Seeker

针对捷联成像导引头实际工程应用中的隔离度寄生回路问题,分析了隔离度寄生回路产生的原因,建立了可反映不同内部动力学结构的制导回路及其隔离度寄生回路模型。通过无量纲化法,研究了无量纲剩余制导时间、不同内部动力学和导引头延时对隔离度寄生回路稳定域的影响。利用无量纲伴随函数法,研究了隔离度及其不同内部动力学对比例导引制导系统的影响。研究表明,刻度尺系数误差引起隔离度寄生回路正反馈稳定域受制导剩余时间的影响,隔离度负反馈的稳定域受到制导系统内部动力学影响;相位滞后引起的隔离度寄生回路稳定性主要受导引头延时的影响。隔离度正反馈对比例导引制导系统影响大于负反馈,脱靶量随着隔离度水平的增大而加大。制导系统内部动力学结构影响制导系统精度。

The disturbance rejection rate parasitic loop in strapdown imaging seeker is analyzed,and the guidance loop reflecting different internal dynamics structure and the model of disturbance rejection rate parasitic loop are established. The effects of time-to-go,different internal dynamics and time delay of seeker on the stability region of disturbance rejection rate parasitic loop are studied. Based on dimensionless adjoint function method,the effects of disturbance rejection rate and different internal dynamics on the proportional guidance system are also studied. The results show that the positive feedback stability region of disturbance rejection rate parasitic loop is affected by time-to-go,and the negative feedback stability region is affected by internal dynamics. The stability of parasitic loop caused by phase lag is mainly affected by the time delay of seeker. The effect of disturbance rejection rate positive feedback on proportional guidance system is more significant than that of the negative feedback. Miss distance increases with the increase in disturbance rejection rate. The internal dynamics structure of guidance system affects the guidance precision.