全捷联导引头寄生回路影响与辨识校正

Effect of parasitic loop on strap-down seeker and compensated with identification method

为研究隔离度寄生回路对全捷联导引头的影响,建立了全捷联制导模型,基于此模型通过无量纲变换获得了无量纲动力学模型,采用劳斯判据和系数冻结法研究了剩余飞行时间、制导参数、刻度尺偏差对制导稳定性的影响,利用伴随函数法研究了刻度尺偏差对脱靶量的影响。基于辨识理论提出了全捷联导引头刻度尺偏差的辨识方法。研究表明,刻度尺偏差会恶化全捷联制导系统稳定性,增加需用末导时间,利用辨识方法可准确辨识出导引头刻度尺偏差予以补偿。研究结论可为全捷联制导设计提供参考和帮助。

In order to analyze the effects of disturbance rejection rate parasitic loop on strap-down seeker, the model of homing loop with strap-down seeker is established. Then a nondimensional model is derived. With Routh criteria and coefficient freezing method, the influence of the time to go, guidance parameter and a scale factor error on the stability of the guidance loop are studied. The adjoint method is used to derive the influence of the scale factor error on miss distance. Based on the identification theory, an identification method to identify the scale factor is presented. The study shows that the scale factor sharply decreases the guidance system stability of a strapdown seeker, and increases the needed flight time. With the identification method, the scale factor can be identified accurately. Thus it can be used to compensate the strap-down seeker. The research can provide technology reference to strap-down guidance system design.