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隔离度会降低导引头输出信息的精度,增加导弹的脱靶量。针对激光平台导引头的隔离度问题,首先建立了考虑隔离度寄生回路的制导系统模型,经分析确定干扰力矩为引发隔离度的主要原因,并提出采用滤波算法对其进行估计补偿的方案。之后依据平台导引头的基本结构与干扰力矩的产生机理建立了用于在线辨识隔离度的非线性滤波模型,采用强跟踪无迹卡尔曼滤波算法(STUKF)补偿建模误差,解决了干扰力矩难以精确建模的问题,以对其进行在线辨识与前馈补偿。最后对所提方法进行了数学仿真与半实物仿真实验论证,实验结果表明:所提方法可增强导引头光轴对弹目视线角速度的跟踪能力,改善导引头输出制导信息的品质,并有效地抑制隔离度,达到提升系统制导精度的目的。
Isolation will reduce the accuracy of seeker output information, increase miss distance missiles. Aiming at the problem of the isolation of seeker in laser platform, the guidance system model of isolation parasitic loop is established. The main reason for the isolation is determined by the analysis of the disturbance torque, and a proposal of using filter algorithm to estimate compensation is proposed. Then the nonlinear filter model for on-line identification of isolation is established according to the basic structure of the seeker and the mechanism of disturbance torque. The STUKF algorithm is used to compensate the modeling error and solve the disturbance torque Difficult to accurately model the problem, to its online identification and feedforward compensation. Finally, the proposed method is verified by mathematical simulation and semi-physical simulation. The experimental results show that the proposed method can enhance the tracking ability of the seeker optical axis to the projectile gaze angular velocity and improve the quality of seeker output guidance information. Effectively inhibit the isolation, to improve the guidance accuracy of the system.