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针对弹体滚转情况下两框架平台式导引头的伺服控制问题,基于导引头运动学和动力学,建立了导引头稳定回路模型。结合弹体滚转条件下的导引头输入指令和输出视线角速率关系,构建了视线闭环回路。针对偏航、俯仰通道间的解耦控制问题,推导出解耦条件,要求两通道由失调角到光轴转动角速度的传递函数相同。仿真分析了该模型在视线角输入以及弹体姿态扰动输入时,弹体滚转对导引头跟踪精度产生的影响,并由此提出了滚转角速度前馈补偿控制方案。结果表明,采用结合滚转角前馈补偿控制的两框架平台式导引头方案可以满足滚转弹的制导精度要求。
Aiming at the servo control problem of the two-frame platform seeker under the rolling of the projectile, the seeker’s stable loop model is established based on the kinematics and dynamics of the seeker. Combined with the relationship between the input command of the seeker and the output line-of-sight angular velocity, the closed loop of sight line is constructed. For decoupling control between yaw and pitch channels, the decoupling conditions are derived, and the transfer functions of the two channels from the misalignment angle to the angular rotation speed of the optical axis are required to be the same. The impact of projectile rolling on seeker tracking accuracy is analyzed by simulation when the input of sight line angle and input of projectile attitude disturbances are simulated. The control scheme of feedforward compensation of roll angular velocity is proposed. The results show that the two-frame platform seeker with combined feedforward compensation control of roll angle can meet the guidance accuracy requirement of rolling projectile.