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。

Disturbance rejection rate(DRR) not only affects output accuracy of the seeker but also worsens the performance of missile guidance system. The main factor which causes the problem of DRR with laser gimbaled seeker is the disturbing torque. Aiming at the problem caused by DRR, a real time method for compensating disturbing torque based on Strong Tracking Unscented Kalman Filter(STUKF) was proposed. With the analysis of gimbaled seeker′s operational principle and disturbing torque′s mechanism, the nonlinear filter model for estimating the damping and spring torque was built. The STUKF algorithm was adopted to estimate the disturbing torque quickly and accurately, and the DRR was inhibited by the proposed method. Finally a math simulation and a hardware-in-loop simulation were put forward, the simulation results indicate that the accuracy of the seeker′s output and stable performance of guidance system are improved after the disturbing torque is compensated.