采用UKF的光学捷联导引头刻度尺误差补偿方法

Compensation method for scale error of optical strapdown seeker using UKF

针对光学捷联导引头刻度尺误差带来的隔离度问题,提出了一种基于无迹卡尔曼滤波(UKF)的刻度尺误差实时补偿方法。分析了刻度尺误差引起隔离度问题的机理,由弹目相对运动方程以及光学捷联导引头量测方程建立了考虑刻度尺误差影响的非线性滤波模型,采用UKF滤波算法,对刻度尺系数进行估计,并用所提出的补偿方法进行实时补偿,最后进行了数学仿真及半实物仿真验证。仿真结果表明:所提方法能够有效地估计出刻度尺系数,经补偿后改善了系统的稳定性,同时提高了制导精度。

Aiming at solving the disturbance rejection rate problem produced by scale error of optical strapdown seeker, a real time compensation method for scale error based on Unscented Kalman Filter （UKF） was proposed. The mechanism of disturbance rejection rate caused by scale error was analyzed, and the nonlinear filter model considering scale error was built by missile﹣target relative motion equation and optical strapdown seeker measurement equation, the UKF algorithm was adopted to estimate scale factors, and the scale errors were compensated by the method proposed, finally a math simulation and a hardware﹣in﹣loop simulation were put forward. The simulation results indicate that the scale factors can be estimated effectively by the method, and both of missile system stability and guidance accuracy are improved after the compensation.