一种改进的视线角加速度非线性估计与滤波方法研究

为消除采用跟踪-微分器渐进估计视线角加速度形成非线性比例微分(PD)型比例导引以提高末制导精度时因减小估计器产生的视线角加速度延迟形成的估计抖振噪声,提出了一种具有输出限幅的非线性跟踪-微分器和输出二阶低通滤波的视线角加速度估计滤波方案。仿真结果表明,该方案可明显减少估计抖振噪声和误差。滤波器参数对视线角加速度估计的消噪噪声和制导精度提高作用明显,一般宜采用低阻尼比的二阶低通滤波器。

A Modified Nonlinear Estimator of LOS-Angle Acceleration with LOS-Rate Measurement Only

A scheme of LOS angle acceleration estimator with the output limiter and a second-order low-pass output filter was put forward in this paper,which was to eliminate the dither noise of estimated value caused by decreasing the LOS angle acceleration delay formed by the estimator when nonlinear proportional navigation for using tracking-differential to estimate LOS angle acceleration was applied to improve the accuracy of terminal guidance.The simulation result showed that this scheme would decrease the dither noise and error significantly.The estimator parameters selected properly was benefit to the reducing of the noise and error.In general,the damp ratio of the second-order low-pass output filter should be small.