二代小波降噪在激光陀螺信号滤波中的应用

为了抑制激光陀螺的随机漂移,提高其使用精度,提出了一种改进的第二代小波变换降噪方法对陀螺随机漂移测试数据进行滤波处理.该方法在二代小波变换时采用多组预测器和更新器,根据变换样本与相邻样本之间的相关性检测信号的局部特征,确定每个尺度上的每个变换样本的最佳预测器和更新器,使小波能够较好地适应信号的局部特征.该方法克服了传统小波变换降噪方法的缺陷,不仅可以有效地去除原始信号中的噪声,而且能够保留原始信号的局部特征.运用该方法对激光陀螺测试数据进行了滤波降噪实验,并用Allan方差法对不同降噪算法的降噪效果进行了比较分析,实验结果验证了该方法的有效性和优越性.

Signal de-noising based on second generation wavelet transform for laser gyro filtering

In order to restrain the random shift error and improve the practical precision of laser gyro,an improved de-noising algorithm was proposed for second generation wavelet transform.The several groups of predictor and updater were adopted to perform second generation wavelet transform,and the local characteristics of the signal were detected according to the correlativity between transformed sample and adjacent sample,thus,the optimal predictor and updater of each sample on each scale were defined,so as to en...