| 基于改进小波阈值的激光陀螺漂移信号降噪 |
| |
| 引用本文： | 张通,张骏,张怡.基于改进小波阈值的激光陀螺漂移信号降噪[J].仪器仪表学报,2011,32(2):258-263. |
| |
| 作者姓名： | 张通 张骏 张怡 |
| |
| 作者单位： | 西北工业大学自动化学院,西安,710072 |
| |
| 基金项目： | 航天支撑基金(2009HTXGO)资助项目 |
| |
| 摘 要： | 针对固定阈值法对激光陀螺漂移信号去除噪声会出现"过扼杀"小波系数的现象,提出一种称为E-median的小波阈值.信号进行平稳小波变换,计算各尺度高频小波系数的E-median阈值,采用软阈值法修正高频小波系数,通过平稳小波逆变换重构信号.对激光陀螺漂移仿真信号和实测信号去除噪声,该阈值均能保留原信号的特征并有效去除噪声...
|
| 关 键 词： | 激光陀螺 随机漂移 平稳小波变换 信号降噪 小波阈值 |
Ring laser gyro drift signal denoising based on improved wavelet threshold |
| |
| Zhang Tong,Zhang Jun,Zhang Yi.Ring laser gyro drift signal denoising based on improved wavelet threshold[J].Chinese Journal of Scientific Instrument,2011,32(2):258-263. |
| |
| Authors: | Zhang Tong Zhang Jun Zhang Yi |
| |
| Affiliation: | Zhang Tong,Zhang Jun,Zhang Yi(College of Automation,Northwestern Polytechnic University,Xi'an 710072,China) |
| |
| Abstract: | In ring laser gyro drift signal denoising,universal threshold kills the significant wavelet coefficients because the threshold value is higher than what ought to be.This paper proposes a new wavelet threshold,called E-median threshold.The noisy signal is decomposed by stationary wavelet transform(SWT) for several levels.The E-median threshold is estimated by the detail at every level.The recovery signal is reconstructed based on inversed SWT.Simulations are carried out in MATLAB using ring laser gyro signal... |
| |
| Keywords: | ring laser gyro random drift stationary wavelet transform signal denoising wavelet threshold |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
|
