摘要
车载环境下由于加速度计自身和外界环境干扰等因素的影响,真实的加速度信号叠加了大量干扰信号。针对加速度计信号特点,采用小波阈值去噪对加速度计信号进行了滤波处理。建立一个振动信号模型,将真实的加速度计的输出噪声作为干扰成分叠加到该模型上,选择较优的小波参数,对仿真信号进行小波阈值去噪,去噪后信噪比(SNR)由4.24 dB提高到20.45 dB,均方根误差(RMSE)由0.051改善到0.008 1。据此对真实加速度计输出信号进行去噪处理,实验结果表明:小波阈值去噪对加速度信号具有良好的滤波效果。
The accelerometer output signal is often superimposed on a large number of disturbing signals as a result of the characteristic of accelerometer and the external environment noise. Aiming at characteristic of accelerometer signal, focuses on the filtering of the accelerometer signal based on the wavelet threshold de-noising method. A vibration signal model is established with a real output signal superimposed, select optimal wavelet parameters and process the simulated signal by wavelet threshold denoising, the signal-to-noise ratio （SNR）is increased from 4.24 dB to 20.45 dB, the root-mean-square error（RMSE） is improved from 0. 051 to 0. 008 1. On this basis, real output signal of accelerometer is processed by denoising, and it shows that wavelet threshold de- noising method works well on fihering acceleration signal.
出处
《传感器与微系统》
CSCD
北大核心
2013年第12期74-77,共4页
Transducer and Microsystem Technologies
基金
中科院第三期创新工程资助项目
关键词
车载平台
加速度计
小波分析
阈值去噪
vehicle platform
accelerometer
wavelet analysis
threshold de-noising
