基于小波分析的车载激光雷达冲击振动噪声处理方法研究
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摘要
针对车载激光雷达输出信号精度受冲击振动噪声影响的问题,建立了冲击振动激励与电路振动噪声响应之间的数学模型,提出了一种基于小波分析的噪声消除方法。该方法通过对车载激光雷达输入冲击激励信号进行小波分析,对输出振动噪声响应信号进行高斯函数拟合,建立了二者间的关联函数,在此基础上设计了输出噪声处理算法。仿真结果表明,该算法对冲击振动引起的车载激光雷达输出噪声有明显消噪效果。
To solve the problem that the accuracy of the output signal of the vehicle-borne Li DAR is affected by the impact vibration noise, a mathematic model of response between the impact vibration excitation and the circuit vibration noise was established. And a noise elimination method based on wavelet analysis was proposed that made wavelet analysis to the input impact exciting signal of the vehicle-borne Li DAR and used the Gaussian function to fit the output vibration noise response signal. Then the correlation function between these two signals was established, and on this basis, the output noise processing algorithm was designed. The simulation results show that the algorithm has obvious de-noising effect on the noise of the vehicle-borne Li DAR caused by impact vibration.
To solve the problem that the accuracy of the output signal of the vehicle-borne Li DAR is affected by the impact vibration noise, a mathematic model of response between the impact vibration excitation and the circuit vibration noise was established. And a noise elimination method based on wavelet analysis was proposed that made wavelet analysis to the input impact exciting signal of the vehicle-borne Li DAR and used the Gaussian function to fit the output vibration noise response signal. Then the correlation function between these two signals was established, and on this basis, the output noise processing algorithm was designed. The simulation results show that the algorithm has obvious de-noising effect on the noise of the vehicle-borne Li DAR caused by impact vibration.
引文
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2 洪光烈,郭亮.线振动对合成孔径激光雷达成像的影响分析.光学学报,2012,32(4):262~268.
3 徐显文,洪光烈,凌元,等.合成孔径激光雷达振动相位误差的模拟探测.光学学报,2011,31(5):112~118.
4 胡俊文,周国荣.小波分析在振动信号去噪中的应用.机械工程与自动化,2010,28(1):128~130.
5 李冠,吴尽昭,范明钰.基于小波的信号去噪分析.通信技术,2010,43(9):79~81.
6 文伟,张军,宫世超,等.路面冲击噪声研究及工程应用.汽车技术,2015,(5):29~31.
7 陈婷,赵文峻,马天飞.路面激励下变速器箱体疲劳寿命预估方法研究.汽车技术,2012(11):30~34.
8 胡起伟,王广彦,石全,等.爆炸冲击振动环境下电子装备损伤仿真研究.兵工学报,2012,33(1):13~18.
9 李增局,吴谨,刘国国,等.振动影响机载合成孔径激光雷达成像初步研究.光学学报,2010,30(4):994~1001.
10 左万里,苏小平,田海兰.汽车振动系统的分析研究.机械设计与制造,2011(2):112~113.
11 汪小朋,刘文彬,黄俊杰,等.路面随机激励下的汽车振动仿真分析.山东交通学院学报,2010,18(3):7~11.
12 冷雪原.冲击振动压路机振动机构仿真研究:[学位论文].西安:长安大学,2010.
13 Yi T H,Li H N.Noise smoothing for structural vibration test signals using an improved wavelet thresholding technique.Sensors,2012,12(4):11205~11220.
14 刘时华,张亚.基于小波分析对信号噪声的处理及应用.机械工程与自动化,2015,2(1):84~85.