基于小波去噪法的基坑监测数据处理
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摘要
受各种因素影响,地铁基坑监测数据除含有真实变形信息外,还存在噪声。应用MATLAB实现小波分析对监测数据的去噪处理和粗差探测仿真实验。实例表明,选取恰当的小波基函数和小波分解层数,通过小波分析的带通滤波的功能,能够对原始信号有效分频,从而在不同尺度上将粗差和噪声分离达到识别的效果。去噪之后的信号曲线有较好的光滑性,更能反映基坑周边土体的变形规律。
Affected by various factors,the monitoring data of subway foundation pit also has noises except the real deformation information.It is introduced application of the wavelet analysis of MATLAB to deal with the noise and make the gross error detection simulation experiment on the monitoring data.The instance shows that,to select the appropriate wavelet basis function and wavelet decomposition layers can make effective frequency division to the original signal through the wavelet analysis bandpass filter function,thus we can separate the gross error and noise in different scale to achieve the effect of recognition.The signal curve has good smoothness after de-noising,it can reflect the deformation law of soil around the foundation pit better.
Affected by various factors,the monitoring data of subway foundation pit also has noises except the real deformation information.It is introduced application of the wavelet analysis of MATLAB to deal with the noise and make the gross error detection simulation experiment on the monitoring data.The instance shows that,to select the appropriate wavelet basis function and wavelet decomposition layers can make effective frequency division to the original signal through the wavelet analysis bandpass filter function,thus we can separate the gross error and noise in different scale to achieve the effect of recognition.The signal curve has good smoothness after de-noising,it can reflect the deformation law of soil around the foundation pit better.
引文
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[11]夏秋,周金国.小波分析在GPS变形监测数据处理中的应用[J].地理空间信息,2011(6):40-41.
[2]王建波,栾元重,许君一,刘娜.小波分析桥梁变形监测数据处理[J].测绘科学,2012(3):80-81.
[3]唐桂文,江恒彪,左建章.基于小波阈值去噪理论的监测数据处理方法[J].测绘科学,2009(1):117-118.
[4]贺跃光,吴盛才,徐鹏.城市地铁安全监测数据分析与处理[J].工程勘察,2011(12):48-49.
[5]毛亚纯,贾葳葳,沙成满,王恩德,杨冬梅.边坡变形监测数据小波去噪研究[J].金属矿山,2010(9):137-138.
[6]李振,朱锋,陈家君.基于小波变换的桥梁风振变形监测数据处理[J].测绘通报,2011(11):18-19.
[7]沙磊,任超,彭家頔,文鸿雁.小波阈值消噪方法分析及应用[J].测绘信息与工程,2011(6):15-16.
[8]袁昌茂,文鸿雁.变形监测数据处理的小波去噪方法[J].地理空间信息,2009(4):137-138.
[9]黄声享,刘经南.GPS变形监测系统中消除噪声的一种有效方法[J].测绘学报,2002(2):104-105.
[10]李喜盼,扈静,李海刚.基于小波分析的GPS动态变形监测数据粗差识别模型研究[J].测绘通报,2011(4):7-9.
[11]夏秋,周金国.小波分析在GPS变形监测数据处理中的应用[J].地理空间信息,2011(6):40-41.