| 基于非均匀采样的频谱分析和弱信号检测 |
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| 引用本文： | 李进超.基于非均匀采样的频谱分析和弱信号检测[J].数据采集与处理,2012,27(3):320-326. |
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| 作者姓名： | 李进超 |
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| 作者单位： | 1. 重庆大学机械传动国家重点实验室,重庆,400030
2. 重庆大学机械传动国家重点实验室,重庆,400030;中国汽车工程研究院汽车噪声振动和安全技术国家重点实验室,重庆,400039 |
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| 基金项目： | 重庆大学机械传动国家重点实验室自主研究课题经费资助项目 |
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| 摘 要： | 由于采样设备和被采样信号的限制,完全的均匀采样很难实现,实际中很多情况也需要用到非均匀采样,而当采样信号是非均匀时采样定理不再适用。使用基于最小二乘法的非均匀频谱分析法,详细讨论了频谱噪声的产生原因和影响因素。由于频谱噪声会淹没一些弱信号的频率成分,使用基于最小二乘法的幅值衰减法,衰减强信号频率成分和频谱噪声,通过仿真实验成功检测出幅值为强信号幅值一亿分之一的弱信号,并对非均匀采样信号的频率成分进行高精度的参数估计。
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| 关 键 词： | 非均匀采样 最小二乘法 频谱分析 弱信号检测 |
| 收稿时间： | 2011/5/18 0:00:00 |
| 修稿时间： | 2012/4/26 0:00:00 |
Spectrum Analysis and Weak Signal Detection Based on Nonuniform Sampling |
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| lijinchao.Spectrum Analysis and Weak Signal Detection Based on Nonuniform Sampling[J].Journal of Data Acquisition & Processing,2012,27(3):320-326. |
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| Authors: | lijinchao |
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| Affiliation: | 1(1.State Key Laboratory of Mechanical Transmission,Chongqing University,Chongqing,400030,China;2.State Key Laboratory of Vehicle NVH and Safety Technology,China Automotive Engineering Research Institute,Chongqing,400039,China) |
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| Abstract: | The spectrum of the nonuniformly sampled signals is analyzed by means of the spectrum analysis based on least square technique.The reason for spectral noise and its influence factors are discussed.Since some weak signals are inundated with the spectral noise,the method for amplitude damping based on least square technique is used to suppress the strong signals and spectral noise effectively.The weak signal is detected successfully in the simulation experiment and its amplitude is one hundred million times smaller than the strong one.The parameters of the components of nonuniformly sampled signal can be estimated with high accuracy. |
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| Keywords: | nonuniform sampling least square method spectrum analysis weak signal detection |
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