高速数据采集系统工频陷波频域算法研究
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摘要
工频干扰相对高速采集系统内的信号频段极窄,时域内工频陷波需要很好的衰减特性,传统IIR、FIR等时域方法设计需要非常高的阶数,软硬件实现较为困难。以高采样率地震电磁辐射脉冲观测系统为例,结合系统核心处理器TMS320C6416的特点,选择频域滤波算法,并对此算法加以改进,使之能够实现信号的完美重构并满足系统的实时性要求,理论证明该算法原理简单、耗时少,能够有效抑制地震电磁脉冲工频干扰,仿真结果也验证了该算法的有效性。
With respect to high speed acquisition system,the band of power line interference is extreme narrow.In the design of power line interference filter with traditional IIR and FIR methods,there is a need of a high order filter of favorable attenuation characteristics,it is hard for hardware and software to realize.Considering the wide frequency bandwidth of seismic electromagnetic radiation pulse,high sampling rate in the observation system and the characteristic of TMS320C6416,an improved algorithm of frequency domain filtering is presented.This algorithm has the advantages of simple principle and less time consuming by theoretical proof and is helpful to realize the signal reconstruction perfectly.The simulation results have proved the effectiveness of the algorithm.
With respect to high speed acquisition system,the band of power line interference is extreme narrow.In the design of power line interference filter with traditional IIR and FIR methods,there is a need of a high order filter of favorable attenuation characteristics,it is hard for hardware and software to realize.Considering the wide frequency bandwidth of seismic electromagnetic radiation pulse,high sampling rate in the observation system and the characteristic of TMS320C6416,an improved algorithm of frequency domain filtering is presented.This algorithm has the advantages of simple principle and less time consuming by theoretical proof and is helpful to realize the signal reconstruction perfectly.The simulation results have proved the effectiveness of the algorithm.
引文
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3 Xia Hongrui.Elimination of 50Hz power interference viawavelet packet transform and sine function simulation[J].Progress in Exploration Geophysics,2005,28(5):341-344.
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6兰瑞芬,胡广书.高采样率下简单整系数工频陷波器的设计[J].航天医学与医学工程,2008,21(2):152-156.(Lan Ruifen and Hu Guangshu.Design of simple integralcoefficient notch filter to remove power-line interference inhigh sampling[J].Space Medicine&Medical Enginering,2008,21(2):152-156)
7胡爱群,雷静.扩频通信中大功率窄带干扰抑制的一种频域自适应算法[J].东南大学学报,1999,29(4):52-56.(Hu Aiqun and Lei Jing.An adaptive algorithm in frequencydomain for NBI suppression in spread spectrum communica-tions[J].Journal of Southeast University,1999,29(4):52-56)
8安黄彬,沈有余.一种基于频域滤波的窄带干扰消除方法[J].光电子技术与信息,2005,18(5):64-68.(AnHuangbin and Shen Youyu.A method to suppress narrow-band interference based on frequency domain filter[J].Op-toelectronic Technology&Information,2005,18(5):64-68)
9谢梁聘,朱德恒.FFT频域分析算法抑制窄带干扰的研究[J].高电压技术,2000,26(4):6-8.(Xie Liangpin andZhu Deheng.Research of spectrum analysis based on FFTfor suppressing narrow-band interference in PD signal[J].High Voltage Engineering,2000,26(4):6-8)
10 Kopf U and Feser K.Rejection of narrow-band noise andrepetitive pulses in on-site PD measurements[J].IEEETrans D&EI,1995,6:1 180.
11丁康,张晓飞.频谱校正理论的发展[J].振动工程学报,2000,13(1):14-22.(Ding Kang and Zhang Xiaofei.Development of spectrum correction[J].Journal of Vibra-tion Engineering,2000,13(1):14-22)
12程佩清.数字信号处理教程[M].北京:清华大学出版社,2001.(Chen Peiqing.Tutorial of digital signal process-ing[M].Beijing:Tsinhua University Press,2001)
13朱长青,刘尚合,魏明.强电磁脉冲的有效带宽、测量带宽及来自上升时间的影响[J].强激光与粒子束,2005,27(1):99-103.(Zhu Changqing,Liu Sanghe and WeiMing.Effective bandwidth,measurement bandwidth andaffect from the rise time of strong electromagnetic pulse[J].High power Laser and Particle Beams,2005,27(1):99-103)
14 TMS320C6414/5/6T Data Sheet(Rev.D).Texas Instru-ments Inc.
2 Thakor N V and Zhu Y.Applications of adaptive filtering toECG analysis:noise cancellation and arrhythmia detection[J].IEEE Trans Biomed Eng,1991,38(8):785-793.
3 Xia Hongrui.Elimination of 50Hz power interference viawavelet packet transform and sine function simulation[J].Progress in Exploration Geophysics,2005,28(5):341-344.
4王镇,蔡萍.用于去除心电信号中工频干扰数字滤波技术[J].电子测量技术,2000,(2):43-47.(Wang Zhen andCai Ping.Digital filtering technique for eliminating power-line interference from the ECG[J].Electronic MeasurementTechnology,2000,(2):43-47)
5 Lynn P A.Online digital filter for biological signals:somefast designs for a small computer[J].Med.&Biol.Eng.&Comput.,1977,15:534.
6兰瑞芬,胡广书.高采样率下简单整系数工频陷波器的设计[J].航天医学与医学工程,2008,21(2):152-156.(Lan Ruifen and Hu Guangshu.Design of simple integralcoefficient notch filter to remove power-line interference inhigh sampling[J].Space Medicine&Medical Enginering,2008,21(2):152-156)
7胡爱群,雷静.扩频通信中大功率窄带干扰抑制的一种频域自适应算法[J].东南大学学报,1999,29(4):52-56.(Hu Aiqun and Lei Jing.An adaptive algorithm in frequencydomain for NBI suppression in spread spectrum communica-tions[J].Journal of Southeast University,1999,29(4):52-56)
8安黄彬,沈有余.一种基于频域滤波的窄带干扰消除方法[J].光电子技术与信息,2005,18(5):64-68.(AnHuangbin and Shen Youyu.A method to suppress narrow-band interference based on frequency domain filter[J].Op-toelectronic Technology&Information,2005,18(5):64-68)
9谢梁聘,朱德恒.FFT频域分析算法抑制窄带干扰的研究[J].高电压技术,2000,26(4):6-8.(Xie Liangpin andZhu Deheng.Research of spectrum analysis based on FFTfor suppressing narrow-band interference in PD signal[J].High Voltage Engineering,2000,26(4):6-8)
10 Kopf U and Feser K.Rejection of narrow-band noise andrepetitive pulses in on-site PD measurements[J].IEEETrans D&EI,1995,6:1 180.
11丁康,张晓飞.频谱校正理论的发展[J].振动工程学报,2000,13(1):14-22.(Ding Kang and Zhang Xiaofei.Development of spectrum correction[J].Journal of Vibra-tion Engineering,2000,13(1):14-22)
12程佩清.数字信号处理教程[M].北京:清华大学出版社,2001.(Chen Peiqing.Tutorial of digital signal process-ing[M].Beijing:Tsinhua University Press,2001)
13朱长青,刘尚合,魏明.强电磁脉冲的有效带宽、测量带宽及来自上升时间的影响[J].强激光与粒子束,2005,27(1):99-103.(Zhu Changqing,Liu Sanghe and WeiMing.Effective bandwidth,measurement bandwidth andaffect from the rise time of strong electromagnetic pulse[J].High power Laser and Particle Beams,2005,27(1):99-103)
14 TMS320C6414/5/6T Data Sheet(Rev.D).Texas Instru-ments Inc.
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