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针对目前难以准确地对设备产生的电磁辐射进行测量的问题,文中提出了一种基于小波分析的电磁干扰(EMI)噪声测量技术,该技术利用小波变换的时频局部化特性,基于阈值函数滤波方法对测试信号进行分频滤波处理,使得可以在开阔场地或有噪声干扰之处对设备进行电磁干扰测量。仿真与实验结果表明,该技术能在30 Hz~1000 MHz的频段内较好的消除或衰减噪声。
Aiming at the problem that it is difficult to accurately measure the electromagnetic radiation generated by the equipment at present, this paper presents a measurement technique of electromagnetic noise (EMI) based on wavelet analysis. This technique utilizes the time-frequency localization of wavelet transform, The method divides the filtering of the test signal and makes it possible to measure the electromagnetic interference of the equipment in the open area or in the place of noisy interference. The simulation and experimental results show that this technique can eliminate or attenuate the noise better in the frequency range from 30 Hz to 1000 MHz.