一阶Buterworth递归式带通滤波器技术改进方案

把一阶Ｂｕｔｔｅｒｗｏｒｔｈ递归式（ＦＢＲ）带通滤波器应用于滑动样本,输出序列出现了振幅和位相的相对误差。为了克服这种现象给制作中长期预报带来的困难,作者通过数值试验,分析了该滤波器的误差传递特性,并设计了“拟定初值的三步滤波方案”。大量试验表明,该方案可较为有效地抑制输出序列的误差和位相飘移

The Technical Advancement of the Recursive Bandpass Filter with the First-order Butterworth Function

By applying recursive bandpass filter based on the first-order Butterworth function to running samples,the relative amplitude and phase errors in the output sequence from those running input data are found. The propagation property of the errors in the output is analysed. To suppress the errors of the output,the "three steps recursion technique with developing initial output" procedure has been developed. A lots of tests show that this procedure can suppress the errors and phase shift in the output effectively.