往复数字滤波器及其性能分析

Forth-Back Digital Filter and Performance Analysis

根据实际数据处理工作的需要 ,以减小信号相移量为目标 ,提出一种新的数字滤波算法 ,即所谓往复数字滤波器。从滤波效果出发 ,拟定了一组性能评价指标 ,并应用数学试验方法在拟定的评价指标下 ,对该算法与传统算法进行了性能对比分析。分析结果表明 ,该算法在信号的相位偏移、幅值衰减、波形畸变以及除噪能力和滤波效率等方面均优于传统算法。该算法结构简单、编程容易、占用存贮空间少、运行速度快 ,可适用于动态测试数据的预处理。

A new algorithm for digital filtration, namely Forth Back Digital Filter, is put forward for the need of actual data processing and reduction of the phase shift. From the point of view of usefulness, a series of the evaluative criteria is drawn up. By means of mathematical experiment, with the given elaluative criteria, the performance comparative analysis has been done for this algorithm against to the conventional one that was generally used as a pretreatment algorithm. It is shown that this algorithm is better than the conventional one in the phase shift, amplitude attenuation, waveform distortion, noise reduction, filtration efficiency, and so on. It is also excellent for its simple structure, easy programming, small size of memory, and running quickly. Therefore, it is suitable for data processing of dynamic measurement.