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在表面测量数据采集系统中,针对抗混叠滤波器设计问题,提出了“模拟滤波器+数字滤波器”的设计方法.设计了具有线性相位的有限脉冲响应(FIR)型抗混叠数字滤波器,得出了幅频特性和相频特性,满足了表面测量信号处理的要求.与传统的单纯模拟抗混叠滤波器相比,该方法有效降低了对模拟滤波器的设计要求,使其易于实现,滤波效果好.把该方法应用于表面测量系统中,通过对实测数据的应用试验,验证了滤波器的性能.
In the surface measurement data acquisition system, aiming at the anti-aliasing filter design problem, a design method of “analog filter + digital filter” is proposed.The finite impulse response (FIR) anti-aliasing Digital filter, the amplitude-frequency characteristics and phase-frequency characteristics are obtained, which meet the requirements of surface measurement signal processing.Compared with the traditional analog anti-aliasing filter, the proposed method effectively reduces the design requirements of the analog filter, Which makes it easy to realize and has good filtering effect.This method is applied to the surface measurement system and the performance of the filter is verified through the application test of the measured data.