带通采样在数据采集中的应用研究

Investigation on the Application of Bandpass Sampling in Data Acquisition

在数据采集中采用带通采样,可大大降低采样率,但系统中的抗混叠滤波器会造成相位的非线性。采用对滤波后的信号进行带通采样,然后再用FRR滤波器校正相位的非线性,从而不失真地还原原信号,最后在Matlab中进行仿真,验证了该方法的有效性。

The application of bandpass sampling in data acquisition can reduce the sampling frequency greatly.But the anti-aliasing filter in the system would bring the phase nonlinearity.So a new method is introduced in this article.In the method,sample the signal which has been through the anti-aliasing filter using bandpass sampling technique firstly,then correct the phase nonlinearity using FRR filter and resume the original signal.The simulation test has testified the validity of this method.