超宽带非周期信号等效采样的研究

Study on Equivalent Sampling of Nonperiodic UWB Signal

对超宽带窄脉冲信号需要进行高速采样才能有效采集,等效采样是一种实现超高速采样的有效手段。经过了时间间隔调制的超宽带脉冲串信号已经不是周期信号,而传统的等效采样一般都是以被采集信号的周期为前提的。提出了一种对于超宽带非周期信号等效采样的新方法,并对设计出的电路进行测试,得到了理想的测试结果。

In order to process sampling for the UWB narrow pulse effectively, the sampiing speed must be very high according to the Nyquist law, the equivalent time sampiing method is a valid solution for this problem in an simpler way. However, the tradition object of equivalent sampling is periodic signal, so it＇s necessary to improve the equivalent sampling method to adapt to the UWB pulses train after PPM, which changes the intervals of pulses according to PN code. In this paper, the improved sampling method and its implementing circuit are presented with the expected measurement results.