光学磁场传感器中超宽带模拟信号的重构  

A New Way of Ultra-Wideband Analog Signal Reconstruction in the Optical Sensor for Electromagnetic Measurement

作　　者：苏洋[1] 李玉权[1] 

机构地区：[1]解放军理工大学通信工程学院光纤通信实验室,南京210007

出　　处：《微波学报》2007年第6期67-70,共4页Journal of Microwaves

基　　金：国家自然科学基金资助项目(60472007)

摘　　要：为了解决光学脉冲磁场传感器中超宽带模拟光信号的数据采集与波形重构,本文提出了一种基于频带分割与频谱搬移的模拟信号重构方法。在频域上采用分割滤波器进行频带分割,在每个采样通道内对输入的子带信号进行采样,降低了对ADC采样速率的要求,再由各个通道的采样序列重构原模拟信号。该方法有效解决了光学磁场传感器中带宽高达几千兆赫的信号无法直接进行A/D转换的难题。给出了重构算法并进行了计算机仿真。仿真结果证实,滤波器的特性决定了重构的精度。所提出的方法具有较高的信号重构精度和较小的频谱失真。In order to resolve the data acquisition and signal reconstruction of ultra-wideband （UWB） analogy signal in the optical sensor for electromagnetic measurement. A new way for high accuracy reconstruction based on interruption and shift of frequency spectrum is proposed. The frequency spectrum is interrupted by sub-band filters and the sub-band signal is sampled in each channel. Finally the sampled sequences of each channel are used to reconstruct the original signal. This method effectively solves the problem of direct A/D conversion of the UWB signals up to several GHz. The reconstruction scheme is given and the simulation is made. The simulation results verify the good performance of the reconstruction scheme.

关 键 词：信号重构 数据采集 频带分割 频谱搬移 超宽带信号 

分 类 号：TP212.9[自动化与计算机技术—检测技术与自动化装置]