一种并行AD采集系统的通道匹配误差研究  

Research of Channel Dismatch Errors in Parallel AD Acquisition System

作　　者：邵星灵[1,2] 杨卫[1,2] 王正言[1,2] 张文栋[1,2] 

机构地区：[1]中北大学电子测试技技术国家重点试验室山西太原030051 [2]中北大学仪器科学与动态测试教育部重点实验室,山西太原030051

出　　处：《压电与声光》2011年第2期332-335,共4页Piezoelectrics & Acoustooptics

基　　金：国家自然科学基金资助项目(60575027)

摘　　要：随着现代宽带雷达通讯的发展,对雷达回波信号的采集和目标的特征提取成为研究者关注的焦点。由于雷达回波的高频信号高达几十兆赫兹,时间交替采样模数转换器(ADC)系统便可在其中发挥重要作用,但这种结构会引入时间、增益和偏置3种主要的通道失配误差。该文对通道失配误差作了分析,建立了3种误差并存的非均匀采样信号频谱的数学模型,并在此基础上提出了该文的误差联合测量高效实时校正算法,最后在现场可编程门阵列(FPGA)中完成了整个算法的实现。With the development of modem broadband radar,a mount of researchers focus on broadband radar echo signal acquisitions and feature extraction of the target.Due to the high frequency echo signal with tens of MHz in bandwidth,the time interleaved ADC system is playing an important role in radar echo systems.But this structure will bring about three channel dismatch errors which were analyzed in detail in this paper.Mathematical model of unevenly sampled spectrum was established when all three mismatch errors exist together.Then presented the measure errors algorithm combined three errors according to the formulas of spectrum and the effective calibration algorithm.The algorithm was implemented in FPGA at last.

关 键 词：宽带雷达通讯 现场可编程门阵列(FPGA) 时间交替采样ADC 实时校正算法 

分 类 号：TP332.1[自动化与计算机技术—计算机系统结构]