一种双ADC垂直同步采样结构及其误差校正  

Dual-ADC vertical synchronous sampling structure and error correction

作　　者：卫洋斌 李浩[1] 孙晓平 曹佳伟 王志刚[1] Wei Yangbin;Li Hao;Sun Xiaoping;Cao Jiawei;Wang Zhigang(School of Automation Engineering,University of Electronic Science and Technology of China,Chengdu 611731,China)

机构地区：[1]电子科技大学自动化工程学院,成都611731

出　　处：《仪器仪表学报》2023年第12期141-149,共9页Chinese Journal of Scientific Instrument

基　　金：国家自然科学基金(62303091);中国博士后面上基金(2021M700707);四川省自然科学基金(2022NSFSC0905)项目资助。

摘　　要：航空航天、机械、声学、装备制造等领域对检测仪表的观测动态指标要求极高,甚至超出现有商用高分辨力数模转换器件的极限,因此,本文拟建立一种双ADC垂直同步采样的机制,通过数据流拼合的方式达到总动态范围扩展的目的。在双ADC硬件平台中,针对不同采样支路差异化所导致的量化数据延时误差,提出了一种基于拉格朗日插值Farrow结构滤波器的误差校正方法。仿真及硬件实验表明,本文提出的双ADC垂直同步采样架构将实验对象的动态范围提高了13.318 dB,同时本文提出的误差校正方法可以有效降低垂直同步采样通道之间的延时误差,进而使双ADC的动态范围扩展具备实用价值。The aerospace,mechanical,acoustic,and equipment manufacturing industries demand extremely high observation dynamic indicators for detection instruments,which even exceed the limits of existing commercially available high-resolution analog-to-digital converter devices.In this article,a dual-ADC vertical synchronous sampling mechanism is proposed to extend the total dynamic range through data stream splicing.A data correction method based on the Lagrange interpolation Farrow structure filter is introduced to address the quantization data delay error introduced by hardware differences between the acquisition ADC branches.Simulation and hardware experiments show that the proposed dual ADC vertical synchronous sampling architecture increases the dynamic range of the experimental object by 13.318 dB.Meanwhile,the proposed error correction method can effectively reduce the delay error between vertical synchronous sampling channels.Therefore,the dual ADC dynamic range expansion has the practical value.

关 键 词：垂直同步采样 FARROW结构 拉格朗日插值 延时校正 动态范围扩展 

分 类 号：TH85[机械工程—仪器科学与技术]