摘要
针对多通道雷达接收机中随机同步误差导致采集通道间回波信号数据难以对齐的问题,文中设计了一种全数字随机同步误差校正电路。采用基于FPGA-TDC(Field Programmable Gate Array-Time-to-Digital Converter)的高精度时间测量技术测量外触发到达时刻和系统时钟上升沿之间的相位差,根据编码和标定后的相位差信息确定相位补偿步长。采用FPGA混合模式时钟管理器(Mixed-Mode Clock Manager,MMCM)的动态移相模式对时钟进行精细的相位移动,完成系统时钟与脉冲回波信号之间的高精度同步。测试结果表明,所提电路精度优于70 psrms(root mean square),校正时间小于12μs,能够快速处理随机同步误差问题。
In view of the problem that the random synchronization error in multiple-channel radar receivers leads to the difficulty in aligning the echo signal data between the acquisition channels,this study designs an all-digital random synchronization error correction circuit.High-precision time measurement technology based on the FPGA-TDC(Field Programmable Gate Array-Time-to-Digital Converter)is used to measure the phase difference between the arrival moment of the external trigger and the rising edge of the system clock.The phase compensation step size is determined from the phase difference information after encoding and calibration.The dynamic phase shifting mode of the MMCM(Mixed-Mode Clock Manager)in the FPGA is used to finely adjust the clock phase,and complete the high-precision synchronization between the system clock and the pulse echo signal.Test results show that the accuracy of the proposed circuit is better than 70 ps rms(root mean square),and the correction time is less than 12μs,indicating that the proposed method is able to deal with the random synchronization error problem quickly.
作者
姚晓晨
徐杨
郑其斌
卜朝晖
唐高明
崔海坡
YAO Xiaochen;XU Yang;ZHENG Qibin;BU Zhaohui;TANG Gaoming;CUI Haipo(School of Health Science and Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Shanghai Spaceflight Measurement-Control and Communication Institute,Shanghai 200092,China)
出处
《电子科技》
2025年第6期9-15,共7页
Electronic Science and Technology
基金
国家自然科学基金(12105177)
上海航天科技创新基金(SAST2022-094)。
关键词
随机同步误差
多通道采集系统
误差校正
FPGA
时间数字转换
相位补偿
动态移相
MMCM
random synchronization error
multiple-channels data acquisition system
error correction
FPGA
time to digital convert
phase compensation
dynamic phase shift
MMCM
