基于SAWF的亚皮秒级时间间隔测量  

Sub picosecond time interval measurement based on SAWF

作　　者：沈建国[1] 庄锋杰 许施杰 袁浏 SHEN Jianguo;ZHUANG Fengjie;XU Shijie;YUAN liu(College of Physics and Electronic Information Engineering,Zhejiang Normal University,Jinhua 321004,China)

机构地区：[1]浙江师范大学物理与电子信息工程学院,浙江金华321004

出　　处：《浙江师范大学学报（自然科学版）》2023年第1期24-29,共6页Journal of Zhejiang Normal University:Natural Sciences

基　　金：浙江省自然科学基金资助项目(LY17F050003);浙江省大学生新苗人才计划项目(2021R404064)。

摘　　要：高精度时间间隔测量在通信、雷达、卫星等领域都具有十分重要的意义,为进一步提高时间间隔的测量精度,研究了一种基于声表面波滤波器作为时间内插器的亚皮秒级时间间隔测量方法.该方法由脉冲信号激励声表面波滤波器产生窄带信号,经采样、插值重建后,通过互相关算法获取待测的时间间隔,首先通过仿真分析声表面波滤波器的中心频率、采样频率、信噪比等关键参数对测量精度的影响;然后优化系统参数,提供一种低成本、易实现的解决方案;最后开展实验验证.测试结果表明,采用中心频率为70 MHz的声表面波滤波器,采样频率只需200 MHz,时间间隔的测量精度就可优于1.00 ps(标准差).High-precision time interval measurement was generally thought to be of great significance in communication,radar,satellite and other fields.In order to further improve the accuracy of time interval measurement,a sub-picosecond time interval measurement method based on a surface acoustic wave filter as a time interpolator was studied.In the proposed method,the surface acoustic wave filter was excited by the pulse signal to generate a narrow-band signal,and after sampling,interpolation and reconstruction,the time interval to be measured was obtained through the cross-correlation algorithm.Firstly,the influence of key parameters such as the center frequency,sampling frequency,and signal-to-noise ratio of the SAW filter on the measurement accuracy were analyzed through simulation.Then the system parameters were optimized to provide a low-cost and easy-to-implement solution.Finally,the experimental verification was carried out.The test results showed that using a surface acoustic wave filter with a center frequency of 70 MHz,the sampling frequency was 200 MHz,and the time interval measurement accuracy was better than 1.00 ps standard deviation.

关 键 词：时间间隔测量 亚皮秒 声表面波滤波器 插值重建 互相关算法 

分 类 号：TN911.7[电子电信—通信与信息系统]