多天线干涉阵的时间同步技术  

Time synchronization technology for Multi-antenna interferometric arrays

作　　者：王鹏宇 薛秀珍 魏伟 谢玮霖[1,2] WANG Pengyu;XUE Xiuzhen;WEI Wei;XIE Weilin(Key Laboratory of Photonic Information Technology,Ministry of Industry and Information Technology,School of Optics and Photonics,Beijing Institute of Technology,Beijing 100081,China;Yangtze Delta Region Academy of Beijing Institute of Technology,Jiaxing 31401l,China;Editorial Office of Optical Technology,School of Optics and Photonics,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]北京理工大学光电学院信息光子技术工业与信息化部重点实验室,北京100081 [2]北京理工大学长三角研究院(嘉兴),嘉兴314011 [3]北京理工大学光电学院《光学技术》编辑部,北京100081

出　　处：《光学技术》2023年第3期349-353,共5页Optical Technique

基　　金：国家自然科学基金(62271058,61827807)。

摘　　要：多天线干涉阵利用多个远端天线同时接收信号以提升探测灵敏度和角分辨率,其多路信号干涉合成的特性要求不同路之间高精度的时间同步。本文提出一种复用型分布式多路时间同步方法,利用单个数字延迟脉冲发生器对时间信号进行再生和分配,并设计了相应测量及控制算法,在精确测量多路光纤传输延时的同时,向多个远端天线分配稳定的时间信号。实验结果表明,系统在25km传输链路下具有ps级传输延时测量精度和优于20ps的时间信号分配精度。方案可同时支持本地回传信号数字化和远端数字化两种信号接收汇聚方案,在保证时间同步精度的同时有效降低了分布式同步系统的成本。Multi-antenna interferometric array utilizes multiple remote antennas to receive signals simultaneously to improve detection sensitivity and angular resolution.The multi-channel signal combination requires high-precision time synchronization between different channels.A multiplexing multi-channel time synchronization method is proposed.A single digital delay pulse generator is used to regenerate and distribute time signals,and the corresponding measurement and control algorithm is designed.While accurately measuring the transmission delay of multiple fiber optic links,stable time signals are distributed to multiple remote antennas.The experimental results show that the system has a ps level transmission delay measurement accuracy and a 20ps-level time signal distribution accuracy with 25km transmission.This solution can simultaneously support distributed systems with either local or remote digitization,effectively reducing the cost of the distributed synchronization system while ensuring time synchronization precision.

关 键 词：分布式探测 时间信号分配 延时测量 微波光子 

分 类 号：TN911.74[电子电信—通信与信息系统] TN913.7[电子电信—信息与通信工程]