基于相推法的空间光载射频链路绝对延时测量  

Absolute Time Delay Measurement for Radio over Free-Space-Optical Links Based on Phase-Derived Method

作　　者：孙修远 王辉 徐忠扬 冯利鹏 王祥传 潘时龙 SUN Xiuyuan;WANG Hui;XU Zhongyang;FENG Lipeng;WANG Xiangchuan;PAN Shilong(Shanghai Institute of Satellite Engineering,Shanghai 201109,China;Key Laboratory of Radar Imaging and Microwave Photonics of Ministry of Education,College of Electronic and Information Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,Jiangsu,China)

机构地区：[1]上海卫星工程研究所,上海201109 [2]南京航空航天大学电子信息工程学院雷达成像与微波光子技术教育部重点实验室,江苏南京211106

出　　处：《上海航天（中英文）》2022年第2期60-65,共6页Aerospace Shanghai（Chinese&English）

基　　金：上海航天科技创新基金(SAST2018054);雷达成像与微波光子技术教育部重点实验室开放课题(RIMP2020001);国家自然科学基金(61527820,62075095)。

摘　　要：空间光载射频链路利用空间光链路实现射频信号的传输。由于采用大气信道传输光载射频信号,链路绝对延时受到大气湍流和温度等因素影响,产生延时抖动。本文采用相推法对1 km空间光载射频链路的绝对延时进行了高精度测量,测量结果与理论模型吻合,测量精度优于0.1 ps。该测量方法采用电光调制和射频鉴相实现了链路绝对延时测量,与光载射频链路具有良好的技术兼容性,同时较高的测量精度可以满足构建稳定光载射频传输链路的要求。The radio over free-space-optical(RoFSO) link uses a free-space-optical link to transmit radiofrequency(RF)signals through atmospheric channels. Owing to the effects of atmosphere turbulence and temperature,the time delay of the free-space-optical link suffers from timing jitter,which may degrade the performance of the RoFSO link. In this paper,the absolute time delay of a 1 km RoFSO link is precisely measured with a phase-derived method. The results are accord with the theoretical model,and the measured accuracy is higher than 0.1 ps. Owing to the use of electro-optic modulation and radio frequency(RF) phase discrimination,the measurement method is compatible with the RoFSO link,and the high accuracy can meet the requirements for a stable RoFSO link.

关 键 词：相推法 空间光载射频链路 大气信道 绝对延时 精密测量 

分 类 号：TN929.12[电子电信—通信与信息系统]