空间激光通信与测距一体化研究  

Research on the Integration of Space Laser Communication and Ranging

作　　者：王熹[1,2] 邓磊 陶坤宇[3] 付森 杨奇 戴潇潇[1,7] 曹哲玮 沈勤 刘陈 付松年[5,6] WANG Xi;DENG Lei;TAO Kunyu;FU Sen;YANG Qi;DAI Xiaoxiao;CAO Zhewei;SHEN Qin;LIU Chen;FU Songnian(School of Optical and Electronic Information,HUST,Wuhan 430074,China;National Key Laboratory of Optical Communication Technologies and Networks,China Information Communication Technologies Group Corporation,Wuhan 430074,China;Shanghai Radio Equipment Research Institute,Shanghai 201109,China;Shanghai Research Institute of Aerospace Technology,Shanghai 201109,China;School of Information Engineering,Guangdong University of Technology,Guangzhou 510006,China;Guangdong Provincial Key Laboratory of Information Photonics Technology,Guangzhou 510006,China;Research Institute of Huazhong University of Science and Technology in Shenzhen,Shenzhen 518000,China)

机构地区：[1]华中科技大学光电信息学院,武汉430074 [2]中国信息通信科技集团有限公司光通信技术和网络全国重点实验室,武汉430074 [3]上海无线电设备研究所,上海201109 [4]上海航天技术研究院,上海201109 [5]广东工业大学信息工程学院,广州510006 [6]广东省信息光子技术重点实验室,广州510006 [7]华中科技大学深圳研究院,深圳518000

出　　处：《光通信研究》2024年第3期23-30,共8页Study on Optical Communications

基　　金：重点研发计划资助项目(2018YFB1801303);深圳市基础研究专项资助项目(JCYJ20200109142010888);深圳市协同创新专项资助项目(GJHZ20210705142539008)。

摘　　要：【目的】随着卫星技术和通信技术的不断提高,空间激光通信与测距一体化技术也逐渐成熟。而伴随着深空探测、卫星导航等领域的进一步发展,大量的业务及应用需求对星间的通信容量和测距精度又提出了更高的要求。在综合考虑卫星荷载与功耗的前提下,如何在实现激光卫星高速通信的同时,完成测距并进一步提升测距精度,成为亟待解决的课题。【方法】基于双向单程测距原理,设计并实现了一种同时支持正交相移键控(QPSK)和二进制相移键控(BPSK)的相干通信与测距一体化系统,为进一步提升测距性能,又从提升时钟精度入手,通过使用差拍采样方法,使用鉴频与鉴相来获取发送时钟与接收时钟之间的频率差与相位差,以此来获取到更高的时钟精度,从而对测距值进行校正。【结果】该系统能稳定工作在接收光功率大于-48 dBm的环境,针对不同应用需求可设置不同的速率,QPSK模式下最高速率为5 Gbit/s,BPSK模式下速率分别为2.5 Gbit/s、1.25 Gbit/s和625 Mbit/s,系统测距精度理论上可达最小值53 ps,在正常通信时,使用Matlab与Vivado对测距数据进行计算处理,验证了系统测距精度小于0.1 ns。进一步采用差拍采样方法,仿真条件下,测距精度可提升至码元宽度的10^(-3)量级,达±0.36 cm。【结论】所提通信测距一体化系统能够在高速通信的同时实现高精度测距,对未来激光卫星的相关应用具有一定的实际意义。【Objective】With the continuous advancements in satellite and communication technologies,the integration of space la ser communication and ranging technology becomes more mature.As deep space exploration,satellite navigation,and other fields continue to develop,there is a growing demand for higher communication capacity and ranging accuracy between satellites.Thus,the need to achieve laser satellite high⁃speed communication while completing ranging and further improving ranging accuracy,un der the premise of considering satellite payload and power consumption,has become an urgent issue.【Methods】This article de signs and implements a coherent communication and ranging integrated system that supports both QPSK and BPSK,based on the principle of dual one way ranging.To further improve the ranging performance,the differential time sampling method is used to obtain the frequency difference and phase difference between the sending clock and the receiving clock through frequency and phase discrimination,thereby achieving higher clock accuracy and correcting the ranging value.【Results】The system can operate stably in an environment where the received optical power is greater than-48 dBm.Different rates can be set for different application requirements,with a maximum rate of 5 Gbit/s in QPSK mode and rates of 2.5 Gbit/s,1.25 Gbit/s,and 625 Mbit/s in BPSK mode.The theoretical ranging accuracy of the system can reach a minimum of 53 ps.In normal communication,using Matlab and Vivado to calculate and process ranging data,the ranging accuracy of the system is verified to be less than 0.1 ns.Furthermore,using the differential time sampling method under simulation conditions,the ranging accuracy can be improved to the order of 10^(-3)of the symbol width,reaching±0.36 cm.【Conclusion】The proposed communication and ranging integrated system can achieve high⁃precision ranging while achieving high⁃speed communication,which is of practical significance for future applications of laser satellites.

关 键 词：卫星 激光通信 激光测距 高精度 一体化 

分 类 号：TN929.1[电子电信—通信与信息系统]