面向星间高动态链路的激光通信测距一体化技术  

Integrated Laser Communication Ranging Technology for Inter-satellite High Dynamic Links

作　　者：朱简尊 林玉洁 胡春源 ZHU Jian-zun;LIN Yu-jie;HU Chun-yuan(School of Information and Electronics,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]北京理工大学信息与电子学院,北京100081

出　　处：《中国电子科学研究院学报》2024年第7期598-605,614,共9页Journal of China Academy of Electronics and Information Technology

基　　金：国家自然科学基金资助项目(62001030)。

摘　　要：面向星间链路的激光通信测距一体化技术将高速通信与测距定位的功能相结合,可以有效缓解当前通信速率低、链路隐蔽性差、卫星载荷冗杂的问题。但相干体制下的星间激光链路易受多普勒频偏的影响,通信质量与测距精度急需提高。对此文中提出一种基于定时同步环路的精准测距与消除频偏的方法。通过定时同步环路,在星间距离为100 km~1500 km,符号速率为5GBaud条件下,有效提高测距精度到10-1mm。同时可以对星间链路中±125 kHz范围内的码多普勒频偏进行估计补偿,有效去除相干体制下多普勒频偏的干扰,最终实现提高测距精度与抗频偏能力的目的。The integration of laser communication and ranging technology for inter-satellite links merges high-speed communication capability with precise ranging and positioning function.This integration addresses challenges such as low communication rates,compromised link concealment,and excessive satellite payloads effectively.Nevertheless,the communication quality and ranging accuracy in the coherent inter-satellite laser link system are impacted by Doppler frequency bias.To counteract this issue,a method involving precise ranging and frequency bias correction based on the timing synchronization loop is proposed.This synchronization loop enhances the ranging accuracy up to 10-1 mm across the inter-satellite distances ranging from 100 km to 1500 km,and at the symbol rate of 5GBaud.It also enables the estimation and compensation of the code Doppler frequency bias within a±125 kHz range in the inter-satellite links.Consequently,this method effectively eliminates Doppler frequency bias interference in the coherent system,thereby improving both ranging accuracy and ability against frequency bias.

关 键 词：通信测距一体化 星间激光链路 定时同步 多普勒频偏 

分 类 号：TN929[电子电信—通信与信息系统]