星间链路通信收发一体化系统设计  

Design of Transceiver Integrated System for Inter-satellite Link Communication

作　　者：鲍爱达[1] 候世豪 郭鑫[1] 崔鹤[2] 张鑫哲 BAO Aida;HOU Shihao;GUO Xin;CUI He;ZHANG Xinzhe(State Key Laboratory of Dynamic Measurement Technology,North University of China,Taiyuan 030051,China;Space Star Technology Co.,Ltd.,Beijing 100095,China)

机构地区：[1]中北大学动态测试技术国家重点实验室,太原030051 [2]航天恒星科技有限公司,北京100095

出　　处：《计算机测量与控制》2024年第8期280-286,共7页Computer Measurement &Control

基　　金：国家自然科学基金资助项目(62204232);山西省基础研究计划资助项目(202103021244198)。

摘　　要：随着卫星制造发射成本的降低以及全球通信需求的增加,低轨星间链路技术成为研究热点;星间链路可将多颗卫星互联,建立具有导航和通信功能的自主运行系统,可靠的通信技术是当前的研究重点;为了适应外太空具有较大多普勒频移的高动态环境,设计了星间链路通信收发一体化系统;发射端采用UQPSK直接序列扩频技术,双通道架构可同时完成不同速率的导航与通信数据的发射,再运用LDPC编码技术提升数据发射速率与稳定性;接收端采用改进的PMF-FFT分段捕获算法与归一化最小和LDPC译码算法,以快速准确捕获星间信息;在FPGA硬件平台经过多次测试,该系统均可在高动态环境下,正确快速捕获到多普勒频移高达±341 kHz的信号,捕获算法时间均可保持在200 ms以内,符合实际应用中的性能需求。With the reduction of satellite manufacturing and launch costs and the increase in global communication needs,the low-orbit inter-satellite link technology has become a research hotspot.Inter-satellite link can interconnect multiple satellites to establish an autonomous operating system with navigation and communication functions,the reliable communication technology is currently a research focus.In order to meet the requirements of high dynamic environments with large Doppler frequency shift in outer space,an integrated inter-satellite link communication transceiver system is designed.The transmitter uses unbalanced quadrature phase shift keying(UQPSK) direct sequence spread spectrum technology,the dual-channel architecture can simultaneously complete the transmission of navigation and communication data at different rates,and then applies the low density parity check code(LDPC) encoding technology to improve the data transmission rate and stability;The receiving end uses an improved partial match filter-fast fourier transform(PMF-FFT) segmented acquisition algorithm and normalized minimum and LDPC decoding algorithm to quickly and accurately capture the inter-satellite information.After many tests on the FPGA hardware platform,the system can accurately and quickly capture signals with Doppler frequency shift up to ±341 kHz in highly dynamic environments.The capture time of the algorithm can be kept within 200 ms,which meets the performance requirements in practical applications.

关 键 词：星间链路 UQPSK直接序列扩频技术 PMF-FFT LDPC FPGA 

分 类 号：TN927.2[电子电信—通信与信息系统]