物联网学报2024，Vol.8Issue(2)：36-45,10.DOI:10.11959/j.issn.2096-3750.2024.00371
空间通信载波多普勒频偏捕获的两阶段稀疏算法
Two-stage-sparse algorithm for carrier Doppler-shift acquisition in space communications
摘要
Abstract
In space communications,the signal faces long-distance transmission and a high-dynamic relative movement.The long-distance transmission results in a very low signal-to-noise ratio(SNR)and the high-dynamic relative movement causes a high-dynamic Doppler-shift on the carrier.To address the low SNR,the traditional acquisition method requires the long-time accumulation of many received signals.However,during the long-time accumulation,the high-dynamic Doppler-shift causes the serious energy dispersion problem.To solve the problem,a two-stage-sparse(TSS)algorithm was proposed to acquire the Doppler-shift.The proposed TSS algorithm firstly used the coarse acquisitions to construct a coarse sparse-search-range,then selected some large elements to construct a fine sparse-search-range,and finally searched the largest element as the acquisition result.Because the sparse-search-range only covers a narrow frequency range,the TSS algorithm excludes more noise elements,thus allowing the signal element to become the largest element.The theoretical analysis and simulation results show that the proposed TSS algorithm significantly increases the acquisition probability.关键词
空间通信/低信噪比/高动态多普勒频偏/捕获/能量扩散Key words
space communication/low SNR/high-dynamic Doppler-shift/acquisition/energy dispersion分类
信息技术与安全科学引用本文复制引用
张兆维,刘琳,刘慧,吴同,朱明蕾,潘甦..空间通信载波多普勒频偏捕获的两阶段稀疏算法[J].物联网学报,2024,8(2):36-45,10.基金项目
国家自然科学基金项目(No.61801236) （No.61801236）
江苏省研究生科研与实践创新计划项目(No.SJCX23_0288) （No.SJCX23_0288）
南京大学计算机软件新技术全国重点实验室资助项目(No.KFKT2024B41) The National Natural Science Foundation of China(No.61801236),The Postgraduate Research and Practice Innovation Program of Jiangsu Province(No.SJCX23_0288),The Foundation of State Key Laboratory for Novel Software Technol-ogy(No.KFKT2024B41) （No.KFKT2024B41）
