无线电工程2024，Vol.54Issue(10)：2488-2493,6.DOI:10.3969/j.issn.1003-3106.2024.10.024
低轨卫星短突发通信时频同步算法
Time-Frequency Synchronization Algorithm for Short Burst Communication of LEO Satellite
张庆业 1王力男 1贾慧燕 2李燕 3卢向雨1
作者信息
- 1. 中国电子科技集团公司第五十四研究所,河北石家庄 050081
- 2. 航天系统部装备部军事代表局驻石家庄军事代表室,河北石家庄 050081
- 3. 武警工程大学信息工程学院,陕西西安 710086
- 折叠
摘要
Abstract
Short burst communication of low earth orbit satellite is characterized by significant Doppler frequency offset and Doppler rate variation,short burst symbols,and limited burst signal pilot length.Traditional time-frequency synchronization algorithms perform poorly under low signal to noise ratio conditions.In order to improve the performance of time synchronization and frequency offset estimation,and to accurately complete the synchronization process,a new time-frequency synchronization algorithm based on Time Division Multiple Access(TDMA)frame structure is proposed.This algorithm first utilizes a two-dimensional search algorithm for integer multiple delay estimation and coarse frequency offset estimation.After compensating for large frequency offsets and integer multiple delays,it estimates fractional multiple delays.Finally,it employs an Fast Fourier Transform(FFT)algorithm combined with low-pass filtering for fine frequency offset estimation.Simulation results show that with Es/N0=4.5 dB,the probability accuracy of delay detection reaches 99.99％,and the overall demodulation performance is improved by more than 2 dB compared to algorithms like M&M.关键词
低轨卫星/短突发通信/时分多址/时频同步Key words
low earth orbit satellite/short burst communication/TDMA/time-frequency synchronization分类
信息技术与安全科学引用本文复制引用
张庆业,王力男,贾慧燕,李燕,卢向雨..低轨卫星短突发通信时频同步算法[J].无线电工程,2024,54(10):2488-2493,6.
