Frequency Tracking and Synchronization Strategy for Low Earth Orbit Satellites Based on Compensation and Prediction

DUAN Xianglong; LIU Liu; SU Zhaoyang; CAI Yuchen; GAO Yibo; YIN Yi; NING Lipeng

doi:10.11959/j.issn.1000-0801.2025020

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Frequency Tracking and Synchronization Strategy for Low Earth Orbit Satellites Based on Compensation and Prediction

Studies | 更新时间：2025-07-04

- Frequency Tracking and Synchronization Strategy for Low Earth Orbit Satellites Based on Compensation and Prediction
- Space-Integrated-Ground Information Networks Vol. 6, Issue 2, Pages: 76-86(2025)
- 作者机构：
  
  1.北京交通大学，北京100044
  2.中国国家铁路集团有限公司，北京100844
- 作者简介：
- 基金信息：
  
  The National Natural Science Foundation of China(62341102;62221001)
- DOI：10.11959/j.issn.1000-0801.2025020
  CLC： TN927.2
- Received：11 January 2025，
  
  Revised：2025-05-30，
  
  Published：20 June 2025
- 稿件说明：
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段相龙,刘留,苏昭阳等.基于补偿和预测的低轨卫星频率同步方法[J].天地一体化信息网络,2025,06(02):76-86.

DUAN Xianglong,LIU Liu,SU Zhaoyang,et al.Frequency Tracking and Synchronization Strategy for Low Earth Orbit Satellites Based on Compensation and Prediction[J].Space-Integrated-Ground Information Networks,2025,06(02):76-86.
段相龙,刘留,苏昭阳等.基于补偿和预测的低轨卫星频率同步方法[J].天地一体化信息网络,2025,06(02):76-86. DOI： 10.11959/j.issn.1000-0801.2025020.

DUAN Xianglong,LIU Liu,SU Zhaoyang,et al.Frequency Tracking and Synchronization Strategy for Low Earth Orbit Satellites Based on Compensation and Prediction[J].Space-Integrated-Ground Information Networks,2025,06(02):76-86. DOI： 10.11959/j.issn.1000-0801.2025020.

摘要

低轨（LEO）卫星网络作为地面网络的重要补充，是天地一体化融合网络的重要组成部分。LEO卫星的高移动速度造成了大多普勒频偏与其变化率，因此需要新的低轨卫星背景下的初始接入和链路跟踪过程中的频偏估计策略。基于该场景，首先介绍频率同步的相关信号，并针对LEO卫星的特点，提出基于补偿的初始接入和基于PTRS信号的频率跟踪策略。通过仿真验证了所提方案的有效性，该方案为LEO卫星通信系统的设计提供了参考。

Abstract

As an important supplement to the ground network

the low earth orbit (LEO) satellite network is an important component of the integrated network of space and earth. Due to the high moving speed of LEO satellites

a large Doppler frequency offset and its rate of change are caused

so a new frequency offset estimation strategy is needed in the initial access and link tracking process under the background of low earth orbit satellites. Based on this scenario

this paper first introduces the related signals of frequency synchronization

and proposes a compensation-based initial access and a PTRS signal-based frequency tracking strategy based on the characteristics of LEO satellites. The effectiveness of the proposed scheme is verified through simulation

this scheme provides a reference for the design of LEO satellite communication system.

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references

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