Rapid Acquisition of Doppler Shift in Satellite Communications

HUANG Zhen; LU Jian-hua; YANG Shi-zhong

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Rapid Acquisition of Doppler Shift in Satellite Communications

更新时间：2025-07-16

- Rapid Acquisition of Doppler Shift in Satellite Communications
- Acta Electronica Sinica Vol. 31, Issue 7, Pages: 1052-1056(2003)
- 作者机构：
  
  1. 清华大学电子工程系,北京,100084
  2. 重庆大学通信工程学院,重庆,400044
  3. 清华大学电子工程系北京,100084
  4. 重庆大学通信工程学院重庆,400044
- 作者简介：
- 基金信息：
- DOI：
  CLC： TN92
- Published：2003
- 稿件说明：
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HUANG Zhen, LU Jian-hua, YANG Shi-zhong. Rapid Acquisition of Doppler Shift in Satellite Communications[J]. Acta Electronica Sinica, 2003, 31(7): 1052-1056.
DOI：

HUANG Zhen, LU Jian-hua, YANG Shi-zhong. Rapid Acquisition of Doppler Shift in Satellite Communications[J]. Acta Electronica Sinica, 2003, 31(7): 1052-1056. DOI：

摘要

本文提出了一种适用于低轨卫星扩频通信系统的多普勒频移快捕方法.该方法基于数字匹配滤波器及自动频率控制环路

利用数字匹配滤波器的PN码快捕特性及其输出主相关峰值对频偏的敏感性

缩短多普勒频移的捕获时间.论文首先推导了多普勒频移的平均捕获时间表达式

然后根据数值分析结果得到了准最佳捕获判决策略

最后通过比较验证了该快捕方法相对于传统串行捕获方法在性能上的提高.

Abstract

In this paper

a rapid acquisition scheme of Doppler shift is proposed for a LEO satellite spread-spectrum communications system.Based on the use of digital matched filter(DMF)and automatic frequency control(AFC)loop

two characteristics of the DMF are exploited to reduce the mean acquisition time (MAT)of Doppler shift

namely

the rapid acquisition property of PN code and a high sensitivity of maximum correlation value to frequency offset.An expression of the MAT is derived

and a suboptimal decision of acquisition is given out from numerical results.Finally

the performance of the proposed acquisition scheme is compared with the traditional serial scheme

showing a significant improvement achieved.

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