一种北斗GEO卫星弱信号捕获方法

中国民航大学学报 ›› 2023, Vol. 41 ›› Issue (3): 19-24.

一种北斗GEO卫星弱信号捕获方法

吕自鹏，张建军，吕琳，韩明，邓琪

（天津七一二通信广播股份有限公司，天津300462）

收稿日期:2021-10-20 修回日期:2022-01-12 出版日期:2023-06-27 发布日期:2023-10-27
作者简介:吕自鹏（1991—），男，河北邯郸人，工程师，硕士，研究方向为卫星导航信号处理.

A weak signal acquisition method for BeiDou GEO satellite

LYU Zipeng, ZHANG Jianjun, LYU Lin, HAN Ming, DENG Qi

( TianJin 712 Communication & Broadcasting Co., Ltd., Tianjin 300462, China )

Received:2021-10-20 Revised:2022-01-12 Online:2023-06-27 Published:2023-10-27

摘要/Abstract

摘要： 北斗地球静止轨道（GEO，geostationaryearthorbit）卫星播发的D2导航数据每2ms就可能跳变一次，在弱信号环境下，通常的捕获算法无法有效捕获到信号，针对该问题提出一种基于导航数据估计的弱信号捕获方法。该方法可根据信号质量调整捕获策略，通过对导航数据快速准确地估计，减小了导航数据跳变对捕获灵敏度的影响。仿真结果表明，对长度为60ms、信噪比为-34dB的北斗GEO卫星信号，该方法捕获成功率为80%，且捕获时间与全比特法相当

关键词: font-size:15.04px, ">北斗卫星导航系统, 弱信号捕获, 相干积分, 软件接收机

Abstract:

The D2 navigation data broadcast by the BeiDou geostationary earth orbit (GEO) satellite may change every 2 ms.In weak signal environment, the usual acquisition algorithm cannot effectively capture the signal. To solve this problem, a weak signal acquisition method based on navigation data estimation is proposed. The capture strategy of this method can be adjusted according to the signal quality, by quickly and accurately estimating the navigation data, thus the impact of navigation data jump on capture sensitivity is reduced. The simulation results show that, for the BeiDou GEO signal with length of 60 ms and signal-to-noise ratio of -34 dB, the acquisition success rate of this method is 80%, and the acquisition time is equivalent to that of the full-bit method.

Key words: font-size:15.04px, ">Beidou Navigation Satellite System(BDS), weak signal acquisition, coherent integration, software receiver

中图分类号:

吕自鹏, 张建军, 吕琳, 韩明, 邓琪. 一种北斗GEO卫星弱信号捕获方法[J]. 中国民航大学学报, 2023, 41(3): 19-24.

LYU Zipeng, ZHANG Jianjun, LYU Lin, HAN Ming, DENG Qi. A weak signal acquisition method for BeiDou GEO satellite[J]. Journal of Civil Aviation University of China, 2023, 41(3): 19-24.

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