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中南大学学报(自然科学版)

Journal of Central South University

第46卷    第6期    总第250期    2015年6月

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文章编号:1672-7207(2015)06-2134-08
GNSS信号捕获中的伪码多普勒补偿技术
黄新明,龚航,朱祥维,欧钢

(国防科技大学 电子科学与工程学院,湖南 长沙,410073)

摘 要: 针对全球导航卫星系统(GNSS)信号捕获中存在伪码多普勒,提出一种基于时延控制的伪码多普勒补偿方法,通过数字延迟滤波器补偿由于伪码多普勒引入的本地码和接收信号的相位不匹配。给出包括码多普勒补偿在内的新的GNSS信号捕获结构,并对全球定位系统(GPS)C/A码信号进行仿真验证。研究结果表明:延迟滤波器阶数越大,码多普勒的补偿效果越好;在采样率为5 MHz时,采用三阶Farrow结构的分数阶延迟滤波器捕获损耗降低至0.2 dB。

 

关键字: 全球导航卫星系统;伪码多普勒补偿;时延控制;可变分数阶延迟滤波器

Code Doppler compensation method for GNSS signal acquisition
HUANG Xinming, GONG Hang, ZHU Xiangwei, OU Gang

School of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China

Abstract:A code Doppler compensation method based on delay control was proposed to remove the influence of loss in acquisition performance because of code Doppler during global navigation satellite systems (GNSS) signal acquisition. Compensation of code Doppler was achieved by compensating the phase difference between the received and local signals with a digital delay filter. A new GNSS signal acquisition structure, including code Doppler compensation processing, was provided. Performance of the compensation method was analyzed and verified by simulation. The results show that the higher the order of the digital delay filter, the better the compensation performance. Moreover, detection loss can be reduced to less than 0.2dB with a 3th-order fractional delay filter realized by FARROW structure.

 

Key words: global navigation satellite system (GNSS); code Doppler compensation; delay control; variable fractional delay filter

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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