一种适用于弱信号的混合差分位同步算法

doi:10.3969/j.issn.1001-2400.2016.03.016

西安电子科技大学学报 ›› 2016, Vol. 43 ›› Issue (3): 90-94+154.doi: 10.3969/j.issn.1001-2400.2016.03.016

一种适用于弱信号的混合差分位同步算法

路卫军1;雷登云2;于敦山2

(1. 北京邮电大学电子工程学院，北京 100876;
2. 北京大学信息科学技术学院，北京 100871)

收稿日期:2015-05-11 出版日期:2016-06-20 发布日期:2016-07-16
通讯作者: 路卫军
作者简介:路卫军(1980- )，男，讲师，E-mail：luwj@bupt.edu.cn．
基金资助:
国家自然科学基金青年科学基金资助项目(61401039)；北京市科技计划资助项目(Z101104055810006)

Hybrid differential coherent bit synchronization algorithm for the weak GNSS signal

LU Weijun1;LEI Dengyun2;YU Dunshan2

(1. School of Electronics Engineering, Beijing Univ. of Posts and Telecommunication, Beijing 100876, China;
2. School of Electronic Engineering and Computer Science, Peking Univ., Beijing 100871, China)

Received:2015-05-11 Online:2016-06-20 Published:2016-07-16
Contact: LU Weijun

摘要/Abstract

摘要：

在弱信号条件下，导航信号跟踪频率偏差大，针对传统位同步算法同步增益低，位同步时间长的缺陷，提出了一种混合差分位同步算法．该算法采用短的相干累加方法，提高了信号的相干增益；同时，利用远距离差分方法，提高了位边界的识别概率，从而提高了位同步算法的增益．实验结果表明，该算法保持了良好的频率偏差容限，在50Hz的频率偏差范围内具备良好的同步性能．相较于传统的差分位同步算法，该算法的同步增益提高了3～7dB．

关键词: 差分相干, 位同步, 低信噪比, 全球卫星导航系统, 接收机

Abstract:

The low signal-to-carrier ratio and frequency deviation affect the bit synchronization in the GNSS receiver. In this paper, a hybrid differential coherent bit synchronization algorithm is presented, which uses the short coherent time to improve the signal gain and adopts the large distance differential coherent method to enhance the discrimination between bit edge and others. The results show that the proposed algorithm maintains a good frequency deviation tolerance, and achieves good synchronization performance under 50Hz frequency deviation. Compared with previous methods, the proposed algorithm improves the sensitivity of bit synchronization by 3～7dB.

Key words: differential coherent, bit synchronization, low signal to noise ratio, GPS, signal receivers

中图分类号:

TN967.1

路卫军;雷登云;于敦山. 一种适用于弱信号的混合差分位同步算法[J]. 西安电子科技大学学报, 2016, 43(3): 90-94+154.

LU Weijun;LEI Dengyun;YU Dunshan. Hybrid differential coherent bit synchronization algorithm for the weak GNSS signal[J]. Journal of Xidian University, 2016, 43(3): 90-94+154.

参考文献

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一种适用于弱信号的混合差分位同步算法

Hybrid differential coherent bit synchronization algorithm for the weak GNSS signal

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