›› 2011, Vol. 31 ›› Issue (4): 48-53.doi: 10.3780/j.issn.1000-758X.2011.04.007

• 第二届中国卫星导航学术年会论文 • 上一篇    下一篇

基于四路信号处理的载波锁相环

高源, 李健, 刘峰   

  1. (北京理工大学信息与电子学院,北京 100081)
  • 收稿日期:2011-03-18 修回日期:2011-04-11 出版日期:2011-08-25 发布日期:2011-08-25
  • 作者简介:高 源 1986年生,2008年毕业于北京交通大学通信工程专业,现为北京理工大学信息与电子学院博士研究生。研究方向为导航信号处理。

Carrier Phase Lock Loop Based on Four-way Signal Processing

 GAO  Yuan, LI  Jian, LIU  Feng   

  1. (School of Information and Electronics, Beijing Institute of Technology, Beijing 100081)
  • Received:2011-03-18 Revised:2011-04-11 Online:2011-08-25 Published:2011-08-25

摘要: 载波跟踪环是独立导航接收机中最为脆弱的部分,在一定载噪比下,影响载波跟踪环跟踪门限的主要因素是动态应力。科斯塔斯锁相环是最常用的载波跟踪环之一,由于频率牵引范围的限制,其对动态应力非常敏感,该频率牵引范围由最大相位牵引范围决定。传统科斯塔斯锁相环是基于两路信号处理进行载波相位锁定的,其相位牵入范围仅为[-π/2,π/2]。文章提出了一种基于四路信号处理的科斯塔斯锁相环,增加的两路信号分别与原来两路相位相差π/4,其相位牵入范围可以达到[-3π/4,3π/4],较传统方式提高了1/2。仿真结果显示文中提出的设计方法能够明显提高环路的动态性能

关键词: 载波跟踪环, 科斯塔斯锁相环, 动态性能, 全球导航卫星系统接收机, 卫星

Abstract: Under a certain carrier noise ratio (CNR), the threshold of carrier tracking loop is mainly affected by the dynamic stress. Costas phase lock loop (PLL)is one of the most common carrier tracking loop, but it is too sensitive to the dynamic stress because of the limited frequency pull-in range. The frequency pull-in range of phase lock loop is determined by the maximum phase pull-in range. The phase pull-in range of classic Costas PLL based on two-way signal processing is just [-π/2, π/2], which is not good enough to track the carrier in dynamic environment. Therefore, a new four-way signal processing was proposed and applied into the Costas PLL, which can improve the phase pull-in range to [-3π/4, 3π/4]. In the proposed method, the π/4 and 3π/4 way signal processing were added to the classic Costas PLL to construct four-way signal processing. The simulation results show that the proposed four-way signal processing PLL can significantly improve the dynamic performance of the receiver.

Key words: Carrier tracking loop, Costas phase lock loop, Dynamic performance, Global navigation satellite system receiver, Satellite