J4 ›› 2015, Vol. 42 ›› Issue (5): 7-12+62.doi: 10.3969/j.issn.1001-2400.2015.05.002

• 研究论文 • 上一篇    下一篇



  1. (1. 西安电子科技大学 综合业务网理论及关键技术国家重点实验室,陕西 西安  710071;
    2. 中国空间技术研究院西安分院,陕西 西安  710100)
  • 收稿日期:2014-08-10 出版日期:2015-10-20 发布日期:2015-12-03
  • 通讯作者: 同钊
  • 作者简介:同钊(1989-), 女, 西安电子科技大学博士研究生, E-mail: loki_tong@126.com.
  • 基金资助:


Design of the discriminator for tracking the loop under short-delay multipath interference

TONG Zhao1;LI Bingbing1;HUI Yongtao1;ZHONG Xingwang2;LIU Hao1   

  1. (1. State Key Lab. of Integrated Service Networks, Xidian Univ., Xi'an  710071, China;
    2. CAST-Xi'an Institute of Space Radio Technology, Xi'an  710100, China)
  • Received:2014-08-10 Online:2015-10-20 Published:2015-12-03
  • Contact: TONG Zhao



关键词: 码跟踪环路, 鉴别器, 多径, 跟踪测量精度


The traditional multipath eliminating methods have poor performance under short-delay multipath interference and therefore a discriminator constructing method for tracking the loop is presented. Firstly, from the analysis of the output characteristics for in-phase/quadrature-phase early, late, and prompt channels under the short-delay multipath, an improved late channel is constructed. The output of the loop discriminator is defined as the normalized function of the power difference between early and late signals. It made the error between the code phase of the direct signal and that of the local estimated signal is less than the pre-determined threshold. Theoretical analysis and simulation results show that, compared to traditional methods, the multipath mitigation technique based on the improved loop discriminator can suppress the code tracking errors produced by the multipath when the relative delay is less than 0.5 chip and effectively inhibits short-delay multipath interference, thus improving the tracking and measurement accuracy in navigation and docking systems.

Key words: code tracking loop, discriminator, multipath, accuracy of tracking and measurement