中国空间科学技术

中国空间科学技术 ›› 2023, Vol. 43 ›› Issue (2): 117-127.doi: 10.16708/j.cnki.1000-758X.2023.0026

• 论文 • 上一篇    下一篇

CSK调制信号的跟踪方法

严涛，田野，李天，王国永，王瑛，周泉，边朗   

  1. 中国空间技术研究院西安分院，西安710000
  • 出版日期:2023-04-25 发布日期:2023-03-13

Tracking method for code shift keying(CSK) modulated signal

YAN Tao，TIAN Ye，LI Tian，WANG Guoyong，WANG Ying，ZHOU Quan，BIAN Lang   

  1. China Academy of Space Technology(Xi′an),Xi′an 710000,China
  • Published:2023-04-25 Online:2023-03-13

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摘要： CSK调制信号能够满足GNSS厘米级高精度服务的高信息速率播发需求，正受到广泛关注。针对CSK调制信号只能用于播发数据，而不能用于提供测量观测量的问题，对CSK调制信号的跟踪方法进行了研究。通过权衡性能和实现复杂度，提出了两种跟踪方法，方法一跟踪精度高但实现复杂度高，方法二以损失跟踪精度为代价降低了实现复杂度。理论和仿真分析结果表明，所提方法一在CSK调制信号载噪比高于40dB-Hz时，可提供与BPSK信号相当的跟踪性能。方法二相比方法一所需相关器资源降低一半，性能损失约4dB。论文的研究成果可为CSK调制信号在GNSS高精度信号体制中的应用提供支持。

关键词: CSK调制信号, 高信息速率, 误符号率, 跟踪误差, 全球卫星导航系统

Abstract:  The code shift keying(CSK) modulated signal can support high data rate and meet the development needs for GNSS centimeter-level high-precision service.Thus,CSK modulated signal is attracting more and more attention.However,CSK modulated signal is usually only used in navigation message broadcast,but not ranging.To solve this problem,the tracking method for CSK modulated signal was studied,and two methods were proposed by tradeoff between performance and implementation complexity.Method one had high tracking accuracy with high implementation complexity,and method two reduced the implementation complexity at the cost of losing tracking accuracy.The tracking performance of the proposed methods was verified by theory and simulation.The results show that method one can provide the equivalent tracking performance to BPSK signal when C/N0 is higher than 40dB-Hz.Compared with method one,the required correlator resources by method two are reduced by 50%,but tracking performance of method two suffers 4dB degradation.The research results of this paper can provide a reference for the application of CSK modulated signal in GNSS high-precision signal design.

Key words: CSK modulated signal, high data rate, symbol error rate(SER), tracking error, global navigation satellite system(GNSS)