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Journal of Projectiles, Rockets, Missiles and Guidance >

2021 , Vol. 41 >Issue 2: 137 - 140

DOI: https://doi.org/10.15892/j.cnki.djzdxb.2021.02.028

Research on Frame Synchronization Method of CNAV-2 Message in GPS L1C Signal

  • LI Xinhao ,
  • ZENG Fangling ,
  • DONG Tianbao
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  • College of Electronic Countermeasure,National University of Defense Technology,Hefei 230037,China

Received date: 2020-06-29

  Online published: 2025-02-25

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Abstract

In order to solve the problem of frame synchronization of CNAV-2 message in GPS L1C signal, an algorithm for frame synchronization based on multi-fractal spectrum is proposed. Based on the fixed length splitting of the synchronization sequence, the coarse synchronization of the message data is realized by calculating the multifractal spectrum width distribution of each split sequence. According to the structure characteristics of the message data and the known condition of BCH code word, the coarse synchronization sequence is matched and the accurate synchronization of the message data is finally realized. Simulation results show that, under the condition of high bit error rate, the multifractal spectrum width of the split sequence still has periodic peak distribution, which shows that the algorithm has good error resistance performance.

Key words： CNAV-2 message; frame synchronization; bias; multi-fractal spectrum

Cite this article

LI Xinhao , ZENG Fangling , DONG Tianbao . Research on Frame Synchronization Method of CNAV-2 Message in GPS L1C Signal[J]. Journal of Projectiles, Rockets, Missiles and Guidance, 2021 , 41(2) : 137 -140 . DOI: 10.15892/j.cnki.djzdxb.2021.02.028

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