Improved non-coherent accumulation GNSS weak signal frequency tracking approach

Hang Ruan, Feng Liu*, Lei Zhang, Teng Long

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

In order to realize high sensitivity GNSS (global navigation satellite system) signal tracking in the environment of weak signal, an improved non-coherent GNSS signal frequency locking method was proposed, which solved the problem of navigation inversion to expand the available range of power accumulation length and increase the signal to noise ratio. A frequency space calculation method was designed based on accumulated nonlinear weighing error to gain the optimum linear non-coherent discriminator which has the largest linear frequency discrimination range. By extending the coherent and non-coherent accumulation, a high sensitivity frequency lock loop with a wide linear frequency discrimination range was realized, which could be applied to improve sensitivity. After the theoretic analysis and Monte Carlo simulation of the noise affection and the frequency convergence range, it is claimed that the frequency tracking sensitivity is improved and the signal with power of -160 dBm can be steadily tracked without navigation estimation and with a certain accuracy.

Original languageEnglish
Pages (from-to)122-127
Number of pages6
JournalHuazhong Keji Daxue Xuebao (Ziran Kexue Ban)/Journal of Huazhong University of Science and Technology (Natural Science Edition)
Volume42
Issue number5
DOIs
Publication statusPublished - 2014

Keywords

  • Frequency lock loop (FLL)
  • Non-coherent accumulation
  • Nonlinear error
  • Normalization
  • Weak signal

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