GNSS World of China

Volume 45 Issue 1
Feb.  2020
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LIU Xu, YAO Zheng, LYU Hongli, LU Mingquan. SIC-based anti near-far effect acquisition method for pseudolites systems[J]. GNSS World of China, 2020, 45(1): 12-18. doi: DOI:10.13442/j.gnss.1008-9268.2020.01.002
Citation: LIU Xu, YAO Zheng, LYU Hongli, LU Mingquan. SIC-based anti near-far effect acquisition method for pseudolites systems[J]. GNSS World of China, 2020, 45(1): 12-18. doi: DOI:10.13442/j.gnss.1008-9268.2020.01.002
shu

SIC-based anti near-far effect acquisition method for pseudolites systems

doi: DOI:10.13442/j.gnss.1008-9268.2020.01.002
  • 1.

    Department of Electronic Engineering, Tsinghua University,Beijing 100084, China

  • 2.

    Beijing National Research Center for Information Science and
    Technology, Beijing 100084, China

  • 3.

    Shaanxi Key Laboratory of Integrated and Intelligent Navigation, Xi′an 710068, China

  • The 20th Research Institute of China Electronics Technology Corporation, Xi′an 710068, China

  • Publish Date: 2020-02-15
    Abstract
  • In the Ground-based Pseudolites System, near-field pseudolite signals may interfere and suppress the far-field signals since the existence of near-far effect, causing failure acquisition of the far-field signals. A SIC-based acquisition method anti near-far effect is proposed in this paper, aiming at the acquisition of time-hopping direct sequence spread spectrum (TH-DSSS) signal implemented in this system. Interferences of strong signals to weak signals are reduced by reconstructing local replica of the strong signal and interference cancellation. The proposed method is analyzed in theory and simulation. Simulation results indicate that the SIC-based acquisition method has the ability to reduce the influence of near-far effect, increase the detection probability of weak signals and enlarge the operating range of system without changing the pseudolite base station structure and the framework of corresponding receiver, which provides an effective guarantee for the receiver to capture, track and position in scenarios with strong near-far effect.

     

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