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A Frequency-Domain Multipath Parameter Estimation and Mitigation Method for BOC-Modulated GNSS Signals.

Chao Sun1, Hongbo Zhao2, Wenquan Feng3

  • 1Electronic and information Engineering Department, Beihang University, 100191 Beijing, China. sunchao@buaa.edu.cn.

Sensors (Basel, Switzerland)
|March 3, 2018
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Summary
This summary is machine-generated.

This study introduces a new frequency-domain method for mitigating multipath errors in Global Navigation Satellite System (GNSS) signals, specifically for Binary Offset Carrier (BOC) modulation. The averaging-Fast Fourier Transform (averaging-FFT) approach offers robust performance in challenging environments with reduced computational demands.

Keywords:
binary offset carrier (BOC) modulationfrequency domain analysismultipath channelsparameter estimationsatellite navigation systems

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Area of Science:

  • Signal Processing
  • Satellite Navigation Systems
  • Error Mitigation Techniques

Background:

  • Multipath propagation is a primary error source in high-accuracy Global Navigation Satellite System (GNSS) applications.
  • Binary Offset Carrier (BOC) modulation offers enhanced performance but poses challenges for traditional multipath mitigation due to its complex autocorrelation function.
  • Existing non-parametric methods lack universal applicability, while parametric methods suffer from high computational complexity and noise sensitivity.

Purpose of the Study:

  • To develop a practical and efficient parametric multipath estimation method for BOC signals in the frequency domain.
  • To address the limitations of existing multipath mitigation techniques for BOC signals, particularly concerning computational load and noise vulnerability.
  • To enhance the accuracy and reliability of GNSS applications in environments prone to multipath interference.

Main Methods:

  • A novel parametric multipath estimation method operating in the frequency domain for BOC signals.
  • Utilizing frequency-domain transformation to isolate the multipath channel transfer function for parameter estimation.
  • Implementing segmentation and averaging techniques to mitigate noise and reduce computational complexity.

Main Results:

  • The proposed averaging-Fast Fourier Transform (averaging-FFT) method demonstrates good robustness in severe multipath environments.
  • The method achieves a lower computational load compared to existing techniques.
  • Effective multipath mitigation is shown for both low-order and high-order BOC signals.

Conclusions:

  • The developed frequency-domain parametric method provides an effective solution for multipath mitigation in BOC-based GNSS.
  • The averaging-FFT approach offers a practical balance between performance, robustness, and computational efficiency.
  • This technique enhances the reliability of high-accuracy GNSS applications facing multipath interference.