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An Improved Time-Frequency Analysis Method in Interference Detection for GNSS Receivers.

Kewen Sun1, Tian Jin2, Dongkai Yang3

  • 1School of Computer and Information, Hefei University of Technology, Tunxi Road 193, Hefei 230009, China. kewen.sun@hfut.edu.cn.

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Summary
This summary is machine-generated.

This study introduces an improved time-frequency analysis for Global Navigation Satellite System (GNSS) receivers, enhancing interference detection. The method effectively overcomes signal cross-terms and improves localization for better performance in jamming environments.

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Area of Science:

  • Signal Processing
  • Navigation Systems

Background:

  • Global Navigation Satellite System (GNSS) receivers are susceptible to interference, degrading performance.
  • Existing interference detection methods struggle with signal cross-terms and time-frequency localization.
  • Accurate interference detection is crucial for reliable GNSS operation, especially in challenging environments.

Purpose of the Study:

  • To propose an improved joint time-frequency (TF) analysis method for enhanced interference detection in GNSS receivers.
  • To address the limitations of existing methods, specifically the cross-terms and TF concentration issues.

Main Methods:

  • The proposed method utilizes a reassigned smoothed pseudo Wigner-Ville distribution (RSPWVD).
  • A 2D low-pass filtering smoothing function is employed to mitigate cross-terms in the TF distribution.
  • The reassignment method is applied to enhance the TF concentration of signal auto-terms.

Main Results:

  • Experimental evaluation on GPS L1 signals in disturbing scenarios demonstrates superior performance compared to state-of-the-art approaches.
  • The RSPWVD method effectively eliminates cross-terms, preserving crucial time-frequency localization properties.
  • The technique shows significant improvements in interference detection accuracy and robustness.

Conclusions:

  • The proposed RSPWVD-based interference detection technique is effective and valid for GNSS receivers.
  • It enhances overall interference detection performance, particularly in jamming environments.
  • This method offers a robust solution for improving the reliability of satellite navigation systems.