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A Novel GNSS Interference Detection Method Based on Smoothed Pseudo-Wigner-Hough Transform.

Kewen Sun1,2, Baoguo Yu1, Mireille Elhajj3

  • 1State Key Laboratory of Satellite Navigation System and Equipment Technology, Zhongshan West Road 589, Shijiazhuang 050081, China.

Sensors (Basel, Switzerland)
|July 2, 2021
PubMed
Summary

Novel Global Navigation Satellite System (GNSS) interference detection methods using Hough transforms improve performance. The smoothed pseudo-Wigner-Hough transform offers superior detection, especially in challenging environments.

Keywords:
Hough transform (HT)cross-terminterference detectionsmoothed pseudo-Wigner–Hough transform (SPWHT)time-frequency (TF) analysis

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Area of Science:

  • Signal Processing
  • Navigation Systems
  • Electromagnetics

Background:

  • Global Navigation Satellite Systems (GNSS) are susceptible to interference, degrading positioning accuracy.
  • Existing interference detection methods often struggle with complex signal environments and cross-term interference.
  • Time-Frequency distributions are crucial for analyzing non-stationary signals like GNSS interference.

Purpose of the Study:

  • To develop novel GNSS interference detection methods utilizing the Hough transform.
  • To enhance the robustness and accuracy of interference detection in GNSS receivers.
  • To evaluate the performance of new methods against existing techniques, particularly concerning cross-term suppression.

Main Methods:

  • Integration of the Hough transform with Wigner-Ville, pseudo-Wigner-Ville, and smoothed pseudo-Wigner-Ville distributions.
  • Development of Wigner-Hough, pseudo-Wigner-Hough, and smoothed pseudo-Wigner-Hough transforms for interference detection.
  • Application of a novel zero Hough-transformed energy distribution percentage metric for performance analysis.
  • Testing with real GPS L1-C/A data contaminated with sweep interference.

Main Results:

  • The developed methods effectively detect GNSS interference, addressing the cross-term problem.
  • The smoothed pseudo-Wigner-Hough transform method demonstrated at least double the performance of the Wigner-Hough transform approach.
  • The smoothed pseudo-Wigner-Hough transform method showed a 20% improvement in zero Hough-transformed energy percentage criteria over the pseudo-Wigner-Hough transform method.

Conclusions:

  • The proposed smoothed pseudo-Wigner-Hough transform-based method is highly effective for GNSS interference detection.
  • This method offers significant improvements in detection performance and cross-term suppression.
  • It is particularly recommended for GNSS receivers operating in challenging electromagnetic environments.