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An Improved Adaptive Median Filtering Algorithm for Radar Image Co-Channel Interference Suppression.

Nuozhou Li1, Tong Liu1, Hangqi Li1

  • 1College of Navigation, Dalian Maritime University, Dalian 116026, China.

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Summary

This study introduces an improved adaptive median filtering algorithm to reduce marine radar co-channel interference, enhancing ocean monitoring accuracy. The new method effectively suppresses interference, outperforming standard adaptive median filtering.

Keywords:
adaptive median filtering algorithmbetween-class varianceco-channel interferencetangential interference ratio

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Area of Science:

  • Oceanography
  • Signal Processing
  • Radar Technology

Background:

  • Co-channel interference in marine radar systems degrades the accuracy of radar image parameter extraction.
  • Existing filtering methods struggle to effectively suppress this specific type of interference, impacting ocean monitoring capabilities.

Purpose of the Study:

  • To propose an improved adaptive median filtering algorithm for suppressing marine radar co-channel interference.
  • To enhance the accuracy of ocean monitoring by improving radar image parameter extraction.

Main Methods:

  • A tangential interference ratio model was constructed using an improved Laplace operator to quantify co-channel interference.
  • A threshold based on between-class variance was used to classify interference into high and low-ratio regions.
  • An improved adaptive median filter processed high-ratio regions using sub-window medians, while low-ratio regions used current window medians.

Main Results:

  • The proposed filtering algorithm demonstrated superior performance in suppressing co-channel interference compared to the standard adaptive median filtering algorithm.
  • Validation using radar-measured data from Bohai Bay confirmed the algorithm's effectiveness.

Conclusions:

  • The improved adaptive median filtering algorithm effectively suppresses marine radar co-channel interference.
  • This advancement leads to more accurate ocean monitoring and radar image parameter extraction.