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Coherent Integration Method Based on Radon-NUFFT for Moving Target Detection Using Frequency Agile Radar.

Jiameng Pan1, Qian Zhu1, Qinglong Bao1

  • 1National Key Laboratory of Science and Technology on ATR, National University of Defense Technology, Changsha 410073, China.

Sensors (Basel, Switzerland)
|April 16, 2020
PubMed
Summary

This study introduces a fast coherent integration method for frequency agile (FA) radar moving target detection. The novel Radon-NUFFT approach accurately addresses range cell migration and phase fluctuations for improved detection performance.

Keywords:
coherent integrationfrequency agile radarmoving target detectionnonuniform fast Fourier transform

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Area of Science:

  • Radar signal processing
  • Electromagnetic wave theory
  • Target detection

Background:

  • Moving target detection in Frequency Agile (FA) radar faces challenges from Range Cell Migration (RCM) and non-uniform phase fluctuations.
  • These fluctuations arise from Range-Agile Frequency (R-AF) and Velocity-Time-Agile Frequency (V-T-AF) coupling, complicating coherent integration.
  • Existing methods struggle with the accuracy and speed required for complex FA radar scenarios.

Purpose of the Study:

  • To develop a fast and accurate coherent integration method for moving target detection in FA radar.
  • To effectively address the challenges posed by RCM and non-uniform phase fluctuations caused by R-AF and V-T-AF coupling.
  • To improve the performance of FA radar systems in complex target environments.

Main Methods:

  • A novel Radon-NUFFT method is proposed, combining Radon Fourier Transform (RFT) and Non-Uniform Fast Fourier Transform (NUFFT) with low-rank approximation.
  • RCM is resolved using the Radon algorithm through target trajectory searching.
  • Non-uniform phase fluctuations from R-AF coupling are compensated with a dedicated item, while V-T-AF coupling issues are addressed by treating them as a non-uniform spectral analysis problem solved by NUFFT.

Main Results:

  • The proposed Radon-NUFFT method accurately compensates for RCM and non-uniform phase fluctuations.
  • The method effectively handles phase fluctuations caused by both R-AF and V-T-AF coupling.
  • Simulation experiments validate the effectiveness and speed of the proposed coherent integration technique.

Conclusions:

  • The Radon-NUFFT method offers a significant advancement in coherent integration for FA radar.
  • This technique enables accurate and rapid moving target detection, outperforming existing methods.
  • The findings have practical implications for enhancing the capabilities of FA radar systems.