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Acta Aeronautica et Astronautica Sinica ›› 2025, Vol. 46 ›› Issue (1): 330502.doi: 10.7527/S1000-6893.2024.30502

• Electronics and Electrical Engineering and Control • Previous Articles     Next Articles

High resolution imaging of moving targets based on ALPFT parameter estimation

Jing HE, Gewei TAN()   

  1. College of Information Science and Engineering,Huaqiao University,Xiamen 361021,China
  • Received:2024-04-10 Revised:2024-05-06 Accepted:2024-06-21 Online:2025-01-15 Published:2024-07-08
  • Contact: Gewei TAN E-mail:tangewei70@163.com
  • Supported by:
    Huaqiao University Talent Program(10BS312)

Abstract:

In this paper, the problem of parameter estimation and imaging of ground moving targets with constant acceleration for Frequency Modulated Continuous Wave Synthetic Aperture Radar (FMCW SAR) is studied. Firstly, the echo model of moving targets in the FMCW SAR system is established, and the Adaptive Local Polynomial Fourier Transform (ALPFT) is proposed to estimate the Doppler phase of echoes up to the fourth order. Secondly, the range migration terms are corrected by generalized Keystone transform and Hough transform, and the velocity information of moving targets is estimated at the same time. Finally, by compensating for the high-order Doppler phases and performing the azimuth resampling of non-central moving targets, all moving objects in the scene can be focused well. Simulation results verify the feasibility and effectiveness of the proposed method.

Key words: Frequency Modulated Continuous Wave Synthetic Aperture Radar (FMCW SAR), parameter estimation of moving targets with constant acceleration, Adaptive Local Polynomial Fourier Transform (ALPFT), generalized Keystone transform, Hough transform, azimuth resampling

CLC Number: