An Efficient Refocusing Method for Ground Moving Targets in Multichannel SAR Imagery
Date
2024-08-02
Journal Title
Journal ISSN
Volume Title
Publisher
IEEE Geoscience and Remote Sensing Letters
Abstract
This letter proposes a fast Doppler parameter estimation and refocusing method for ground moving targets in a synthetic aperture radar (SAR) system. In the proposed method, after implementing the main-lobe clutter rejection by using the azimuth adaptive processing technique, the range-azimuth positions of smeared target scatterers can be obtained via the constant false alarm rate (CFAR) detection. Then, an autocorrelation function is constructed to transform a moving target signal into the time-frequency plane, where the target parameters can be precisely and efficiently estimated by applying the scaled fast Fourier transform (FFT). Finally, ground moving targets can be well refocused and relocated in a SAR imagery. Compared with the conventional methods, the target output SNR can be enlarged about 3 dB under the low SNR by using the proposed parameter estimation method.
Description
This article was originally published in IEEE Geoscience and Remote Sensing Letters. The version of record is available at: https://doi.org/10.1109/LGRS.2024.3437429.
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Keywords
doppler parameter estimation, ground moving target refocusing and relocation, synthetic aperture radar (SAR)
Citation
J. Ma, X. -G. Xia, J. Wang, H. Tao, G. Liao and P. Huang, "An Efficient Refocusing Method for Ground Moving Targets in Multichannel SAR Imagery," in IEEE Geoscience and Remote Sensing Letters, vol. 21, pp. 1-5, 2024, Art no. 4014105, doi: 10.1109/LGRS.2024.3437429.