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A new approach for SAR baseband Doppler centroid estimation
Author(s): Bidan Liu; Chang Liu; Yanfei Wang
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Paper Abstract

In synthetic aperture radar (SAR), many of the biased baseband Doppler centroid estimates are caused by partial exposures of bright targets. To avoid this problem, this paper proposes a new estimation algorithm to remove the effects of partial exposures under non-homogeneous environment. This algorithm is implemented by three steps. Firstly, concentrate the energy of each target into a few pixels through azimuthal compression using frequency domain matched filter. Then, extract the homogeneous environment through the spectral distortion and contrast, and eliminate the strong interference target. Finally, estimate the centroid of the averaged extracted power spectrum using a circular convolution method. Theoretical analysis and experimental results show that the proposed method can effectively eliminate the interference targets and accurately find the Doppler centroid under non-homogeneous environment with strong interference. Moreover, the operations of the proposed algorithm need no iterations, thus the computational load is greatly reduced compared with the traditional iterative methods.

Paper Details

Date Published: 31 August 2018
PDF: 6 pages
Proc. SPIE 10835, Global Intelligence Industry Conference (GIIC 2018), 1083512 (31 August 2018); doi: 10.1117/12.2504204
Show Author Affiliations
Bidan Liu, Institute of Electronics, CAS (China)
Chang Liu, Institute of Electronics, CAS (China)
Yanfei Wang, Institute of Electronics, CAS (China)

Published in SPIE Proceedings Vol. 10835:
Global Intelligence Industry Conference (GIIC 2018)
Yueguang Lv, Editor(s)

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