A new approach for SAR baseband Doppler centroid estimation

Bidan Liu; Chang Liu; Yanfei Wang

doi:10.1117/12.2504204

31 August 2018 A new approach for SAR baseband Doppler centroid estimation

Bidan Liu, Chang Liu, Yanfei Wang

Proceedings Volume 10835, Global Intelligence Industry Conference (GIIC 2018); 1083512 (2018) https://doi.org/10.1117/12.2504204
Event: Global Intelligent Industry Conference 2018, 2018, Beijing, China

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.

Citation Download Citation

Bidan Liu, Chang Liu, and Yanfei Wang "A new approach for SAR baseband Doppler centroid estimation", Proc. SPIE 10835, Global Intelligence Industry Conference (GIIC 2018), 1083512 (31 August 2018); https://doi.org/10.1117/12.2504204

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