Image and Signal Processing Methods

Array error estimation method for multichannel synthetic aperture radar systems in azimuth

[+] Author Affiliations
Xiaojiang Guo, Yesheng Gao, Kaizhi Wang, Xingzhao Liu

Shanghai Jiao Tong University, School of Electronic Information and Electrical Engineering, Shanghai, China

J. Appl. Remote Sens. 11(1), 015027 (Mar 30, 2017). doi:10.1117/1.JRS.11.015027
History: Received November 10, 2016; Accepted March 14, 2017
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Abstract.  Multichannel synthetic aperture radar systems are usually employed to suppress azimuth ambiguity and realize high-resolution wide-swath imaging. However, unavoidable array errors will significantly degrade the performance of ambiguity suppression and imaging quality. This paper presents an array error estimation method based on cross correlation. First, unambiguous Doppler spectra are obtained by selecting a short length of range profiles from strong targets. Then, array errors are estimated by a proposed cross-correlation method. Finally, a preprocessing method to improve the estimation accuracy is proposed. The proposed method takes full advantage of the training samples from strong targets and estimates array errors by the coherent integration technique, which improves the estimation accuracy and robustness. Theoretical analysis and experiments based on simulations and measurements showed the validity of the proposed method, especially in low signal-to-noise ratios.

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Citation

Xiaojiang Guo ; Yesheng Gao ; Kaizhi Wang and Xingzhao Liu
"Array error estimation method for multichannel synthetic aperture radar systems in azimuth", J. Appl. Remote Sens. 11(1), 015027 (Mar 30, 2017). ; http://dx.doi.org/10.1117/1.JRS.11.015027


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