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

Xiaojiang Guo; Yesheng Gao; Kaizhi Wang; Xingzhao Liu

doi:10.1117/1.JRS.11.015027

30 March 2017 Array error estimation method for multichannel synthetic aperture radar systems in azimuth

Xiaojiang Guo, Yesheng Gao, Kaizhi Wang, Xingzhao Liu

Author Affiliations +

Journal of Applied Remote Sensing, Vol. 11, Issue 1, 015027 (March 2017). https://doi.org/10.1117/1.JRS.11.015027

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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Xiaojiang Guo, Yesheng Gao, Kaizhi Wang, and Xingzhao Liu "Array error estimation method for multichannel synthetic aperture radar systems in azimuth," Journal of Applied Remote Sensing 11(1), 015027 (30 March 2017). https://doi.org/10.1117/1.JRS.11.015027

Received: 10 November 2016; Accepted: 14 March 2017; Published: 30 March 2017

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KEYWORDS

Error analysis

Synthetic aperture radar

Doppler effect

Signal to noise ratio

Receivers

Statistical analysis

Calibration

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