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Sensors 2018, 18(4), 978;

Research on Strong Clutter Suppression for Gaofen-3 Dual-Channel SAR/GMTI

Space Microwave Remote Sensing System Department, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China
Institute of Electronic Information Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210006, China
Author to whom correspondence should be addressed.
Received: 23 January 2018 / Revised: 27 February 2018 / Accepted: 22 March 2018 / Published: 26 March 2018
(This article belongs to the Special Issue First Experiences with Chinese Gaofen-3 SAR Sensor)
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In spaceborne synthetic aperture radar (SAR), moving targets are almost buried in ground clutter due to the wide clutter Doppler spectrum and the restricted pulse repetition frequency (PRF), which increases the difficulty of moving target detection. Clutter suppression is one of the key issues in the spaceborne SAR moving target indicator operation. In this paper, we describe the clutter suppression principle and analyze the influence of amplitude and phase error on clutter suppression. In the following, a novel dual-channel SAR clutter suppression algorithm is proposed, which is suitable for the Gaofen-3(GF-3) SAR sensor. The proposed algorithm consists of three technique steps, namely adaptive two-dimensional (2D) channel calibration, refined amplitude error correction and refined phase error correction. After channel error is corrected by these procedures, the clutter component, especially a strong clutter component, can be well suppressed. The validity of the proposed algorithm is verified by GF-3 SAR real data which demonstrates the ground moving-target indication (GMTI) capability of GF-3 SAR sensor. View Full-Text
Keywords: Gaofen-3; SAR/GMTI; clutter suppression; error correction Gaofen-3; SAR/GMTI; clutter suppression; error correction

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Zheng, M.; Yan, H.; Zhang, L.; Yu, W.; Deng, Y.; Wang, R. Research on Strong Clutter Suppression for Gaofen-3 Dual-Channel SAR/GMTI. Sensors 2018, 18, 978.

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