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Sensors 2018, 18(2), 455; https://doi.org/10.3390/s18020455

Research on Synthetic Aperture Radar Processing for the Spaceborne Sliding Spotlight Mode

1
School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, China
2
Nanjing Research Institute of Electronics Technology, Nanjing 210039, China
*
Author to whom correspondence should be addressed.
Received: 18 December 2017 / Revised: 18 January 2018 / Accepted: 30 January 2018 / Published: 3 February 2018
(This article belongs to the Special Issue First Experiences with Chinese Gaofen-3 SAR Sensor)

Abstract

Gaofen-3 (GF-3) is China’ first C-band multi-polarization synthetic aperture radar (SAR) satellite, which also provides the sliding spotlight mode for the first time. Sliding-spotlight mode is a novel mode to realize imaging with not only high resolution, but also wide swath. Several key technologies for sliding spotlight mode in spaceborne SAR with high resolution are investigated in this paper, mainly including the imaging parameters, the methods of velocity estimation and ambiguity elimination, and the imaging algorithms. Based on the chosen Convolution BackProjection (CBP) and PFA (Polar Format Algorithm) imaging algorithms, a fast implementation method of CBP and a modified PFA method suitable for sliding spotlight mode are proposed, and the processing flows are derived in detail. Finally, the algorithms are validated by simulations and measured data. View Full-Text
Keywords: synthetic aperture radar (SAR); sliding spotlight mode; CBP algorithm; PFA algorithm; Gaofen-3 synthetic aperture radar (SAR); sliding spotlight mode; CBP algorithm; PFA algorithm; Gaofen-3
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Shen, S.; Nie, X.; Zhang, X. Research on Synthetic Aperture Radar Processing for the Spaceborne Sliding Spotlight Mode. Sensors 2018, 18, 455.

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