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Sensors 2018, 18(8), 2562;

A Real-Time Imaging Algorithm Based on Sub-Aperture CS-Dechirp for GF3-SAR Data

National Laboratory of Radar Signal Processing, Xidian University, Xi’an 710071, China
School of Physics and Optoelectronic Engineering, Xidian University, Xi’an 710071, China
College of Geomatics, Xi’an University of Science and Technology, Xi’an 710054, China
Author to whom correspondence should be addressed.
Received: 30 June 2018 / Revised: 29 July 2018 / Accepted: 2 August 2018 / Published: 5 August 2018
(This article belongs to the Special Issue First Experiences with Chinese Gaofen-3 SAR Sensor)
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Conventional synthetic aperture radar (SAR) imaging algorithms usually require a period of time to process data that is longer than the time it takes to record one synthetic aperture or that corresponding to an adequate azimuth resolution. That is to say, the real-time processing system is idle during the long data recording time and the utilization of computational resources is low. To deal with this problem, a real-time imaging algorithm based on sub-aperture chirp scaling dechirp (CS-dechirp) is proposed in this paper. With CS-dechirp, the sub-aperture data could be processed to form an image with relatively low resolution. Subsequently, a few low-resolution images are generated as longer azimuth data are recorded. At the stage of full-resolution image generation, a coherent combination method for the low-resolution complex-value images is developed. As the low-resolution complex-value images are coherently combined one by one, the resolution is gradually improved and the full-resolution image is finally obtained. The results of a simulation and real data from the GF3-SAR validate the effectiveness of the proposed algorithm. View Full-Text
Keywords: GF3-SAR; real-time; CS-dechirp; coherently combination; pipeline structure GF3-SAR; real-time; CS-dechirp; coherently combination; pipeline structure

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Sun, G.-C.; Liu, Y.; Xing, M.; Wang, S.; Guo, L.; Yang, J. A Real-Time Imaging Algorithm Based on Sub-Aperture CS-Dechirp for GF3-SAR Data. Sensors 2018, 18, 2562.

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