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Open AccessArticle

GRFT-Based Moving Ship Target Detection and Imaging in Geosynchronous SAR

by Ying Zhang 1, Wei Xiong 1, Xichao Dong 2,3,*, Cheng Hu 2,3 and Yang Sun 1
1
Science and Technology on Complex Electronic System Simulation Laboratory, Space Engineering University, Beijing 101416, China
2
School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China
3
Key Laboratory of Electronic and Information Technology in Satellite Navigation (Beijing Institute of Technology), Ministry of Education, Beijing 100081, China
*
Author to whom correspondence should be addressed.
Remote Sens. 2018, 10(12), 2002; https://doi.org/10.3390/rs10122002
Received: 30 October 2018 / Revised: 27 November 2018 / Accepted: 6 December 2018 / Published: 10 December 2018
(This article belongs to the Section Remote Sensing Image Processing)
Geosynchronous synthetic aperture radar (GEO SAR) has great potentials in ship surveillance due to its high time resolution and wide swath coverage. However, the remote slant range will result in a very low signal-to-noise ratio (SNR) of echoes that need to be enhanced by long-time coherent integration. The generalized Radon-Fourier transform (GRFT) can realize the coherent integration of moving target under long integration time by jointly parameter searching along range and velocity directions. Unfortunately, in GEO SAR, the very large slant range and long synthetic aperture will cause the curved synthetic aperture trajectory and non-negligible signal round-trip delay, leading to the failure of the traditional slant range and GRFT signal model for moving targets. This paper proposes an improved GRFT-based approach to realize the detection and imaging of moving ship targets in GEO SAR. Firstly, the accurate slant range for moving ship targets is constructed and the GRFT signal is redefined considering the curved trajectory and signal round-trip delay in GEO SAR. Then, GRFT responses to different motion parameters are analyzed. The procedures of moving ship targets detection and imaging in GEO SAR are presented through the detection with coarse-searched motion parameters in GRFT and the following imaging with fine-searched motion parameters based on minimum entropy. Finally, computer simulations verify the proposed GRFT-based method. View Full-Text
Keywords: GEO SAR; moving ship target; GRFT GEO SAR; moving ship target; GRFT
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MDPI and ACS Style

Zhang, Y.; Xiong, W.; Dong, X.; Hu, C.; Sun, Y. GRFT-Based Moving Ship Target Detection and Imaging in Geosynchronous SAR. Remote Sens. 2018, 10, 2002.

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