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Sensors 2017, 17(12), 2950; doi:10.3390/s17122950

Investigation of Wavenumber Domain Imaging Algorithm for Ground-Based Arc Array SAR

1
Electronics & Information Engineering, Beihang University, Beijing 100191, China
2
College of Information Engineering, Inner Mongolia University of Technology, Hohhot 010051, China
3
Information Science Academy, China Electronics Technology Group Corporation, Beijing 100098, China
*
Author to whom correspondence should be addressed.
Received: 23 October 2017 / Revised: 10 December 2017 / Accepted: 15 December 2017 / Published: 19 December 2017
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Abstract

Ground-based synthetic aperture radar (GB-SAR) has become an important technique for remote sensing deformation monitoring. However, most of the existing GB-SAR systems realize synthetic aperture by exploiting two closely spaced horn antennas to move along a linear rail. In order to obtain higher data acquisition efficiency and a wider view angle, we introduce arc antenna array technology into the GB-SAR system, which realizes a novel kind of system: ground-based arc array SAR (GB-AA-SAR). In this paper, we analyze arc observation geometry and derive analytic expressions of sampling criteria. Then, we propose a novel wavenumber domain imaging algorithm for GB-AA-SAR, which can achieve high image reconstruction precision through numerical solutions in the wavenumber domain. The proposed algorithm can be applied in wide azimuth view angle scenarios, and the problem of azimuth mismatch caused by distance approximation in arc geometric efficient omega-k imaging can be solved successfully. Finally, we analyze the two-dimensional (2D) spatial resolution of GB-AA-SAR, and verify the effectiveness of the proposed algorithm through numerical simulation experiments. View Full-Text
Keywords: arc antenna array; ground-based SAR; numerical solution; wavenumber domain; wide view angle imaging arc antenna array; ground-based SAR; numerical solution; wavenumber domain; wide view angle imaging
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Huang, Z.; Sun, J.; Tan, W.; Huang, P.; Han, K. Investigation of Wavenumber Domain Imaging Algorithm for Ground-Based Arc Array SAR. Sensors 2017, 17, 2950.

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