Circular SAR Trajectory Reconstruction Based on Phase Gradient of Calibrators

Guo Zhen-yu; Lin Yun; Hong Wen; Tan Wei-xian; Wang Yan-ping

doi:10.11999/JEIT140950

Volume 37 Issue 8

Aug. 2015

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Article Navigation > Journal of Electronics & Information Technology > 2015 > 37(8): 1836-1842

Guo Zhen-yu, Lin Yun, Hong Wen, Tan Wei-xian, Wang Yan-ping. Circular SAR Trajectory Reconstruction Based on Phase Gradient of Calibrators[J]. Journal of Electronics & Information Technology, 2015, 37(8): 1836-1842. doi: 10.11999/JEIT140950

Citation:

Guo Zhen-yu, Lin Yun, Hong Wen, Tan Wei-xian, Wang Yan-ping. Circular SAR Trajectory Reconstruction Based on Phase Gradient of Calibrators[J]. Journal of Electronics & Information Technology, 2015, 37(8): 1836-1842. doi: 10.11999/JEIT140950

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Circular SAR Trajectory Reconstruction Based on Phase Gradient of Calibrators

doi: 10.11999/JEIT140950

Received Date: 2014-07-17
Rev Recd Date: 2015-05-07
Publish Date: 2015-08-19

Abstract

Abstract

Circular SAR (CSAR) high resolution imaging requires a more accurate and stable Inertial Navigation System (INS), therefore motion compensation is one of the key technologies. In this paper, the phase error caused by trajectory measurement error is firstly analyzed. Then, the CSAR trajectory reconstruction algorithm based on the extraction of calibrators phase gradient is proposed. This algorithm is aiming at the spatial variant property of phase errors. The azimuth differential phase of each calibrator is extracted from SAR echo data. The high precision CSAR trajectory is reconstructed via trilateration in combination with multiple calibrators phase gradient. The high quality CSAR image is formed with this trajectory. The proposed algorithm solves the problem of image defocusing by trajectory measurement error, meanwhile the entire scene gets focused efficiently. The simulation results verify the correctness and effectiveness of the proposed algorithm.
- SAR,
- Circular SAR (CSAR),
- Motion compensation,
- Trajectory reconstruction,
- Phase gradient

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References(17)

References

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