Sub-aperture Keystone Transform Based Echo Simulation Method for High-squint SAR with a Curve Trajectory

Gen LI; Yanheng MA; Jianqiang HOU; Gongguo XU

doi:10.11999/JEIT190674

Volume 42 Issue 9

Sep. 2020

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Article Navigation > Journal of Electronics & Information Technology > 2020 > 42(9): 2261-2268

Gen LI, Yanheng MA, Jianqiang HOU, Gongguo XU. Sub-aperture Keystone Transform Based Echo Simulation Method for High-squint SAR with a Curve Trajectory[J]. Journal of Electronics & Information Technology, 2020, 42(9): 2261-2268. doi: 10.11999/JEIT190674

Citation:

Gen LI, Yanheng MA, Jianqiang HOU, Gongguo XU. Sub-aperture Keystone Transform Based Echo Simulation Method for High-squint SAR with a Curve Trajectory[J]. Journal of Electronics & Information Technology, 2020, 42(9): 2261-2268. doi: 10.11999/JEIT190674

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Sub-aperture Keystone Transform Based Echo Simulation Method for High-squint SAR with a Curve Trajectory

doi: 10.11999/JEIT190674

1.
Department of UAV Engineering, Army Engineering University Shijiazhuang Campus, Shijiazhuang 050003, China
2.
Department of Electronic and Optical Engineering, Army Engineering University Shijiazhuang Campus, Shijiazhuang 050003, China

Received Date: 2019-09-03
Rev Recd Date: 2020-05-29

Available Online: 2020-06-04

Publish Date: 2020-09-27

Abstract

Abstract

The system transfer function of high-squint SAR system with curved trajectory has complex multi-dimensional spatial variability. The existing efficient frequency-domain echo simulation algorithms are difficult to achieve high-precision echo simulation of extended scenes. Therefore, a fast echo simulation method based on sub-aperture Keystone transform is proposed for maneuvering SAR. Based on the time-domain range compression function after range cell migration correction, the method calculates efficiently the range compression echo of scene, and then realizes the echo simulation of extended scene by high precision range inverse processing. In order to reduce the influence of residual range cell migration on the accuracy of echo simulation, the method of the Keystone transform of sub-aperture is used in range processing to achieve accurate correction of space-variant range cell migration in extended scenes. The theoretical analysis and simulation results show that the proposed method can quickly and accurately simulate the original echo data of extended scenes for high-squint SAR mounted on a maneuvering platform.
- SAR,
- Echo simulation,
- Curve trajectory,
- Sub-aperture Keystone transform

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References(15)

References

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