Maneuvering Platform High-squint SAR Imaging Method Based on Keystone Transform and Perturbation Resampling

被引：0

作者：

Li G. ^{[1
]}

Ma Y. ^{[1
]}

Hou J. ^{[1
]}

Xu G. ^{[2
]}

机构：

[1] Department of UAV Engineering, Army Engineering University Shijiazhuang Campus, Shijiazhuang

[2] Department of Electronic and Optical Engineering, Army Engineering University Shijiazhuang Campus, Shijiazhuang

来源：

Dianzi Yu Xinxi Xuebao/Journal of Electronics and Information Technology | 2020年 / 42卷 / 10期

关键词：

High-squint; Keystone transform; Maneuvering platforms; Perturbation resampling; SAR imaging;

D O I：

10.11999/JEIT20_dzyxxxb-42-10-2485

中图分类号：

学科分类号：

摘要：

The existence of acceleration and descent velocity makes the imaging parameters of high-squint SAR mounted on maneuvering platform have obvious two-dimensional spatial variability, which affects seriously the focus depth of the scene. To solve this problem, a maneuvering SAR imaging method based on Keystone transform and azimuth perturbation resampling is proposed. First of all, the range azimuth decoupling and the azimuth spectrum de Aliasing are realized by the range walk correction and de-acceleration processing. Then the spatial-variant range cell migration is corrected by the Keystone transform in the azimuth time domain; In the process of azimuth compression, the second- and third-order spatial variabilities of Doppler parameters are removed by introducing the high-order perturbation factor in the time domain, and then the first-order spatial variability of the Doppler parameters is removed by the azimuth resampling processing in the azimuth frequency domain. The proposed method can effectively correct the two-dimensional spatial variability of range cell migration trajectory and azimuth focus parameters, and realize the large scene imaging of high-squint maneuvering SAR. Simulation analysis verifies the effectiveness of the proposed method. © 2020, Science Press. All right reserved.

引用

页码：2485 / 2492

页数：7

共 16 条

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