李根^1,,,
马彦恒¹,
侯建强¹,
徐公国²
1.陆军工程大学石家庄校区无人机工程系 石家庄 050003
2.陆军工程大学石家庄校区电子与光学工程系 石家庄 050003

详细信息

作者简介:李根：男，1991年生，博士生，主要从事机动平台大斜视SAR成像和压缩感知雷达成像研究
马彦恒：男，1968年生，教授，博士生导师，主要从事机动SAR成像、低小慢目标探测等方向的研究
侯建强：男，1991年生，博士生，主要从事曲线SAR 3维成像研究
徐公国：男，1990年生，博士生，主要从事雷达信号处理与传感器融合研究

通讯作者:李根　radarlg@163.com

中图分类号:TN958

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出版历程

收稿日期:2019-09-03
修回日期:2020-05-29
网络出版日期:2020-06-04
刊出日期:2020-09-27

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

Gen LI^1,,,
Yanheng MA¹,
Jianqiang HOU¹,
Gongguo XU²
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


摘要
摘要:大机动条件下的曲线轨迹大斜视SAR系统传递函数具有复杂的多维空变性，现有的高效频域回波模拟算法均难以实现扩展场景的高精度回波模拟。为此，该文提出一种基于子孔径Keystone变换的机动SAR回波模拟方法。该方法根据距离徙动校正后的距离压缩函数对场景的距离压缩回波进行快速模拟，然后通过高精度的距离向逆处理实现扩展场景的回波模拟。为减少残余距离徙动对回波模拟精度的影响，距离向处理过程中采用子孔径Keystone变换的方法实现空变距离徙动的精确校正。理论分析和仿真结果表明，所提方法能够快速高精度地模拟扩展场景的机动平台大斜视SAR原始回波数据。
关键词:SAR/
回波模拟/
曲线轨迹/
子孔径Keystone变换
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.
Key words:SAR/
Echo simulation/
Curve trajectory/
Sub-aperture Keystone transform



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