现代防御技术 ›› 2022, Vol. 50 ›› Issue (2): 113-120.DOI: 10.3969/j.issn.1009-086x.2022.02.015

• 仿真技术 • 上一篇    

多成像模式下舰船目标SAR成像仿真

张寅, 范君杰, 闫钧华, 章琪琪, 夏翀翔   

  1. 1.南京航空航天大学,空间光电探测与感知工业和信息化部重点实验室,江苏 南京 211106
    2.南京航空航天大学,航天学院,江苏 南京 211106
  • 收稿日期:2021-09-02 修回日期:2021-12-28 出版日期:2022-04-28 发布日期:2022-04-29
  • 作者简介:张寅(1986-),男,江苏镇江人。副教授,博士,主要从事天基光电探测成像仿真与处理。通信地址:211106 江苏省南京市江宁区将军大道 29 号 E-mail:zhangyin1986@nuaa.edu.cn
  • 基金资助:
    中央高校基本科研业务费资助(NJ2020021);中央高校基本科研业务费资助(NT2020022);国家自然科学基金资助(61705104);江苏省自然科学基金资助(BK20170804)

SAR Imaging Simulation of Ship Target in Multi-Imaging Mode

Yin ZHANG, Jun-jie FAN, Jun-hua YAN, Qi-qi ZHANG, Chong-xiang XIA   

  1. Nanjing University of Aeronautics and Astronautics,a. Key Laboratory of Space Photoelectric Detection and Perception,Ministry of Industry and Information Technology; b. College of Astronautics,Jiangsu Nanjing 211106,China
  • Received:2021-09-02 Revised:2021-12-28 Online:2022-04-28 Published:2022-04-29

摘要:

针对典型工作模式下舰船目标SAR(synthetic aperture radar)成像仿真应用,建立了条带模式、聚束模式、扫描模式下电磁信号发射与回波传输模型。基于面元法将舰船目标三维模型划分为多个三角形面元,利用弹跳射线法计算舰船目标各面元的一次散射和多次散射,仿真SAR回波信号。采用距离多普勒成像算法消除回波混叠,得到SAR仿真图像。最后,对舰船目标进行多成像模式、多成像角度的仿真实验,并将仿真图像和哨兵一号A星的实测图像进行对比。仿真结果表明,提出的方法能仿真较为真实的舰船目标SAR图像。

关键词: 合成孔径雷达, 成像仿真, 舰船目标, 弹跳射线法, 距离多普勒, 面元法

Abstract:

Aiming at the SAR (synthetic aperture radar) imaging simulation application of ship targets in typical working modes, the electromagnetic signal emission and echo transmission models in strip mode, spotlight mode, and scan mode are established. Based on the panel method, the three-dimensional model of the ship target is divided into multiple triangular panels. The Shooting and Bouncing Ray algorithm is used to calculate the primary scattering and multiple scattering of each panel of the ship target, and the SAR echo signal is simulated. The range-Doppler imaging algorithm is used to eliminate echo aliasing and obtain SAR simulation image. Simulation experiments of multiple imaging modes and multiple imaging angles are performed on the ship target, and the simulated images are compared with the actual image of Sentinel-1A. The simulation results show that the proposed method can simulate more realistic SAR images of ship targets.

Key words: synthetic aperture radar(SAR), imaging simulation, ship target, shooting and bouncing ray, range-Doppler, panel method

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