宽带宽方位波束对高分辨率SAR辐射定标的影响分析

洪峻; 雷大力; 王宇; 费春娇

doi:10.12000/JR15015

宽带宽方位波束对高分辨率SAR辐射定标的影响分析

DOI: 10.12000/JR15015

1.
(中国科学院电子学研究所微波成像技术国家重点实验室北京 100190)
2.
(中国科学院大学北京 100190)

基金项目:

XXX对地观测系统重大专项(GFZX0403220402)资助课题

详细信息

作者简介:
洪峻(1960-),男,中国科学院电子学研究所,研究员,博士生导师,研究方向为SAR定标技术、机载SAR系统设计.E-mail:jhong@mail.ie.ac.cn雷大力(1989-),男,中国科学院大学硕士生,研究方向为高分辨率SAR成像及辐射定标.E-mail:leidali2010@163.com王宇(1976-),男,中国科学院电子学研究所,副研究员,研究方向为机载SAR定标技术.E-mail:wangyu@mail.ie.ac.cn费春娇(1989-),女,中国科学院大学博士生,研究方向为电磁辐射与探测技术.E-mail:iriscelia@163.com

通讯作者:
雷大力leidali2010@163.com

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出版历程
- 收稿日期: 2015-01-26
- 修回日期: 2015-04-30
- 网络出版日期: 2015-06-28

Wide Band and Wide Azimuth Beam Effect on High-resolution Synthetic Aperture Radar Radiometric Calibration

1.
(National Key Laboratory of Microwave Imaging Technology, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China)
2.
(University of Chinese Academy of Sciences, Beijing 100190, China)

摘要

摘要: 无源角反射器和有源定标器是SAR辐射定标的常用人造参考点目标,随着大量新体制、新模式高分辨率SAR系统的涌现,大距离带宽和宽方位波束都对传统观念中参考目标雷达截面积(RCS)近似恒定的假设提出挑战.该文借助FEKO电磁仿真软件获取目标RCS随频带和方位角的变化关系,结合高分辨率SAR点目标仿真,通过点目标能量提取,定量地分析参考目标RCS的频带或方位角相关性对辐射定标的影响.仿真结果表明在Ku波段相对带宽超过10%或方位波束宽度超过20时,上述因素带来的影响超过0.2 dB,必须在实际数据处理中加以校正.
- SAR辐射定标 /
- 雷达截面积(RCS) /
- 参考目标 /
- 大距离带宽和宽方位波束 /
- FEKO
Abstract: Passive corner reflectors and active transponders are often used as man-made reference targets in Synthetic Aperture Radar (SAR) radiometric calibration, With the emergence of new radar systems and the increasing demand for greater accuracy, wide-band and wide-beam radars challenge the hypothesis that the Radar Cross Section (RCS) of reference targets is constant. In this study, the FEKO electromagnetic simulation software is used to obtain the change curve of the target RCS as a function of frequency and aspect angle while incorporating high-resolution point-target SAR simulation, and quantitatively analyzing the effect of the modulation effect on SAR images. The simulation results suggest that the abovementioned factors affect the SAR calibration by more than 0.2 dB within a fractional bandwidth greater than 10% or azimuth beam width of more than 20, which must be corrected in the data processing.
- SAR calibration /
- Radar Cross Section (RCS) /
- Reference target /
- Wide-band and wide-beam /
- FEKO

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参考文献(15)

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