高分辨率SAR定标参考目标辐射特性的校正方法

洪峻; 雷大力; 王宇; 费春娇

doi:10.11999/JEIT150570

高分辨率SAR定标参考目标辐射特性的校正方法

doi: 10.11999/JEIT150570

基金项目:

对地观测系统国家科技重大专项(GFZX0403220402, GFZX04032204)

计量
- 文章访问数: 1769
- HTML全文浏览量: 308
- PDF下载量: 559
- 被引次数: 0
出版历程
- 收稿日期: 2015-05-13
- 修回日期: 2015-11-10
- 刊出日期: 2016-02-19

Correction Methods of Calibration Reference Targets RadiometricCharacteristic in High-resolution SAR Systems

Funds:

National Science and Technology Major Project on Earth Observation System (GFZX0403220402, GFZX04032204)

摘要

摘要: 定标参考目标雷达截面积(RCS)的频率、入射角相关性是一个固有性质，对于常规SAR系统，在小带宽/窄方位波束条件下通常近似认为目标具有恒定的后向散射特性，即RCS为一常数；然而，对于高分辨率SAR系统，继续用中心频点、方位角处的RCS表示大信号带宽/宽方位波束条件下的RCS，将会直接影响辐射定标的准确性。鉴于此，该文提出基于标准数据或参考定标体的目标辐射特性校正方法，暗室地基SAR系统仿真结果表明，在目标辐射特性校正前后，点目标积分能量相差1.2 dB；实测数据处理结果显示，经过参考目标辐射特性校正，SAR图像中点目标旁瓣更加对称，且方位向主瓣宽度变窄，在时域更接近理想点目标冲激响应，从而验证了校正算法的有效性。
- 高分辨率SAR系统 /
- 辐射定标 /
- 雷达截面积 /
- 参考目标辐射特性校正 /
- 地基SAR系统
Abstract: The calibration reference point targets Radar Cross Section (RCS) is a inherent property depending on frequency and incidence angle, for traditional SAR systems, which can be approximately regarded as a constant under the condition of narrowband and narrow beam. However, for high-resolution SAR systems, replacing the RCS in the case of wideband and wide beam by the RCS of central frequency and azimuth aspect, will result in an inaccurate radiometric calibration output. In this paper, correction methods of reference point targets in the echo domain or in the complex image domain are presented. From the experimental result of simulation and ground-based SAR, it can be seen that the absolute calibration factor varies over 1.2 dB before and after the reference point target correction. The results of real data show that point targets in the SAR image are more symmetric after correction of reference targets radiometric characteristic, and the main lobe in azimuth becomes narrower, which is more close to ideal point target impulse response in time domain, thus validating the effectiveness of the correction algorithm.
- High-resolution SAR systems /
- Radiometric calibration /
- Radar Cross Section (RCS) /
- Correction of reference targets radiometric characteristic /
- Ground-based SAR system

HTML全文

参考文献(27)

CURLANDER J C. 韩传钊译. 合成孔径雷达系统与信号处理[M]. 北京: 电子工业出版社, 2006: 217-220.

CURLANDER J C. Synthetic Aperture Radar: Systems and Signal Processing[M]. Beijing: Publishing House of Electronics Industry, 2006: 217-220.

李震, 廖静娟. 合成孔径雷达地表参数反演模型与方法[M]. 北京: 科学出版社, 2011: 24-33.

LI Zhen and LIAO Jingjuan. Synthetic Aperture Radar Earth Surface Parameters Inversion Models and Approaches[M]. Beijing: Science Press, 2011: 24-33.

FREEMAN A. SAR calibration: an overview[J]. IEEE Transactions on Geoscience and Remote Sensing, 1992, 30(6): 1107-1123.

GRAY A L, PARIS W V, and CHARLES E L. Synthetic aperture radar calibration using reference reflectors[J]. IEEE Transactions on Geoscience and Remote Sensing, 1990, 28(3): 374-382.

邹鲲. 低频UWB-SAR校准技术研究[D]. [博士论文], 国防科学技术大学, 2005: 32-46.

ZOU Kun. Research on low frequency UWB-SAR calibration technique[D]. [Ph.D. dissertation], National University of Defense Technology, 2005: 32-46.

VIET T V, THOMAS K S, and MATS I P. An impulse response function for evaluation of UWB SAR imaging[J]. IEEE Transactions on Signal Processing, 2010, 58(7): 3927-3932.

VIET T V, THOMAS K S, and MATS I P. On synthetic aperture radar azimuth and range resolution equations [J]. IEEE Transactions on Aerospace and Electronic Systems, 2012, 48(2): 1764-1769.

ULANDER L M H. Impulse response function for Ultra-wideband SAR[C]. 10th European Conference on Synthetic Aperture Radar, Berlin, Germany, 2014: 798-801.

林新越. 高分辨率SAR参考目标辐射特性分析与校正方法研究[D]. [硕士论文], 中国科学院电子学研究所, 2010: 63-99.

LIN Xinyue. Research on analysis and calibration methods for high resolution SAR reference targets radiometric characteristics[D]. [Master dissertation], Institute of Electrics, Chinese Academy of Sciences, 2010: 63-99.

BJORN J D, PHILIPP R L, MATTHIAS J, et al. Reference target correction based on point-target SAR simulation[J]. IEEE Transactions on Geoscience and Remote Sensing, 2012, 50(3): 951-958.

BJORN J D and MARCO S. The radiometric measurement quantity for SAR images[J]. IEEE Transactions on Geoscience and Remote Sensing, 2013, 51(12): 5307-5313.

Mehrdad SOUMEKH. Reconnaissance with ultra wideband UHF Synthetic Aperture Radar[J]. IEEE Signal Processing Magazine, 1995, 12(4): 21-39.

Mehrdad SOUMEKH. Signal processing of wide bandwidth and wide beamwidth P-3 SAR data[J]. IEEE Transactions on Aerospace and Electronic Systems, 2001, 37(4): 1122-1141.

孙金平. 机载聚束模式合成孔径雷达的成像算法研究[D]. [博士论文], 北京航空航天大学研究生院, 2001: 24-47.

SUN Jinping. Research on imaging algorithm of airborne spotlight mode synthetic aperture rada[D]. [Ph.D. dissertation], Graduate School of Beihang University, 2001: 24-47.

CARRAR W G, GOODMAN R S, MAJEWSKI R M, et al. Spotlight Synthetic Aperture Radar: Signal Processing Algorithms[M]. Boston, Artech House, 1995: 90101.

JAKOWATZ C V, WAHL D E, EICHEL P H, et al. Spotlight-Mode Synthetic Aperture Radar: A Signal Processing Approach[M]. Boston, Kluwer Academic Publishers, 1996: 8295.

乞耀龙. 近景微波三维成像模型与方法研究[D]. [博士论文], 中国科学院电子学研究所, 2012: 42-75.

QI Yaolong. Research on microwave three dimensional imaging model and method of close range[D]. [Ph.D. dissertation], Institute of Electrics, Chinese Academy of Sciences, 2012: 42-75.

孟大地, 丁赤飚. 一种用于宽带机载SAR的空变相位误差补偿算法[J]. 电子与信息学报, 2007, 29(10): 2375-2378.

MENG Dadi and DING Chibiao. An algorithm for space variant phase error compensation of wideband airborne SAR[J]. Journal of Electronics Information Technology, 2007, 29(10): 2375-2378.

张麟兮, 李南京, 胡楚锋, 等. 雷达目标散射特性测试与成像诊断[M]. 北京: 中国宇航出版社, 2009: 146-206.

ZHANG Linxi, LI Nanjin, HU Chufeng, et al. Test and Imaging Diagnosis of Radar Target Scattering Characteristics[M]. Beijing: China Astronautic Publishing House, 2009: 146-206.

施引文献

资源附件(0)

访问统计