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遥感技术与应用  2015, Vol. 30 Issue (4): 677-683    DOI: 10.11873/j.issn.1004-0323.2015.4.0677
图像与数据处理     
高分辨率SAR辐射定标中两种角反射器响应测量方法的应用对比研究
陈金星1,2,张波1,王超1,雷万明3,吴樊1
(1.中国科学院遥感与数字地球研究所,中国科学院数字地球重点实验室,北京 100094;
2.中国科学院大学,北京 100049;
3.南京电子技术研究所,江苏 南京 210013)
Comparative Study on the Applicability of Two Corner Reflector based Radiometric Calibration Methods for High Resolution Airborne SAR Image
Chen Jinxing1,2,Zhang Bo1,Wang Chao1,Lei Wanming3,Wu Fan
 (1.Key Laboratory of Digital Earth Science,Institute of Remote Sensing and Digital Earth,
Chinese Academy of Sciences,Beijing 100094,China;
2.University of Chinese Academy of Sciences,Beijing 100049,China;
3.Nanjing Research Institute of Electronics Technology,Nanjing 210039,China)
 全文: PDF(3896 KB)  
摘要:

利用角反射器进行SAR图像辐射定标是一种简单、实用、精度较高的绝对定标方法。其关键技术包括角反射器响应测量、天线方向图拟合和定标常数确定。针对机载分米级高分SAR影像定标问题,在同一场景中布设了30和10 cm两组三面角反射器,依据雷达中心入射角估计值、均方根误差和变异系数等指标,分析了已有的两种角反射器响应测量方法,即峰值法和积分法的适用性,并提出了一种新的天线方向图拟合方法。最后给出了两种方法对高分辨率SAR辐射定标的适用性结论。

关键词: 高分辨率SAR辐射定标峰值法积分法    
Abstract:

Radiometric calibration of Synthetic Aperture Radar (SAR) using corner reflectors is a simple,practical and high precision external calibration approach.The key technologies in the calibration process includes a power estimation of the reflector impulse response,antenna pattern fitting and the determination of absolute calibration factor.In order to compare and analyze the applicability of the two common estimation methods of reflector impulse response,i.e.,peak method and integral method,on airborne high\|resolution SAR images,two radiometric calibration experiments based on two groups of trihedral corner reflectors (C30 and C10) in different sizes are conducted.In view of the unstable platform of airborne SAR,a new method of antenna fitting is proposed in this paper.Six criterions including the estimation value of medium incidence angle,RMSE,MEAN,STDEV,coefficient of variation (C.V) and precision of calibration are used to evaluate the applicability of the two methods.Experimental results show that the precision of peak method and integral method is similar when used the C30 corner reflector group,and the peak method performs is better than integral method when used the C10 group.The high resolution SAR image has a strong ability to represent the details of ground objects so that it difficult to select homogeneous background to estimate impulse response in the integral method,so a relatively large size reflectors with a large background should be used.When the imaging system is focused well,the peak method is suggested,otherwise,the integral method should be used.

Key words: High resolution SAR    Radiometric calibration    Peak method    Integral method
收稿日期: 2014-03-03 出版日期: 2015-09-22
:  TP 75  
基金资助:

国家自然科学基金(41331176,41371413)资助。

通讯作者: 张波(1976-),男,河南新乡人,副研究员,主要从事SAR图像处理与目标识别研究。Email:zhangbo@radi.ac.cn。    
作者简介: 陈金星(1988-),男,江西宜春人,硕士研究生,主要从事SAR图像处理研究。Email:chenjx@radi.ac.cn。
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引用本文:

陈金星,张波,王超,雷万明,吴樊. 高分辨率SAR辐射定标中两种角反射器响应测量方法的应用对比研究[J]. 遥感技术与应用, 2015, 30(4): 677-683.

Chen Jinxing,Zhang Bo,Wang Chao,Lei Wanming,Wu Fan. Comparative Study on the Applicability of Two Corner Reflector based Radiometric Calibration Methods for High Resolution Airborne SAR Image. Remote Sensing Technology and Application, 2015, 30(4): 677-683.

链接本文:

http://www.rsta.ac.cn/CN/10.11873/j.issn.1004-0323.2015.4.0677        http://www.rsta.ac.cn/CN/Y2015/V30/I4/677

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