PALSAR Radiometric and Geometric Calibration
PALSAR Radiometric and Geometric Calibration
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DOI：
10.1109/tgrs.2009.2023909
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发表时间：
2009-12-01
影响因子：
8.2
通讯作者：
Isono, Kazuo
中科院分区：
文献类型：
--
作者：
Shimada, Masanobu;Isoguchi, Osamu;Isono, Kazuo
本文总结了先进的陆地观测卫星上的相控阵L波段合成孔径雷达（PALSAR）的几何和辐射定标所获得的结果，这已经在空间三年。PALSAR的所有成像模式，即，单、双和全极化条带模式和扫描合成孔径雷达（SCANSAR），使用在全球范围内收集的总共572个校准点和主要从亚马逊森林中选择的分布目标进行了校准和验证。通过原始数据特征化、利用分布式目标数据进行天线方向图估计、利用亚马逊河流域的法拉第无旋转区进行极化定标，对PALSAR进行了辐射定标和几何定标，确定了条带模式的几何精度为9.7 m均方根（rms），SCANSAR的几何精度为70 m，角反射器分析的辐射精度为0.76 dB，亚马逊数据分析的辐射精度为0.22 dB（标准差）。极化校准成功，VV/HH幅度平衡为1.013（0.0561 dB），标准偏差为0.062，相位平衡为0.612度，标准偏差为2.66度。
This paper summarizes the results obtained from geometric and radiometric calibrations of the Phased-Array L-Band Synthetic Aperture Radar (PALSAR) on the Advanced Land Observing Satellite, which has been in space for three years. All of the imaging modes of the PALSAR, i.e., single, dual, and full polarimetric strip modes and scanning synthetic aperture radar (SCANSAR), were calibrated and validated using a total of 572 calibration points collected worldwide and distributed targets selected primarily from the Amazon forest. Through raw-data characterization, antenna-pattern estimation using the distributed target data, and polarimetric calibration using the Faraday rotation-free area in the Amazon, we performed the PALSAR radiometric and geometric calibrations and confirmed that the geometric accuracy of the strip mode is 9.7-m root mean square (rms), the geometric accuracy of SCANSAR is 70 m, and the radiometric accuracy is 0.76 dB from a corner-reflector analysis and 0.22 dB from the Amazon data analysis (standard deviation). Polarimetric calibration was successful, resulting in a VV/HH amplitude balance of 1.013 (0.0561 dB) with a standard deviation of 0.062 and a phase balance of 0.612 degrees with a standard deviation of 2.66 degrees.