Envisat-ASAR数据的特点及其在多云多雨地区的应用前景  

Characteristics and Analysis of Application of Envisat-ASAR Data

作　　者：陈劲松[1] 邵芸[1] 林晖[2] 

机构地区：[1]中国科学院遥感应用研究所开放实验室,北京100101 [2]香港中文大学地球信息科学联合实验室

出　　处：《遥感技术与应用》2004年第6期517-520,共4页Remote Sensing Technology and Application

摘　　要：Envisat是由欧空局发射的一颗先进的极轨对地观测卫星,载有10种传感器,其中有先进的合成孔径雷达ASAR(AdvancedSyntheticApertureRadar)。ASAR工作在C波段,具有主动相控天线系统,5种成像模式,7种成像条带及交替极化成像功能。以获得的广东肇庆地区的ASAR交替极化模式精确分辨率图像为实例,介绍了ASAR数据的特点,分析ASAR图像中建筑物、河流、农田、船舶、林地等几种典型地物的后向散射系数值。结果表明ASAR数据可以广泛应用于多云多雨地区的土地覆盖分类,农作物估产,船只探测和海洋等领域。The Advanced Synthetic Aperture Radar (ASAR) instrument on board the ENVISAT satellite extends the mission of the Active Microwave Instrument (AMI) Synthetic Aperture Radar (SAR) instruments flown on the European Remote Sensing (ERS) Satellites ERS-1 and ERS-2. ASAR, operating at C-band, ensures continuity with the image mode (SAR) and the wave mode of the ERS-1/2 AMI. It features enhanced capability in terms of coverage, range of incidence angles, polarization, and modes of operation. In rainy and cloudy areas in southern china which are the major crop production areas in china, the regular acquisition of optical remote sensing data(MODIS,TM) is hampered by frequent cloud cover and rain. We analyzed ASAR data application potential taking Zhao Qing of Guang Dong Province as experimental area in which many kind of crop, including rice and banana, are grown. We used two ASAR dataset which are both ASAR alternating polarization precision image over the area in research. One, acquired on 13 June of 2003, had imaging swath of IS5 and polarization of HH/HV. The other, acquired on 2 July of 2003, had imaging swath of IS5 and polarization of VV/HH. We derived the backscattering coefficients of main ground objects in the images and compared them with the provious research results. The result shows that ASAR data can find a wide use in many fields such as crop growth .monitoring, ocean and ship detection.

关 键 词：ENVISAT ASAR 雷达遥感 

分 类 号：TN958[电子电信—信号与信息处理]