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-  2008 

S波段雷达数据反演土壤水分的模拟分析和验证

Keywords: S波段,SAR,土壤水分,后向散射系数,AIEM模型

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Abstract:

摘要: 中国自主研制的环境减灾卫星星座(HJ)中包含多颗光学和雷达小卫星,这些小卫星计划于2007年底陆续升空。其中,载有S波段合成孔径雷达(SAR)的HJ-1C星,预计于2008年发射,该卫星设置有S波段(3.2GHz),采用VV极化方式,入射角变化范围是25°~47°。本文根据该雷达卫星的系统参数,利用AIEM模型的模拟数据反演土壤水分的变化。首先,对传统单极化SAR数据反演土壤水分的方法(基于简单散射模型)在S波段的适用性进行了分析(共检验了四个波段数据,分别是Ku波段、C波段、S波段和L波段),结果表明该方法可应用于S波段,且应用效果比C波段好;然后,对以往研究中该方法可采用的不同水分参数形式进行了比较分析,结果表明,以垂直极化幅度作为土壤水分参数效果最好;最后,利用模拟数据对该方法进行验证,结果在两次数据入射角差为5°时,近80%数据的误差在5%以内。

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