机载大气红外高分辨率光谱的信息量分析

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机载红外高分辨率干涉光谱仪(HIS)是遥感大气信息的大气红外背景辐射测量装置。基于HIS红外高光谱大气数据, 对大气温度和主要大气吸收气体进行了敏感性分析; 并通过引入信息容量的概念, 利用一维变分方法, 对HIS测量装置遥感探测大气参数的能力进行评估, 定量描述了HIS测量的红外光谱反演大气温度和水汽的信息容量、自由度和垂直分辨率等信息, 其中温度、水汽的信息容量分别为49.5、25.2; 自由度分别为10.5、5.6, 温度的平均垂直分辨率为2.2 km, 水汽的垂直分辨率为2 km; 讨论了HIS的反演精度与仪器测量误差之间的关系, 获取了大气温湿廓线的最小可探测精度。
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