短波红外吸收带林火与背景辐射亮度比较分析

对于短波红外吸收带图像高温目标特征的研究有利于提高红外目标的识别率。短波红外吸收通道可探测的地面高温目标辐射特征除了与目标温度有关，还受到大气参数状况、遥感器参数设置等影响。采用仿真分析方法，较为系统地获得了不同大气条件下林火目标与地面背景辐射数据，分析了二者的特征差异，并仿真分析了波段带宽设置对仪器接收到的辐射能量的影响。研究表明仪器带宽设置对高温目标的探测信噪比起决定作用，其次，大气模式设置不同，在短波红外水体吸收通道，林火与背景的辐射亮度特征差异显著不同。地面背景入瞳处总辐射在4.3 um附近吸收带主要受程辐射影响，在2.7 um附近吸收带主要受水汽含量影响。

Comparison of Radiation Characteristics of Forest Fire and Background in Short Wave Infrared Absorption Bands

It’s beneficial to improve the recognition accuracy of infrared target in use of short wave infrared absorption bands images. The radiation features of ground high temperature target that can be detected by short wave infrared absorption channels are influenced by atmospheric parameters, remote sensor parameters except for the temperature of the target. For different atmospheric parameters, the radiation data of forest fire and background were obtained systematically by simulation method and an analysis were carried out between them. Results showed that the bandwidth played a major role in the SNR of detecting high temperature targets, and the atmospheric model was in the second place. In the short wave infrared water absorption channel, the radiation features of the forest fire and the background were significantly different. The total radiation on the pupil of the remote sensor of the background around the 4.3 um is mostly affected by path radiation, while around the 2.7 um it mostly affected by atmospheric column water vapor.