摘要
以TERRA卫星中分辨率成像光谱仪(MODIS)传感器热红外通道的星上定标结果为标准,采用交叉定标方法获取HJ-1B卫星红外多光谱相机(IRS)传感器热红外通道定标系数。首先,获取两个传感器的对应通道,利用MODTRAN模拟光谱响应、观测角、大气条件和温度变化对匹配因子的影响,然后确定此研究只考虑对应通道的波谱响应和地表温度差异,并计算出不同地表温度下匹配因子的变化趋势。选择7次不同时间双星同步观测青海湖区域的图像作为交叉定标数据,根据MODIS的辐射亮度和匹配因子计算出IRS传感器热红外通道的辐射亮度,最后,将得到的辐射亮度和DN值进行线性回归,获得IRS热红外通道的定标系数。将此次定标结果与HJ-1B卫星IRS传感器热红外通道星上4次黑体定标结果进行比较,定标结果一致性较好。
The calibration coefficients of thermal infrared channel of IRS sensor on HJ-1B satellite were obtained by using the cross-calibration method based on the MODIS sensor of TERRA.First,the corresponding bands of the two sensors were obtained.Then the influences of different spectral response,satellite view zenith angle,atmosphere condition and temperature change on the match factor were simulated by use of the MODTRAN.In the end,considering the dissimilar band response of the match bands,the band match factors were calculated under different temperatures.Seven images of Qinghai Lake in different times were chosen as the calibration data.On the basis of radiance of MODIS and match factor,the radiance of thermal infrared channel of IRS sensor was calculated.And then the calibration coefficients were obtained by linearly regressing the radiance and the DN value.Comparing the result of this cross-calibration with that of the onboard blackbody calibration,this consistency is better.
出处
《红外与激光工程》
EI
CSCD
北大核心
2010年第5期785-790,共6页
Infrared and Laser Engineering
基金
国防科技工业民用专项科研技术研究项目(科工技[2006]785号)
