首页> 外文期刊>Geoscience and Remote Sensing Letters, IEEE >Correction of Time-Varying Radiometric Errors in TRMM Microwave Imager Calibrated Brightness Temperature Products
【24h】

Correction of Time-Varying Radiometric Errors in TRMM Microwave Imager Calibrated Brightness Temperature Products

机译:校正TRMM微波成像仪校准的亮度温度产品中随时间变化的辐射误差

获取原文
获取原文并翻译 | 示例
       

摘要

This letter presents an empirical correction for a time-varying radiometric calibration error (2.5 K peak to peak) present in the Tropical Rainfall Measuring Mission (TRMM) Microwave Imager (TMI) 1B11 calibrated brightness temperature $(T_{b})$ data product. The $T_{b}$ error is modeled as a function of the spacecraft orbit position and the Sun elevation above the orbit plane (solar beta angle) based on the observed systematic differences between the TMI 10-GHz vertically polarized (10-V) channel oceanic $T_{b}$ 's as compared to a radiative transfer model with collocated numerical weather model environmental parameters. Assuming a slightly emissive reflector, the errors in the other TMI channels are estimated from the 10-GHz error model. This method is evaluated using before- and after-correction comparisons of 1B11 data over the ocean and Amazon, and results show that this method effectively eliminates the time-varying calibration error. This correction technique will be implemented in version 7 of the TRMM 1B11 data product, which is scheduled to be released in 2010.
机译:这封信提出了对热带降雨测量任务(TRMM)微波成像仪(TMI)1B11校准的亮度温度$(T_ {b})$数据产品中存在的随时间变化的辐射校准误差(峰到峰2.5 K)的经验校正。 。根据观察到的TMI 10-GHz垂直极化(10-V)之间的系统差异,将$ T_ {b} $误差建模为航天器轨道位置和太阳在轨道平面上方的仰角(太阳β角)的函数通道海洋$ T_ {b} $与具有并置数值天气模型环境参数的辐射传输模型相比。假设反射器的辐射很小,则根据10 GHz误差模型估算其他TMI通道中的误差。通过对海洋和亚马逊地区的1B11数据进行校正前和校正后的比较,对该方法进行了评估,结果表明该方法有效消除了随时间变化的校准误差。此校正技术将在TRMM 1B11数据产品的版本7中实现,该产品计划于2010年发布。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号