...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>IEEE Geoscience and Remote Sensing Letters >Comparison of Calibration Techniques for Ground-Based C-Band Radiometers
【24h】

Comparison of Calibration Techniques for Ground-Based C-Band Radiometers

机译：地基C波段辐射计校准技术的比较

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We quantify the performance of three commonly used techniques to calibrate ground-based microwave radiometers for soil moisture studies, external (EC), tipping-curve (TC), and internal (IC). We describe two ground-based C-band radiometer systems with similar design and the calibration experiments conducted in Florida and Alaska using these two systems. We compare the consistency of the calibration curves during the experiments among the three techniques and evaluate our calibration by comparing the measured brightness temperatures (TBs) to those estimated from a lake emission model (LEM). The mean absolute difference among the TBs calibrated using the three techniques over the observed range of output voltages during the experiments was 1.14 K. Even though IC produced the most consistent calibration curves, the differences among the three calibration techniques were not significant. The mean absolute errors (MAEs) between the observed and LEM TB s were about 2-4 K. As expected, the utility of TC at C-band was significantly reduced due to transparency of the atmosphere at these frequencies. Because IC was found to have a MAE of about 2 K that is suitable for soil moisture applications and was consistent during our experiments under different environmental conditions, it could augment less frequent calibrations obtained using the EC or TC techniques
机译：我们对三种用于土壤湿度研究的地面微波辐射计校准的常用技术（外部（EC），倾翻曲线（TC）和内部（IC））的性能进行了量化。我们描述了两个具有类似设计的地面C波段辐射计系统，以及使用这两个系统在佛罗里达州和阿拉斯加进行的校准实验。我们比较了三种技术在实验过程中校准曲线的一致性，并通过将测得的亮度温度（TBs）与根据湖泊排放模型（LEM）估算的亮度温度（TBs）进行比较来评估我们的校准。在实验期间，在观察到的输出电压范围内，使用这三种技术校准的TB之间的平均绝对差为1.14K。即使IC产生了最一致的校准曲线，这三种校准技术之间的差异也并不明显。观测到的LEM TB之间的平均绝对误差（MAE）约为2-4K。正如预期的那样，由于这些频率下的大气透明性，C波段TC的效用大大降低了。由于发现IC的MAE约为2 K，适用于土壤水分应用，并且在我们在不同环境条件下的实验中均保持一致，因此它可以增加使用EC或TC技术获得的较少频率的校准

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