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首页> 外文期刊>IEEE Transactions on Geoscience and Remote Sensing. >Satellite sounding channel optimization in the microwave spectrum
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Satellite sounding channel optimization in the microwave spectrum

机译：微波频谱中的卫星探测信道优化

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摘要

A method is presented for creating a set of optimal channels for microwave sounding of the atmosphere. The method finds the combinations of center frequencies and bandwidths that provide optimal skill at retrieving a profile of atmospheric characteristics, such as the air temperature or water vapor concentration. The measure of optimality is a function of the degrees of freedom for the signal. The method is capable of considering several environmental regimes (e.g. latitude, season, surface type, scan angle) simultaneously while performing the optimization. Applications of the method are presented for satellite sounding at frequencies near 60, 118, and 183 GHz. The optimized channel sets compare favorably to channel sets from planned operational sensors, in terms of optimality measures and retrieval performance. For tropospheric sounding, optimal channels have spectrally broader passbands than have typically been used in satellite sounding instruments. For water vapor sounding on the 183-GHz line, the number of channels needed to achieve the full retrieval potential is shown to depend on the radiometer noise level and on the vertical structure of the water vapor profiles.
机译：提出了一种用于创建一组用于大气微波探测的最佳通道的方法。该方法找到了中心频率和带宽的组合，这些组合为检索大气特征（如气温或水蒸气浓度）的分布提供了最佳技巧。最优性的度量是信号自由度的函数。该方法能够在执行优化时同时考虑多种环境状况（例如纬度，季节，表面类型，扫描角度）。提出了该方法的应用，用于在60、118和183 GHz附近的频率进行卫星探测。在优化措施和检索性能方面，优化的通道集与计划中的操作传感器的通道集相比具有优势。对于对流层探测，与卫星探测仪器中通常使用的通道相比，最佳通道在频谱上具有更宽的通带。对于183 GHz线上的水蒸气探测，显示出实现完全回收潜力所需的通道数取决于辐射计的噪声水平和水蒸气剖面的垂直结构。

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