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首页> 外文会议>IEEE International Geoscience and Remote Sensing Symposium >Soil Moisture Active Passive (SMAP) microwave radiometer radio-frequency interference (RFI) mitigation: Algorithm updates and performance assessment
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Soil Moisture Active Passive (SMAP) microwave radiometer radio-frequency interference (RFI) mitigation: Algorithm updates and performance assessment

机译：土壤水分主动无源（SMAP）微波辐射计减轻射频干扰（RFI）：算法更新和性能评估

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摘要

The Soil Moisture Active Passive (SMAP) mission, launched January 31, 2015, provides global observations of 1.4 GHz Earth thermal emissions from space through its L-band radiometer. Although SMAP's radiometer passband lies within the protected 1.4-1.427 GHz band, both unauthorized in-band transmitters as well as out-of-band emissions from transmitters operating at frequencies adjacent to this allocated spectrum have been documented as sources of radio frequency interference (RFI) to the L-band radiometers on SMOS and Aquarius. Low level RFI (0.1-10 Kelvin) is especially problematic as it can be mistaken for natural variability and if left unmitigated can corrupt radiometer measurements leading to flawed retrievals. SMAP has an aggressive approach to RFI mitigation using an advanced digital microwave radiometer to provide time and frequency measurements as well as a comprehensive ground processing algorithm.
机译：2015年1月31日启动的土壤水分主动无源（SMAP）任务通过其L波段辐射计对太空中1.4 GHz地球的热辐射进行了全球观测。尽管SMAP的辐射计通带位于受保护的1.4-1.427 GHz频带内，但未经授权的带内发射机以及在与该分配频谱相邻的频率下工作的发射机的带外发射均已记录为射频干扰源（RFI ）到SMOS和水瓶座上的L波段辐射计。较低的RFI（0.1-10开尔文）尤其成问题，因为它可能会被误认为是自然变异性，如果不加以缓解会损坏辐射计的测量结果，从而导致错误的检索结果。 SMAP采用先进的数字微波辐射计来提供时间和频率测量，以及全面的地面处理算法，具有积极的RFI缓解方法。

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