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Performance of SMAP radiometer RFI detection algorithms and analysis of residual RFI sources

机译:SMAP辐射计RFI检测算法的性能以及残留RFI源的分析

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NASA's Soil Moisture Active and Passive (SMAP) satellite was launched in January 2015 to provide global measurements of soil moisture and freeze/thaw state. Soil moisture products are derived from SMAP radiometer measurements acquired at L Band (1.4 GHz). Even though this is a protected band, unauthorized transmitters emitting either within the band or in adjacent bands cause radio frequency interference (RFI). Because RFI contributions corrupt the radiometer measurements and therefore can lead to biases in retrieved soil moisture, the SMAP radiometer includes special hardware to enable RFI detection and filtering using multiple detection algorithms. This paper investigates the performance of SMAP's RFI detectors, which include pulse, cross-frequency, kurtosis, and polarimetric methods, as a function of the power of the RFI sources. Methods for examining residual RFI remaining after detection and filtering is applied are also discussed.
机译:美国国家航空航天局(NASA)的“主动和被动”土壤水分(SMAP)卫星于2015年1月发射,用于对土壤水分和冻融状态进行全球测量。土壤水分产物来自在L波段(1.4 GHz)下获得的SMAP辐射计测量结果。即使这是一个受保护的频段,在该频段内或相邻频段内发射的未经授权的发射机也会造成射频干扰(RFI)。由于RFI的贡献会破坏辐射计的测量结果,并因此可能导致回收的土壤水分出现偏差,因此SMAP辐射计包括特殊的硬件,从而可以使用多种检测算法进行RFI检测和过滤。本文研究了SMAP的RFI检测器的性能,包括脉冲,交叉频率,峰度和极化方法,这些都是RFI源功率的函数。还讨论了在应用检测和过滤后检查残留RFI残留的方法。

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