[仿真]SMOS Calibration

Abstract—The calibration of the Soil Moisture and Ocean @zr8%8n  
Salinity (SMOS) payload instrument, known as Microwave VBbUl|X\  
Imaging Radiometer by Aperture Synthesis (MIRAS), is based )BF \!sTn  
on characterization measurements which are performed initially RRS~ xOg  
on-ground prior to launch and, subsequently, in-flight. A good YeRcf`  
calibration is a prerequisite to ensure the quality of the geophysical P1 7>6)a  
data. The calibration scheme encompasses both the spaceborne q,;".3VQ  
instrument and the ground data processing. Once the system has ~
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been calibrated, the instrument performance can be verified, and <TLGfA1bC  
the higher level geophysical variables, soil moisture and ocean %z-dM` i  
salinity, can be validated. In this paper, the overall calibration $ DDSN  
approach is presented, focusing on the main aspects relevant to the VMxYZkMNd_  
SMOS instrument design and mission requirements. The distributed MfXt+c`r  
instrument, comprising 72 receivers, leads to a distributed MtZt8s  
internal calibration approach supported by specific external calibration HUU >hq9  
measurements. The relationship between the calibration (XbMrPKG  
data and the routine ground processing is summarized, demonstrating ;OQ'B=uK  
the inherent link between them. Finally, the approach to ?JXBWB4  
the in-flight commissioning activities is discussed. 2I]]WBW#:  
Index .. ub`z7gL  
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