[仿真]SMOS Calibration

Abstract—The calibration of the Soil Moisture and Ocean b+apNph  
Salinity (SMOS) payload instrument, known as Microwave ~6i mkv^ F  
Imaging Radiometer by Aperture Synthesis (MIRAS), is based &n kGdHX/a  
on characterization measurements which are performed initially 48rYs}  
on-ground prior to launch and, subsequently, in-flight. A good }mZ*f y0t  
calibration is a prerequisite to ensure the quality of the geophysical x+`3G.  
data. The calibration scheme encompasses both the spaceborne vg1s5Yqk  
instrument and the ground data processing. Once the system has D|3QLG  
been calibrated, the instrument performance can be verified, and a3IB, dr5P  
the higher level geophysical variables, soil moisture and ocean @|A&\a-"J  
salinity, can be validated. In this paper, the overall calibration ;K
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approach is presented, focusing on the main aspects relevant to the z4:09!o_  
SMOS instrument design and mission requirements. The distributed t1s@Ub5);I  
instrument, comprising 72 receivers, leads to a distributed ys6"Q[B  
internal calibration approach supported by specific external calibration urjp&L&  
measurements. The relationship between the calibration Cms"OkN  
data and the routine ground processing is summarized, demonstrating -3U} (cZ*  
the inherent link between them. Finally, the approach to ~x|Sv4M  
the in-flight commissioning activities is discussed. B#
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Index T .. R!xc$`N  
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