[仿真]SMOS Calibration

Abstract—The calibration of the Soil Moisture and Ocean zN-Y=-c  
Salinity (SMOS) payload instrument, known as Microwave bBGg4{  
Imaging Radiometer by Aperture Synthesis (MIRAS), is based IMpL+W.  
on characterization measurements which are performed initially ~SsfkM"  
on-ground prior to launch and, subsequently, in-flight. A good .SOCWznb  
calibration is a prerequisite to ensure the quality of the geophysical #'RfwldD9  
data. The calibration scheme encompasses both the spaceborne T]b&[?p|a[  
instrument and the ground data processing. Once the system has P\z1fscnK  
been calibrated, the instrument performance can be verified, and g9d/nRX&  
the higher level geophysical variables, soil moisture and ocean
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salinity, can be validated. In this paper, the overall calibration !<b+7A  
approach is presented, focusing on the main aspects relevant to the Uv=)y^H~*A  
SMOS instrument design and mission requirements. The distributed h53G$Ol
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instrument, comprising 72 receivers, leads to a distributed */$]k
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internal calibration approach supported by specific external calibration 9[`\ZGWD  
measurements. The relationship between the calibration MiF( &#  
data and the routine ground processing is summarized, demonstrating `FX?P`\@I  
the inherent link between them. Finally, the approach to w]
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the in-flight commissioning activities is discussed. O<dCvH  
Index T .. ]+tO  
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