[仿真]SMOS Calibration

Abstract—The calibration of the Soil Moisture and Ocean &RZO\ZT  
Salinity (SMOS) payload instrument, known as Microwave T&'Jc  
Imaging Radiometer by Aperture Synthesis (MIRAS), is based -H6[{WVW!  
on characterization measurements which are performed initially =6dAF"b)  
on-ground prior to launch and, subsequently, in-flight. A good Qf( A  
calibration is a prerequisite to ensure the quality of the geophysical 6AJk6W^Z  
data. The calibration scheme encompasses both the spaceborne ,<%uG6/",g  
instrument and the ground data processing. Once the system has Ih:Q}V#6  
been calibrated, the instrument performance can be verified, and xkDK5&V  
the higher level geophysical variables, soil moisture and ocean Pj

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salinity, can be validated. In this paper, the overall calibration l'(FM^8jv  
approach is presented, focusing on the main aspects relevant to the JW[6 ^Rw  
SMOS instrument design and mission requirements. The distributed VE
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instrument, comprising 72 receivers, leads to a distributed 61H_o7XXk  
internal calibration approach supported by specific external calibration g&  e u  
measurements. The relationship between the calibration nm1dd{U6^  
data and the routine ground processing is summarized, demonstrating %cSx`^`6j  
the inherent link between them. Finally, the approach to @.-S(MNR  
the in-flight commissioning activities is discussed. X3}eq|r9  
Index .. VG 5*17nf5  
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