[仿真]SMOS Calibration

Abstract—The calibration of the Soil Moisture and Ocean I}t#%/'YA  
Salinity (SMOS) payload instrument, known as Microwave .B\5OI,]  
Imaging Radiometer by Aperture Synthesis (MIRAS), is based Pcw6!xH  
on characterization measurements which are performed initially lIProF0  
on-ground prior to launch and, subsequently, in-flight. A good e/^=U7:io  
calibration is a prerequisite to ensure the quality of the geophysical _vZ"4L+Iw+  
data. The calibration scheme encompasses both the spaceborne SXy=<%ed  
instrument and the ground data processing. Once the system has ,dx3zBI  
been calibrated, the instrument performance can be verified, and /"B?1?qc,=  
the higher level geophysical variables, soil moisture and ocean 5:kH;/U  
salinity, can be validated. In this paper, the overall calibration 0$-xw  
approach is presented, focusing on the main aspects relevant to the HvVts\f  
SMOS instrument design and mission requirements. The distributed El@(mOu|  
instrument, comprising 72 receivers, leads to a distributed d$ ^ ,bL2p  
internal calibration approach supported by specific external calibration =dFv/F/RW  
measurements. The relationship between the calibration T8HF|%I  
data and the routine ground processing is summarized, demonstrating X@f "-\  
the inherent link between them. Finally, the approach to l~M_S<4n  
the in-flight commissioning activities is discussed. 3}/&w\$  
Index .. }oNhl^JC  
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