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Measurements on Active Cold Loads for Radiometer Calibration

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3 Author(s)
Sobjaerg, S.S. ; Microwave Remote Sensing Sect., Tech. Univ. of Denmark (DTU), Lyngby, Denmark ; Skou, N. ; Balling, J.E.

Two semiconductor active cold loads (ACLs) to be used as cold references in spaceborne microwave radiometers have been developed. An X-band frequency was chosen, and the target noise temperature value was in the 50-100-K range. The ACLs are characterized in the operating temperature range of 0degC-50degC, and long-term stability is assessed. To this end, a test bed has been developed. This test bed is actually a stable radiometer, and its design and performance are discussed. The test setup is described, and test campaign results indicate output temperatures of 77 and 56 K for the two ACLs. The temperature sensitivity is slightly below 0.4 K/degC for the units, and long-term stability within 2 K/year is observed.

Published in:

Geoscience and Remote Sensing, IEEE Transactions on  (Volume:47 ,  Issue: 9 )

Date of Publication:

Sept. 2009

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