A1 Journal article – refereed
Uncertainty of Radiometer Calibration Loads and Its Impact on Radiometric Measurements




List of Authors: Matti Kaisti, Miikka Altti, and Torsti Poutanen
Publisher: IEEE
Publication year: 2014
Journal: IEEE Transactions on Microwave Theory and Techniques
Journal acronym: MTT
Volume number: 62
Issue number: 10
Number of pages: 12
ISSN: 0018-9480

Abstract

We present an uncertainty analysis of radiometer calibration.


The procedure can be used to determine the uncertainty


in the nominal brightness temperature of the unknown scene. A


total power radiometer requires frequent calibration with known


reference loads that are connected to the radiometer. Our analysis


includes uncertainties from the radiometer calibration loads and


from the connecting network (CN) that is required to multiplex


calibration loads and scene to the radiometer input. We show the


design and analysis of three calibration loads and how their uncertainties


propagate from load terminals to the radiometer calibration


plane and to the scene. All three loads, including a cryogenic


load, are simple, inexpensive, and show great stability and


accuracy. We give an uncertainty calculation example for our three


calibration loads and for the CN. We validate our model and the


long-term stability of the loads through measurements. The analysis


is done at 52 GHz, but the analysis and the construction of the


loads are generic and easily scalable to other frequencies.

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Last updated on 2019-20-07 at 11:29