A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
Uncertainty of Radiometer Calibration Loads and Its Impact on Radiometric Measurements
Tekijät: Matti Kaisti, Miikka Altti, and Torsti Poutanen
Kustantaja: IEEE
Julkaisuvuosi: 2014
Journal: IEEE Transactions on Microwave Theory and Techniques
Lehden akronyymi: MTT
Vuosikerta: 62
Numero: 10
Aloitussivu: 2435
Lopetussivu: 2446
Sivujen määrä: 12
ISSN: 0018-9480
DOI: https://doi.org/10.1109/TMTT.2014.2349873
Verkko-osoite: http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=6895175
Rinnakkaistallenteen osoite: https://research.utu.fi/converis/portal/detail/Publication/1993438
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.
Ladattava julkaisu This is an electronic reprint of the original article. |  |
