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Development and testing of a numerical method designed for evaluating the performance of a polarimetric microwave radiometer
2002 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This work evaluates a method designed to improve the performance of a po- larimetric microwave radiometer. A research group at the University of Michigan developed this method to be further investigated. Polarimetric microwave radi-ometers are very sensitive to errors in its hardware and its ocean emission model so in order to have reliable measurements a good calibration of the instrument is required. This paper attempts to improve the calibration of such an instrument. It involves using stationary statistics of the prevailing trade winds over the ocean to simulate the performance of the radiometer. The model in this paper will intro-duce inaccuracies to simulate errors in the ocean emission model and in the hard- ware. Isolating one error at a time and taking the difference between the histo-grams of the statistics of the brightness temperature from a perfect instrument and the statistics of the brightness temperature from the instruments with a fault will give a picture of whether it will be possible to see a signal or if it is hidden in the statistical changes of the brightness temperature from year to year. The results shows that it will be a good technique for detecting and correcting hardware errors due to cross contamination in the antenna if the field transformation coefficients are set to have a phase of 45 or 135 degrees. It will not be able to correct any er-rors if the angle would have a significantly different value but it would still be able to distinguish a hardware error from an error in the ocean emission model. The method will not be able to detect any ocean emission model errors or any noise distortions in the antenna. The changes in the brightness temperature due to the non-stationary statistics will hide these signals but this also implies that if a signal would appear when using this method it would be because of an error in the hardware.

Place, publisher, year, edition, pages
Keyword [en]
Physics Chemistry Maths, polarimetric, radiometer, brightness temperature, statistics, calibration, WindSat, numerical method
Keyword [sv]
Fysik, Kemi, Matematik
URN: urn:nbn:se:ltu:diva-55819ISRN: LTU-EX--02/372--SELocal ID: ca306b72-37bf-44f4-9fbc-19e52d6edbc8OAI: diva2:1029203
Subject / course
Student thesis, at least 30 credits
Educational program
Space Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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