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A compact portable resonance probe system for in situ measurements of snow conditions
(Master thesis; Mastergradsoppgave, 2018-01-31)
A resonance probe for measuring the dielectric properties of snow in terms of the resonance frequency is described and tested. The dielectric properties of snow are closely related to the density and the water content in snow. Having a probe capable of measuring the dielectric properties is therefore a useful tool for anyone working with quantitative descriptions of snow properties. In situ measurements ...
Modeling probability density functions of non-negative random variables using novel series expansions based on mellin kind statistics
(Master thesis; Mastergradsoppgave, 2017-05-31)
Mellin kind (MK) statistics is the framework which arises if the Fourier transform is replaced with the Mellin transform when computing the characteristic function from the probability density function. We may then proceed to retrieve logarithmic moments and cumulants, which have important applications in the analysis of heavy-tailed distribution models for non-negative random variables. In this ...
Estimering av egenskaper til naturlige klasser i radarbilder med en blandingsmodell
(Master thesis; Mastergradsoppgave, 2018-05-31)
I løpet av de siste årene har isdekket i polhavet gått fra å være flerårsis til å bli en sesongbasert istype. Hvordan isen utvikler seg på sommeren vil avhenge av smeltevannandelen, blant annet på grunn av at smeltevannet har mindre albedo enn isen. For å estimere andelen smeltevann er det i denne oppgaven utviklet flere metoder som kan brukes på satellittbilder. Disse metodene bruker en statistisk ...
Comparing SAR measurments of natural oil seeps in the Gulf of Mexico with mineral and biological slicks in the North Sea
(Master thesis; Mastergradsoppgave, 2013)
In this thesis, natural oil seeps in Synthetic Aperture Radar (SAR) images are studied. The intension is to
compare seeps to known oil slicks as emulsion-oil, crude-oil and plant-oil. TerraSAR-X and Radarsat-2 data
with these di erent slicks are analyzed. Polarimetric features are extracted for all the scenes, histograms and
scatterplots of values from the slicks are evaluated. Finally a ...
Experimental and numerical estimation of ultrasonic attenuation in polymers based on wave transmission methods
(Master thesis; Mastergradsoppgave, 2013-07-01)
PI-film, also known as Kapton, is a widely used polymer in the production of electronic equipment. Its use in printed circuit boards and sensors is increasing. It is therefore important to have knowledge about ultrasonic attenuation in the polymer.
The main goal of this thesis was to investigate the attenuation of ultrasound through different polymers with different thicknesses. The presentation ...
Particle tracking in 3D
(Master thesis; Mastergradsoppgave, 2013-06)
The evanescent field of an optical waveguide can be used to trap and propel microscopic particles. A 1µm particle is trapped on a strip waveguide and propelled forward until it reaches a 10µm gap at the centre of a loop, created by splitting the waveguide into two branches. According to simulations, the particle will be elevated 3µm in the gap and be stably trapped in the middle of the gap. The goal ...
An initial assessment of the possibilities of fish catch prediction using Gaussian processes
(Master thesis; Mastergradsoppgave, 2016-12-15)
The fishing and aquaculture industry is one of the largest industries of Norway. Enhanced knowledge of the distribution of fish in the ocean is important for an economical and sustainable fishing industry.
This study investigates the possibilities of using Gaussian processes for regression within fish catch prediction. A dataset that combines catch reports from the Norwegian shipping company Havfisk ...
Laser Based Altimetry for Unmanned Aerial Vehicle Hovering Over a Snow Surface
(Master thesis; Mastergradsoppgave, 2017-06-02)
A microwave radar for non-invasive snow stratigraphy measurements has been developed. Results were promising, but it failed to detect light powder snow in the air-snowpack interface. The aim of this thesis is to find and verify a system for estimating altitude on centimeter scale over a snow surface, independent of snow conditions. Also, relative pitch and roll angle estimation between the UAV and ...
A Classification Strategy for Multi-Sensor Remote Sensing Data. An analysis and implementation of Meta-Gaussian classification schemes
(Master thesis; Mastergradsoppgave, 2017-08-18)
In integrated remote sensing, one of the objectives is to create reliable services by combining information from various data sources. The combination of multiple data sources is often denoted "data fusion", and is a topic that has high interest in remote sensing applications. In this thesis, we devise a classification strategy for multi-sensor remote sensing data, based on the strategy presented ...
Reconstruction of the full-polarimetric covariance matrix from compact-polarimetric synthetic aperture radar data with convolutional neural networks
(Master thesis; Mastergradsoppgave, 2017-09-05)
The focus of this thesis is to find an alternative way to reconstruct a pseudo quadrature
polarimetric (quad-pol) covariance matrix from compact polarimetric (compact-pol) data.
In the latest years, the compact polarimetry SAR mode was developed and used more and
more widely. It provides a good compromise between area covered and information content per
pixel [13].
The literature has focused ...