Essays about: "propagator"

Showing result 1 - 5 of 16 essays containing the word propagator.

  1. 1. Constellation Optimization using Genetic Algorithm : Combining SAR & Optical Sensors with AI Requirements

    University essay from KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Author : Adrian Pellnäs; [2023]
    Keywords : Satellite Constellation Design; Satellite Constellation Optimization; AI - Artificial Intelligence; Synthetic Apterture Radar; Dual-axis; RegionalCoverage Analysis; Satellitkonstellationsdesign; Optimering av satellitkonstellationer; AI - Artificiell Intelligens; Syntetisk Apertur Radar; Dual-axis; Analys avregional täckning;

    Abstract : With increasing world tensions and improvements of satellites and their sensors, the interest and possibility of using space and satellites for defensive purposes has increased greatly. However, not much research has been conducted into the needs and possibilities of satellite constellations over Sweden, especially using SAR and optical sensors combined with AI object detection. READ MORE

  3. 2. Optimal Q-Space Sampling Scheme : Using Gaussian Process Regression and Mutual Information

    University essay from Uppsala universitet/Avdelningen för systemteknik

    Author : Ture Hassler; Jonathan Berntsson; [2022]
    Keywords : AI; Machine learning; Gaussian process; Gaussian process regression; MRI; dMRI; q-space; sampling; statistics; information theory; mutual information; entropy; pytorch; gpytorch;

    Abstract : Diffusion spectrum imaging is a type of diffusion magnetic resonance imaging, capable of capturing very complex tissue structures, but requiring a very large amount of samples in q-space and therefore time.  The purpose of this project was to create and evaluate a new sampling scheme in q-space for diffusion MRI, trying to recreate the ensemble averaged propagator (EAP) with fewer samples without significant loss of quality. READ MORE

  4. 3. Networked Model Predictive Control for Satellite Formation Flying

    University essay from Luleå tekniska universitet/Rymdteknik

    Author : Damiana Catanoso; [2019]
    Keywords : Satellite Formation Flying; Model Predictive Control;

    Abstract : A novel continuous low-thrust fuel-efficient model predictive control strategy for multi-satellite formations flying in low earth orbit is presented. State prediction relies on a full nonlinear relative motion model, based on quasi-nonsingular relative orbital elements, including earth oblateness effects and, through state augmentation, differential drag. READ MORE

  5. 4. A Diagrammatic Study of Gauge and Gravity Amplitude Relations

    University essay from Uppsala universitet/Teoretisk fysik

    Author : Micah Tegevi; [2018]
    Keywords : ;

    Abstract : We review modern methods of scattering amplitude computations, beginning with color-decomposition that decomposes the amplitude into a color-dependentand a color-independent part of partial color-ordered amplitudes. We then show how a full amplitude can be described through the color-factor, propagator structure, and kinematic numerator of cubic color-ordered diagrams. READ MORE

  6. 5. Analysis of Proportional Navigation Guidance Algorithms in the Context of a Near-Earth Object Intercept Mission

    University essay from Luleå tekniska universitet/Rymdteknik

    Author : Matteo Clark; [2018]
    Keywords : Planetary Defense; Guidance Algorithms; Spacecraft Design;

    Abstract : An impact of a Near-Earth Object with the Earth is rare but possible, and can have negative consequences ranging from localized annoyance and injury to global devastation and the end of the world as we know it. Considering the magnitude of the consequences and the lack of an ability to respond to such a threat, it is important that these Planetary Defense capabilities are developed. READ MORE