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Found 5 essays matching the above criteria.

  1. 1. Estimation of satellite orbits using ground based radar concept

    University essay from Umeå universitet/Institutionen för fysik

    Author : Jonas Gabrielsson; [2021]
    Keywords : ;

    Abstract : Today an abundance of objects are circulating in earth captured orbit. Monitoring these objects is of national security interest. One way to map any object in orbit is with their Keplerian elements. A method for estimating the Keplerian elements of a satellite orbit simulating a ground based radar station has been investigated. READ MORE

  3. 2. A Comparison of Three Methods of Estimation Applied to Contaminated Circular Data

    University essay from Umeå universitet/Statistik

    Author : Anton Brännström; [2018]
    Keywords : ;

    Abstract : This study compares the performance of the Maximum Likelihood estimator (MLE), estimators based on spacings called Generalized Maximum Spacing estimators (GSEs), and the One Step Minimum Hellinger Distance estimator (OSMHD), on data originating from a circular distribution.  The purpose of the study is to investigate the different estimators’ performance on directional data. READ MORE

  4. 3. A Study of Gradient-Based Algorithms

    University essay from Lunds universitet/Matematisk statistik

    Author : Rasmus Hallén; [2017]
    Keywords : Mathematics and Statistics;

    Abstract : Gradient-based algorithms are popular when solving unconstrained optimization problems. By exploiting knowledge of the gradient of the objective function to optimize, each iteration of a gradient-based algorithm aims at approaching the minimizer of said function. READ MORE

  5. 4. The unweighted mean estimator in a Growth Curve model

    University essay from Linköpings universitet/Matematisk statistik; Linköpings universitet/Tekniska fakulteten

    Author : Emil Karlsson; [2016]
    Keywords : Growth Curve model; maximum likelihood; eigenvalue inequality; un-weighted mean estimator; covariance matrix; circular symmetric Toeplitz; intra-class; generalized intraclas;

    Abstract : The field of statistics is becoming increasingly more important as the amount of data in the world grows. This thesis studies the Growth Curve model in multivariate statistics which is a model that is not widely used. One difference compared with the linear model is that the Maximum Likelihood Estimators are more complicated. READ MORE

  6. 5. Multiantenna Time Of Arrival Estimation

    University essay from KTH/Signalbehandling

    Author : Ferran Torrent Fontbona; [2011]
    Keywords : ;

    Abstract : In the communications literature exist many documents that explain how to use spatial diversity to improve the performance of the system. However, the use of spatial diversity has not been studied in depth for GNSS, although in the last years the subject has received some interest, [6] and [20]. READ MORE