CIRCLE FITTING FOR IMPROVED GNSS POSITIONING VIA SMARTPHONES FOR ENGINEERING PURPOSES

Earmarking Tobacco Taxes for Health Purposes via Median Entities

Robust Estimation Techniques for GNSS Positioning

Tracking and navigation problems are often solved using estimation methods that are based on least-squares and Kalman filtering techniques. It is well known that these classic methods are sensitive to unexpectedly large measurement errors. In this article we discuss some robust static and dynamic estimation methods that are designed to be insensitive against outlying observations. Positioning s...

Error analysis for circle fitting algorithms

We study the problem of fitting circles (or circular arcs) to data points observed with errors in both variables. A detailed error analysis for all popular circle fitting methods – geometric fit, K̊asa fit, Pratt fit, and Taubin fit – is presented. Our error analysis goes deeper than the traditional expansion to the leading order. We obtain higher order terms, which show exactly why and by how m...

Development of an RTK-GPS Positioning Application with an Improved Position Error Model for Smartphones

This study developed a smartphone application that provides wireless communication, NRTIP client, and RTK processing features, and which can simplify the Network RTK-GPS system while reducing the required cost. A determination method for an error model in Network RTK measurements was proposed, considering both random and autocorrelation errors, to accurately calculate the coordinates measured b...

Improved atmospheric modelling for large scale high-precision positioning based on GNSS CORS networks in Australia

This contribution describes a recent Australian Research Council (ARC) project funded under the ARC-Linkage Scheme. The research team comprises researchers from RMIT University, UNSW, University of Melbourne, Spatial Information Infrastructure and the Department of Lands, NSW. The aim of the project is to enhance the utility of continuously operating reference station (CORS) networks in the sta...