ANALYSIS OF ACCURACY AND EFFECTIVENESS OF GPS RECEIVERS UNDER TREE COVER.Author:
MANCEBO QUINTANA SANTIAGO.
Year:
2003.
University:
POLITÉCNICA DE MADRID [
www.upm.es].
Place of defense: E.T.S. INGENIEROS DE MONTES.
Place of preparation: ESCUELA TÉCNICA SUPERIOR DE INGENIEROS DE MONTES.
Summary: In this dissertation addresses the problem of measuring the efficiency and positional accuracy and precision surface and longitudinal GPS receivers under tree cover. &% / Are conducted sampling is a set of static six hours with several receivers GPS several configurations pair filters SNR and PDOP, masses in ten tree species, areas basimétricas, heights and densities varied and in three seasons. In addition, it conducted four samples of 30 hours under the same coverage and a dynamic sampling along a route of 16km. We capture data source C / A and phase L1, generating measures in code C / A code C / A differentially corrected code C / A differentially corrected and softened with phase L1 and phase L1 corrected static. % & / It makes a statistical analysis of the positional errors, including those obtained when and averaged positions, in order to determine the distribution functions in planimetry and altimetry, the temporal correlation, correlation after 12 hours in the constellation of repetition and spatial correlation. Conlos results are obtained formulas that provide the sample sizes in order to determine the accuracy with a certain level of confidence. % & / It analyzes the relationship between the details obtained and receiver, observable, averaged number of positions, filters PDOP and SNR, PDOP and dasométricos parameters of the mass tree. Finally, we get models that provide accuracy before and after the uprising. &% / Simulator is scheduled to make mistakes longitudinal and surface through an iterative calculation methodology, and is a set of simulations variándose the surface perimeter, length, positional accuracy, the number of vertices and distance between the vertices. Furthermore, simulations are performed with actual plots and lines. % & / It makes a statistical analysis of the surface and longitudinal errors in order to determine the function of distribution. % & / It analyzes the relationship between the surface and obtained clarifications, longitude, distance between vertices, number of vertices and positional accuracy. Finally, we get formulas that provide accuracy before and after the levantemiento.
