Differential GPS Positioning: DGPS Modelling Using Pseudo Range Observations

摘要

Proper stochastic and functional modeling of pseudo ranges is essential for theuse of quality control parameters. This thesis is concerned with the verification of the commonly used pseudo range stochastical and functional models. At five different baselines a large number of pseudo range observations has been performed. Some empirical results from these measurements are checked against their theoretical expectations. The following comparisons have been made: empirical positions/baselines against known positions/baselines; empirical and theoretical variances/covariances; empirical and theoretical distributions of positions, w-tests and F-tests; time correlation of pseudo range observations, positions and w-tests (modeling assumes no time correlation present). The measurements have been performed at five known baselines, ranging from 3 meter up to 200 km. The relation between baseline length and the above comparisons has been investigated.