| This dissertation investigates errors on the pseudorange observable due to earth-surface induced multipath reflections. This research is important to Differential Global Positioning System (DGPS) users since multipath at the ground reference site is the major source of error. The theory used to develop this model is described. The model is then verified with real GPS data for various surfaces. The verification procedure was designed such that it could test the model's ability to predict the amplitude, phase, and phase-rate-of-change for multipath reflections from various media. Furthermore, the model was subjected to various antenna polarizations. This research provides a database of measured multipath errors from various surfaces that may be encountered at a DGPS ground reference site. |
