The article presents sample results of simulations regarding the impact of terrain obstacles on the accuracy of GNSS (Global Navigation Satellite Systems) positioning. The assumptions for the simulations, the model of terrain obstacles, and the conclusions drawn from the conducted research are described. The simulations were carried out using proprietary software.1. INTRODUCTION
Since the announcement of the full operational capability of the GPS system in 1995, we have observed an avalanche growth in satellite navigation applications in various sectors of the economy, including transport. As a result of the emergence of differential augmentation systems and work on the reactivation of the Russian GLONASS and the construction of the European Galileo and Chinese
COMPASS systems, the acronym GNSS (Global Navigation Satellite Systems) began to function in the satellite navigation environment, covering all positioning solutions based on satellite navigation systems.
The process of navigation using GNSS does not always take place in open space.
In urban agglomerations, in the mountains, or in forested areas, part of the celestial sphere is obscured by broadly defined obstacles. On one hand, they cause a deterioration of observation conditions (some satellites are obscured), and on the other, some objects such as buildings can reflect satellite signals and cause errors in measuring the distance to satellites. Both phenomena negatively affect the accuracy of GNSS positioning and can make position errors dozens of times larger than those observed in open space. (…)
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Source: Logistyka Magazine