Leistungsanalysen bei DGPS-Ortungssystemen im landwirtschaftlichen Langzeiteinsatz

For investigating the long-term availability, continuity and positioning accuracy of the Global Positioning System two vehicles were equipped with two different DGPS-receivers and PCs for data logging. During periods of five and seven months the performance tests were carried out. The results show that system based changes in the space constellation of the satellites and signal shading are causing a decrease of the positioning accuracy and sometimes an interruption of the positioning. For these cases a back-up system (e.g. dead reckoning) is required.