Zu jeder Zeit an jedem Ort-Studie zur Verfügbarkeit und Genauigkeit von GPS-Echtzeitmessungen im SAFOS-Service HEPS

摘要

On the basis of an extensive study the availability and ac-curacy of the SAPOS-reo/ tirne Service HEPS is investigated, using two concepts of networking, namely "area correction Parameters" (FKP) and "Virtual reference Station" (VRS). Parameters for the availability are the time to connect (TTC) with GSM to the SkPOS-centre of Baden-Württemberg in Karlsruhe as well as the required time to solve the ambiguities (TTFA). Conclusions about the accuracy achieved with the Leica SRS30 GPS equipment are made with respect to the distanceto the nearest reference Station, the observation time and the required time for solving the ambiguities. The posi-tioning accuracy of 1-2 cm required for the SkPOS-service HEPS using networking concepts has been fully achieved for shorter distances to the nearest reference Station, while the accuracy decreases to about 5 cm for a distance of about 30 km. With increasing distance to the nextSkPOS-reference Station the VRS conceptshows advantages with respect to the FKP concept Another result of the present study is that a poor accuracy is more likely if the TTFA is longer than 30 s.