Jämförelse mellan två generationer av GNSS-mottagare tillverkade av Trimble : Mätnoggrannhet i plan och höjd vid användande av nätverks-RTK

Sammanfattning: The use of GNSS has made huge progress over the last few decades and in many cases replaced the use of total stations. A current problem for the GNSS-technique is dense vegetation, which prevents the receivers from making reliable calculations for the satellite signals. In this study a new receiver from Trimble that is said to be able to measure in these particular environments is compared to its predecessor. By assignment from ÅF Karlstad we have therefore conducted a comparison of the new receiver (R12) and its predecessor (R10), to see if R12 to a greater extent than R10 can replace the use of a total station.   The comparison was carried out by repeatedly measuring six different points, totally or partly obstructed by vegetation. To achieve uniform points these where measured with a Realtime Updated Free Station (RUFRIS) and the altitude was balanced from nearby fixed points.   The results where then analyzed by calculating average distance from the known points as well as the maximum dispersion within each respective moment of measurement. The results show that Trimble R12 can conduct reliable measurements in environments where the R10 is not useable. At one of the points the R12 achieved fixed solution where the R10 failed to do so, which is clearly reflected in the results. The results further show a more even and gathered result compared to the R10.   The conclusion of the project is that the R12 constantly performs a better result than the R10 and also enables measurements in environments previously not measurable with GNSS.