The corrections that are obtained from the base station are sent to the rover stations with the help of radio modems. The traditional RTK consists of two components, i.e., the base and rover stations. The kinematic measurement method is divided into two groups: the traditional RTK (real-time kinematic) and the NRTK (network RTK). The NRTK measurements were made with respect to the CORS-TR network. The LBRTK measurements were made depending on the AFKU station that was established at Afyon Kocatepe University.
The objective of this study is comparing the coordinates obtained from LBRTK, NRTK, and long-term static GNSS measurements. For longer distances, differential ionospheric residuals become larger and might hamper the AR process (or, sometimes, make it impossible). ĪR is another important criterion in network RTK solution time. On GNSS networks, most of the modelling algorithms in distance-dependent ionospheric errors are accepted as these errors might be interpolated linearly in other words, their spatial wavelengths are larger than the network station separation. For this reason, the reduction in differential ionospheric effects is one of the most important stages in ambiguity resolution (AR) improvement and, therefore, for accurate medium and long base kinematic positioning. įor short distances (∼10 km, depending on the ionospheric conditions), up to 10 kilometres, a common practice is to neglect the ionospheric effect.
#Network rtk setup with field genius 7.0 mac
NRTK communicates real-time with the control centre of a fixed station network and corrects real-time transmissions with a rover receiver, which is done with computing solutions, such as the VRS (virtual reference stations), MAC (Master Auxiliary Concept), PRS (pseudo reference stations), and FKP (Flächenkorrekturparameter). Real-time LBRTK transmission is made with a rover receiver, and all corrections are computed from one station. On the other hand, with long base real-time kinematic (LBRTK) and network real-time kinematic (NRTK), which is the main subject of this study, the base length of 3-5 km could be expanded to 100 km with short measurement time. Long solution time of ambiguity resolution is a problem for the use of PPP-RTK technique in instant applications requiring high accuracy. Solution of ambiguity resolution quickly and effectively has a big importance for the PPP-RTK technique and several methods have been developed for the solution. In PPP-RTK method, data of the single GNSS receiver are evaluated with different corrections like precise satellite orbits and clocks, ionospheric delays, and satellite phase biases to compute receiver’s position with cm accuracy. With real-time satellite orbit and clock corrections, several PPP services have been developed so far and PPP-RTK is one of the services. Some methods to get accuracy and precision are long base real-time kinematic (LBRTK), network real-time kinematic (NRTK), and precise point positioning real-time kinematic (PPP-RTK). The RTK method, using the differential GNSS technique, is based on network principle and serving quick and practical measurements. Nowadays, it is possible to get accurate and precision coordinates anywhere in seconds thanks to GNSS technology. The study results showed that the LBRTK and NRTK methods yielded similar results at base lengths up to 40 km with the differences less than 3 cm horizontally and 4 cm vertically. The results of NRTK and LBRTK methods were examined and compared with all relevant aspects by considering the results of the static measurements as real coordinates. Repetitive NRTK and LBRTK measurements were performed on 6 different days in 2015-2017-2018 and additionally 4 campaigns of repetitive static measurements were carried out in this test network. In the present study, the NRTK and LBRTK measurements were compared in terms of accuracy and distance in a test network with 6 sites that was established between 5 and 60 km. NRTK and LBRTK are popular with the advantage of the distance, the time, and accuracy. There are several RTK methods used today such as the traditional RTK, long base RTK (LBRTK), network RTK (NRTK), and precise point positioning RTK (PPP-RTK). Real-time kinematic (RTK) technique is important for mapping applications requiring short measure time, the distance between rover and base station, and high accuracy.