%0 Generic %1 Hadas_IAG2021_positioninig %A Hadas, Tomasz %A Wielgocka, Natalia %A Kaczmarek, Adrian %A Marut, Grzegorz %D 2021 %K myown from:tomasz.hadas %T Precise positioning using low-cost dual-frequency GNSS receivers %U https://youtu.be/WHm-kuTn6MU %X Global Navigation Satellite Systems (GNSS) allow for determining position coordinates with centimeter-level precision in real-time or up to sub-millimeter accuracy in post-processing solutions. The relative positioning, including the Real-Time Kinematic (RTK) or Network RTK (NRTK) modes, and the absolute positioning, dominated by the Precise Point Positioning (PPP) technique, are commonly used in positioning application. High accuracy positioning takes advantage of carrier phase measurements, whereas PPP and long-baseline RTK requires the acquisition of two frequencies. Although for many years such features were limited to geodetic-grade receivers, low-cost multi-frequency receivers have become available on the market recently. The positioning performance declared by the manufacturers is impressive, but initial studies reported, that it is limited to a favorable environment. In this contribution, we evaluate a low-cost dual-frequency multi-GNSS receiver and low-cost antenna in terms of the signal acquisition performance and positioning accuracy under RTK, NRTK and PPP. Signal acquisition is on average 7 dB Hz weaker than with a geodetic-grade receiver and is unsatisfactory for elevation angles lower than 10°. In open-sky conditions, a 1-hour long static session allows us to achieve horizontal accuracy of few centimeters and 80% fixed ambiguities and a similar accuracy can be achieved with the PPP for a session length of 2.5 hours. We notice a distinct disagreement between positioning accuracy and estimated uncertainty, which we justify by the stochastic modeling, which is not tuned for measurements performed by a low-cost receiver. With RTK (with geodetic grade base-station) and Network RTK, we achieve horizontal and vertical accuracy better than 5 cm and 8 cm, respectively. However, in the RTK between two low-cost receivers, the change of relative antenna orientation results in height determination errors exceeding 10 cm.

@conference{Hadas_IAG2021_positioninig, abstract = {Global Navigation Satellite Systems (GNSS) allow for determining position coordinates with centimeter-level precision in real-time or up to sub-millimeter accuracy in post-processing solutions. The relative positioning, including the Real-Time Kinematic (RTK) or Network RTK (NRTK) modes, and the absolute positioning, dominated by the Precise Point Positioning (PPP) technique, are commonly used in positioning application. High accuracy positioning takes advantage of carrier phase measurements, whereas PPP and long-baseline RTK requires the acquisition of two frequencies. Although for many years such features were limited to geodetic-grade receivers, low-cost multi-frequency receivers have become available on the market recently. The positioning performance declared by the manufacturers is impressive, but initial studies reported, that it is limited to a favorable environment. In this contribution, we evaluate a low-cost dual-frequency multi-GNSS receiver and low-cost antenna in terms of the signal acquisition performance and positioning accuracy under RTK, NRTK and PPP. Signal acquisition is on average 7 dB Hz weaker than with a geodetic-grade receiver and is unsatisfactory for elevation angles lower than 10°. In open-sky conditions, a 1-hour long static session allows us to achieve horizontal accuracy of few centimeters and 80% fixed ambiguities and a similar accuracy can be achieved with the PPP for a session length of 2.5 hours. We notice a distinct disagreement between positioning accuracy and estimated uncertainty, which we justify by the stochastic modeling, which is not tuned for measurements performed by a low-cost receiver. With RTK (with geodetic grade base-station) and Network RTK, we achieve horizontal and vertical accuracy better than 5 cm and 8 cm, respectively. However, in the RTK between two low-cost receivers, the change of relative antenna orientation results in height determination errors exceeding 10 cm.}, added-at = {2021-07-21T10:36:04.000+0200}, author = {Hadas, Tomasz and Wielgocka, Natalia and Kaczmarek, Adrian and Marut, Grzegorz}, biburl = {https://puma.ub.uni-stuttgart.de/bibtex/275aa99e83e43de7c62c1bff47fb64904/ins}, eventdate = {June 28–July 2, 2021}, eventtitle = {Scientific Assembly of the International Association of Geodesy (IAG)}, interhash = {65ed8ae6b01cd9d3175ff1667aed9201}, intrahash = {75aa99e83e43de7c62c1bff47fb64904}, keywords = {myown from:tomasz.hadas}, timestamp = {2021-07-21T08:36:04.000+0200}, title = {Precise positioning using low-cost dual-frequency GNSS receivers}, url = {https://youtu.be/WHm-kuTn6MU}, venue = {Beijing, China}, year = 2021 }