5:15 PM - 6:45 PM
[SGD01-P10] Verification of real-time precise positioning using an inexpensive and easy-to-handle networked multi-frequency RTK-GNSS system
Keywords:RTK-GNSS, continuous real-time positioning, precise positioning, ZED-F9P
Continuous real-time positioning at multiple locations on the ground with a centimeter accuracy facilitates the monitoring of crustal movement, which helps predict the occurrence of disasters such as landslides and provides valuable data regarding seismic and volcanic activities. GEONET, which was established by the Geospatial Information Authority of Japan (GSI), is spaced at intervals of approximately 20 km, which limits the range of phenomena that can be monitored. Thus far, because of the high cost of surveying equipment required to achieve a centimeter accuracy, existing GNSS receivers with an accuracy of several meters have been used for high-density positioning. Real-time positioning with a centimeter accuracy and high density could provide valuable scientific data as well as facilitate the monitoring of seismic and volcanic activity.
In the past few years, inexpensive (several tens of thousands of yen) receivers capable of real-time, cm-accurate positioning using GNSS have been developed and released by ublox and other companies in the United States. However, since they cannot be used in the received state, the necessary equipment must be supplemented and set up by the receiving organization . Modularized or packaged receivers are also available, but they are more expensive and have a fixed data output format, which limits their use.
Shinmura and Nasu (2020, 2021) explored an inexpensive, easy, and flexible method of data acquisition by combining a small and inexpensive Raspberry Pi and other commonly available devices with ublox's single-frequency RTK receiver (NEO-M8P). It was found that networked RTK using a combination of reference and mobile stations could achieve stable, long-term, centimeter-accurate real-time positioning. Shinmura and Nasu (2022, 2023) investigated factors other than GNSS satellite signal reception environment that affect the positioning accuracy in real-time positioning with this system and reported countermeasures.
In this study, we developed a networked RTK-GNSS system using two or more radio frequencies that can operate under poor reception conditions such as a small number of GNSS satellites and multiple paths and can be easily implemented at a low cost. We also verified the performance of the system . ZED-F9P from ublox was used. For comparison, continuous positioning was performed by placing mobile stations at two locations, one on the roof of a school building with good reception and the other between two school buildings in a campus.
In the past few years, inexpensive (several tens of thousands of yen) receivers capable of real-time, cm-accurate positioning using GNSS have been developed and released by ublox and other companies in the United States. However, since they cannot be used in the received state, the necessary equipment must be supplemented and set up by the receiving organization . Modularized or packaged receivers are also available, but they are more expensive and have a fixed data output format, which limits their use.
Shinmura and Nasu (2020, 2021) explored an inexpensive, easy, and flexible method of data acquisition by combining a small and inexpensive Raspberry Pi and other commonly available devices with ublox's single-frequency RTK receiver (NEO-M8P). It was found that networked RTK using a combination of reference and mobile stations could achieve stable, long-term, centimeter-accurate real-time positioning. Shinmura and Nasu (2022, 2023) investigated factors other than GNSS satellite signal reception environment that affect the positioning accuracy in real-time positioning with this system and reported countermeasures.
In this study, we developed a networked RTK-GNSS system using two or more radio frequencies that can operate under poor reception conditions such as a small number of GNSS satellites and multiple paths and can be easily implemented at a low cost. We also verified the performance of the system . ZED-F9P from ublox was used. For comparison, continuous positioning was performed by placing mobile stations at two locations, one on the roof of a school building with good reception and the other between two school buildings in a campus.