5:15 PM - 6:30 PM
[SGD01-P03] Evaluation Performance of QZSS Centimeter Level Augmentation Service (CLAS) with long-term field observations
Keywords:QZSS, CLAS
QZSS (Michibiki) in a four-satellite constellation has been in official operation since November 2018. The Centimeter Level Augmentation Service (CLAS) is one of the QZSS services to accomplish positioning with an error of several centimeters almost all over Japan by using transmitted centimeter level augmentation information based on observation data from GEONET, Japan’s nationwide network of GNSS CORS. The Geospatial Information Authority of Japan (GSI) examines the performance of CLAS positioning with field observation and observation data of GEONET.
In FY2020, GSI carried out real-time CLAS positioning measurements with CLAS receivers (AQLOC-VCX, Chronosphere-L6, MJ-3008-GM4-QZS) in 3 areas (Hokkaido, Tokyo, Okinawa) for 3 months. The examinations are evaluated with TTFF and comparison with National Geodetic Datum of the CLAS positioning.
The results show that almost all of them satisfied the CLAS specification positioning accuracy (horizontal 6cm and vertical 12cm in terms of 95 % probability range). On the other hand, there occasionally existed epochs which positioning results were unstable or miss FIX. The positioning results at Okinawa area were unstable compared with the other areas, and there existed systematic error to National Geodetic Datum on vertical components.
In FY2020, GSI carried out real-time CLAS positioning measurements with CLAS receivers (AQLOC-VCX, Chronosphere-L6, MJ-3008-GM4-QZS) in 3 areas (Hokkaido, Tokyo, Okinawa) for 3 months. The examinations are evaluated with TTFF and comparison with National Geodetic Datum of the CLAS positioning.
The results show that almost all of them satisfied the CLAS specification positioning accuracy (horizontal 6cm and vertical 12cm in terms of 95 % probability range). On the other hand, there occasionally existed epochs which positioning results were unstable or miss FIX. The positioning results at Okinawa area were unstable compared with the other areas, and there existed systematic error to National Geodetic Datum on vertical components.