Performance Assessment of GNSS Augmentation System Using Quasi-Zenith Satellite System for Real-time Precise Positioning Method in Indonesia

The Quasi-Zenith Satellite System (QZSS) is one of the GNSS technologies owned by the Japanese government, which orbits around East Asia, Asia Pacific, and Oceania. One of the advantages of the QZSS satellite is that it corrects the measurements using precise ephemeris, clock, and other augmenting corrections, and is primarily used for the Real-Time Precise Point Positioning (RTPPP) method. This study aimed to examine the QZSS system\u27s performance for RTPPP measurements in Indonesia. Magellan System Japan\u27s (MSJ) receiver was applied to collect the GNSS and the augmenting data to perform the RTPPP. RTPPP method was then made into the static and kinematic scheme. Various methods were also carried out on each method, such as static, Real-Time Kinematic (RTK), and other RTPPP providers. The result is that the precision level of the RTPPP method for the static scheme using the QZSS augmentation could give precision up to 5 cm in the open sky condition. Similar to other RTPPP correction providers, QZSS-RTPPP took approximately 20 minutes for the initiation process. The Accuracy of QZSS-RTPPP reached approximately 20 cm caused by the epoch reference for the actual coordinate was in epoch 2012.0, while the RT-PPP observations were occupied in 2019. The precision and accuracy level of QZSS-RTPPP tend to be more unstable in light and heavy obstructed conditions. In the measurements against 20 benchmarks at ITB Jatinangor, the accuracy value for the QZSS-RTPPP ranged from 5-40 cm. The RTPPP QZSS method\u27s average accuracy for the easting, northing, and height components, respectively, was 0.110 m, 0.056 m, and 0.120 m. Utilizing the QZSS RTPPP measurements at sea for the moving platform, the obtained horizontal component precision level was between 10 and 20 cm. On the other hand, the overall precision for QZSS RTPPP measurement over the land region for the moving platform was lower than one meter for horizontal components, while the vertical component was lower than two meters