Geographia Technica, Vol 20, Issue 1, 2025, pp. 1-10
HEADING DETERMINATION ANALYSIS USING ORBIT AND TIME PRODUCTS FROM THE QUASI-ZENITH SATELLITE SYSTEM (QZSS): PRELIMINARY RESULTS
Irwan GUMILAR 
, Erza Irdana RAMADHAN , Brian BRAMANTO , RAHAYU LESTARI , Wiwin WINDUPRANATA , Teguh Purnama SIDIQ , Hasanuddin Zainal ABIDIN , Surono SURONO
ABSTRACT: The Quasi-Zenith Satellite System (QZSS) is a Global Navigation Satellite System (GNSS) technology owned by the Japanese government, with satellites orbiting and operating in Indonesian territory. Positioning activities using QZSS satellites employ the Real-Time Precise Point Positioning (RT-PPP) method to achieve precise positioning, correcting orbit, and clock errors directly from QZSS satellites. Currently, the Magellan System Japan (MSJ) receiver is equipped with the capability to receive precise orbit and clock corrections, enabling it to determine heading using QZSS satellites. This research aims to evaluate the precision of heading data estimated with precise clock and orbit corrections from QZSS satellites. To address this, we conducted heading data acquisition using static and kinematic MSJ receivers with precise orbit and clock corrections from QZSS. The heading data obtained from these methods were compared to data obtained using various other observation techniques, including static GNSS and real-time positioning with Omnistar correction, and total station measurements. Comparing the results of QZSS MADOCA (Multi-GNSS Advanced Data and Orbit Calculation), static GNSS, and total station static heading measurements revealed that the precision levels achieved by QZSS MADOCA measurements were higher when conducted over longer baselines. The highest precision value for QZSS MADOCA heading measurements was obtained with a 10-meter baseline, measuring at 0.014º, followed by measurements at 8 m, 2 m, and 1 m baselines, which yielded precision values of 0.016º, 0.058º, and 0.074º, respectively. Furthermore, the precision of QZSS MADOCA heading measurements compared to static GNSS reached 0.0004º for a 10-meter baseline. In the kinematic positioning, QZSS MADOCA heading values exhibited a precision range of 0.1658º to 1.1798º when compared to heading data obtained from Omnistar correction. In conclusion, the results indicate that heading determination using precise orbit and time corrections from QZSS MADOCA can be effectively utilized in hydrographic surveys.
Keywords: QZSS, Performance, RT-PPP, Indonesia, MADOCA, Correction
Full article here