Research on Precise Orbit Determination Using Onboard GPS Data of HY2D Satellite

Subjects: Astronomy submitted time 2024-01-05 Cooperative journals: 《天文学进展》

TAO En-zhe, ZHOU Xu-hua, XU Ke-xin, QU-Wei jin, LI Duo-duo, LI Kai

Abstract： The quality and orbit determination accuracy of the primary and backup on#2;board GNSS receivers were studied by using the HY2D satellite’s primary and backup GNSS receiver data from June 1 to 14 and June 19 to 27, 2021 based on reduced-dynamic method. The results showed that: (1) The RMS average values of the phase fitting residuals of the main and backup onboard GPS data were 6.9 mm and 8.2 mm, respectively. (2) The radial difference of the main receiver for a 4-hour arc overlap orbit was 0.2 cm, while the three#2;dimensional position differences was 0.6 cm. The radial difference of the backup receiver was 0.3 cm, while the three-dimensional position difference was 1.7 cm, indicating slightly larger differences from the backup receiver results. (3) The orbit determination accuracies of the primary and backup receivers were verified using precise orbit products provided by CNES, with average radial differences of 0.8 cm and 1.2 cm respectively. (4) The orbit determina#2;tion accuracies of the primary and backup receivers were also verified using observation data from global SLR core stations with elevation angles greater than 20◦ , with the RMS range residuals of 1.51 cm and 2.44 cm. It can be seen that the main and backup dual-frequency GNSS receivers carried by the HY2D satellite can meet the satellite’s centimeter-level radial orbit determination requirements.

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