Analysis of Precise Orbit Determination for the HY2D Satellite Using Onboard GPS/BDS Observations

High-precision orbits of Low Earth Orbit (LEO) satellites are essential for many scientific applications, such as assessing the change in current global mean sea level, estimating coefficients gravity field, and so on. How to determinate high-precision LEO has gradually become an important research focus. HY2D is a new altimetry satellite China, which equipped with Global Positioning System (GPS) third generations BeiDou Navigation Satellite (BDS-3) order guarantee reliability orbital precision radar mission. Therefore, this study adopts one month spaceborne data conduct precise orbit determination (POD) satellite. Our analysis results are: (1) The standard deviation residuals based on BDS GPS 9.12 mm 8.53 mm, respectively, there no significant systematic errors these residuals. (2) comparison Doppler Orbitography Radio-positioning Integrated by (DORIS)-derived indicate that satellite, using data, can achieve radial accuracy 1.4~1.5 cm, three-dimensional (3D) 5.3 cm 4.3 satisfy applications. (3) By means laser ranging (SLR), (GNSS)-derived approximately 3.3 reflects model strategies reliable.