Validating Precise Orbit Determination from Satellite-Borne GPS Data of Haiyang-2D

Haiyang-2D (HY-2D) is the fourth satellite in marine dynamic series established by China. It was successfully launched on 19 May 2021, marking era of 3-satellite network environment The satellite’s precision orbit determination (POD) and validations are great significance for ocean warning altimetry missions. HY-2D equipped with a laser reflector array (LRA), satellite-borne Doppler Orbitography Radiopositioning Integrated Satellite (DORIS) receiver, dual-frequency GPS receiver named HY2 that independently developed In this paper, quality data collected analyzed based indicators such as multipath effect, cycle slips, completeness. results suggest can be used POD missions involving low-Earth-orbit (LEO) satellites. precise orbits determined reduced-dynamics (RD) method. Apart from POD, validation accuracy another important task LEO POD. Therefore, two external methods proposed, including carrier differential using one inter-satellite These space-borne carrier-phase data, satellites do not participate determination. SLR range cannot illustrate x, y, z directions particularly, so to make more intuitive, three-dimensional (3D) proposed validation, RMSs 2.66, 3.32, 2.69 cm, respectively. 3D same those which proves new method provided reliable. 0.68 1.06 proved