تعيين مدار دقيق كينماتيك ماهواره هاي زمين مدار ارتفاع پايين با مشاهدات HL-SST

Kinematic Precise Orbit Determination for Low Earth Orbit satellites with HL-SST observations

Possibility of three-dimentional measurements with Global Positioning System (GPS), provides one of the most efficient measurement technics for orbit determination of Low Earth Orbiters (LEOs). In this paper, the Kinematic methods have been presented with High-Low Satellite to Satellite Tracking (HL-SST) observations between GPS and LEOs in three sections. We introduce Orbit Determination (OD) methods in particular, the Kinematic Orbit Determination (KOD) as one of the most useful methods. In the first section, we expresse observations equations, linear combination and differential observations equations. It is followed by quantitative aspects of observations and theirs effects on KOD. The last section considers Kinematic Precise Orbit Determination (KPOD) method with phase second differential observations equations. Case studys are observations of HL-SST for GRACE and CHAMP satellites. Finally comparsion between the orbits that have been produced in this study with Rapid Science Orbits (RSO), distribute by GFZ, It shows compatibility at sub-decimeter level of accuracy.