Real-Time Precise Orbit Determination for LEO between Kinematic and Reduced-Dynamic with Ambiguity Resolution

The real-time integer-ambiguity resolution of the carrier-phase observation is one most effective approaches to enhance accuracy precise point positioning (PPP), kinematic orbit determination (KPOD), and reduced-dynamic (RPOD) for low earth (LEO) satellites. In this study, integer phase clock (IPC) wide-lane satellite bias (WSB) products from CNES (Centre National d’Etudes Spatiales) are used fix ambiguity in real time. Meanwhile, three models PPP, KPOD, RPOD applied validate contribution resolution. Experimental results show that (1) average IGS stations ambiguity-fixed solutions improved about 7.14 5.91 cm, with an improvement around 17% compared float PPP solutions, enhancement east-west direction particularly significant, 29%; (2) estimated LEO KPOD mode by 16% 10%, respectively, respect corresponding ambiguity-float solutions; (3) performance better than regardless fixed- or float-ambiguity solutions. Moreover, ratio can reach more 90% RPOD.