PRECISE ESTABLISHMENT OF THE NEXT-GENERATION EARTH GRAVITY FIELD MODEL FROM HIP-3S BASED ON COMBINATION OF INLINE AND PENDULUM SATELLITE FORMATIONS

Because the sensitivity of the disturbing intersatellite range measurements to the recovery accuracy of the Earth's gravitational field is superior to that of the intersatellite range measurements, the observation equation of a new Disturbing Intersatellite Range Method (DIRM) is created in this study. Then the orbital stability of the next-generation Hybrid-Inline-Pendulum-Three-Satellite (HIP-3S) formation is efficiently verified. The research results indicate that the HIP-3S formation is sufficiently steady for further enhancing the accuracy of the future Earth gravity field model. Finally, the Earth's gravitational field complete up to degree and order 120 is precisely recovered by the current GRACE-2S inline formation and the next-generation HIP-3S combined formation based on the new DIRM, and the cumulative geoid height errors are 2.271×10⁻¹ m and 1.923×10⁻³ m at degree 120, respectively. The study results show that the future HIP-3S formation is helpful for producing the next-generation Earth gravity field model with higher accuracy and spatial resolution.