作者: P. N. A. M. Visser , N. Sneeuw , C. Gerlach
DOI: 10.1007/S00190-003-0315-8
关键词: Orbit determination 、 Satellite 、 Sensitivity (control systems) 、 Mathematical analysis 、 Focus (optics) 、 Geodesy 、 Iterative method 、 Gravitational field 、 Spherical harmonics 、 Physics 、 Orbit (dynamics)
摘要: A fast iterative method for gravity field determination from low Earth satellite orbit coordinates has been developed and implemented successfully. The is based on energy conservation avoids problems related to dynamics initial state. In addition, the particular geometry of a repeat exploited by using very efficient estimation scheme, in which set normal equations approximated sparse block-diagonal equivalent. Recovery experiments spherical harmonic models up degree order 80 120 were conducted 29-day simulated data coordinates. was found be flexible could easily adapted include observations non-conservative accelerations, such as (to be) provided satellites like CHAMP, GRACE, GOCE. serious drawback its large sensitivity velocity errors. Existing strategies need altered or augmented algorithms that focus optimizing accuracy estimated velocities.