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GRACE UTCSR L-2 Proc Standards Doc - RL 0006 CSR-GR-12-xx
GRACE 327-742 (v 5.0 draft) Apr 18, 2018 Page 3 of 17
TABLE OF CONTENTS
GRAVITY RECOVERY AND CLIMATE EXPERIMENT .................................................................... 1
DOCUMENT CHANGE RECORD ............................................................................................................ 2
I INTRODUCTION............................................................................................................................... 4
I. 1 PURPOSE OF THE DOCUMENT ................................................................................................................ 4
I. 2 DOCUMENT CHANGE HISTORY ............................................................................................................. 4
I. 3 OVERVIEW OF DATA PROCESSING ........................................................................................................ 5
II ORBIT DYNAMICS MODELS ........................................................................................................ 7
II. 1 EQUATIONS OF MOTION ...................................................................................................................... 7
II.1.1 Time Systems ......................................................................................................................... 7
II.1.2 Reference Frames ................................................................................................................... 7
II. 2 GRAVITATIONAL ACCELERATIONS ...................................................................................................... 8
II.2.1 Mean Geopotential & Secular Changes .................................................................................. 8
II.2.2 Solid Earth Tides .................................................................................................................... 9
II.2.3 Ocean Tides ............................................................................................................................ 9
II.2.4 Atmosphere & Oceanic Variability .......................................................................................10
II.2.5 Solid Earth Pole Tide (Rotational Deformation) ...................................................................10
II.2.6 Ocean Pole Tide .....................................................................................................................11
II.2.7 N-Body Perturbations ............................................................................................................11
II.2.8 General Relativistic Perturbations .........................................................................................11
II. 3 NON-GRAVITATIONAL ACCELERATIONS ............................................................................................11
II. 4 EMPIRICAL ACCELERATIONS ..............................................................................................................12
II. 5 NUMERICAL INTEGRATION .................................................................................................................12
III EARTH & SATELLITE KINEMATICS ........................................................................................13
III. 1 EARTH ORIENTATION ........................................................................................................................13
III.1.1 Precession & Nutation ......................................................................................................13
III.1.2 Sidereal Rotation ...............................................................................................................13
III.1.3 Polar Motion .....................................................................................................................14
III. 2 STATION COORDINATES ....................................................................................................................14
III. 3 SATELLITE KINEMATICS ...................................................................................................................15
III.3.1 Rotation of Velocity Components .....................................................................................15
III.3.2 GRACE GPS Antenna Offset Model ................................................................................15
REFERENCES ............................................................................................................................................16