摘要
The GOCE Earth’s gravitational field complete up to degree and order 250 is recovered based on the time-space domain method associated with Kaula regularization in order to study the influences of satellite gravity gradiometry on the accuracy of medium-high frequency Earth’s gravitational field recovery. The results show: 1) the time-space domain method is an effective way to accurately and rapidly determine the high-degree Earth’s gravitational field; 2) the Kaula regularization is one of the key processes to reduce ill condition of normal matrix; 3) the large-scale linear system of equations is solved quickly using the improved pre-conditioned conjugate-gradient iterative approach, and the computing time can be reduced at least 1 000 times as compared to the direct least-squares approach; 4) at the degree 250, cumulative geoid height and gravity anomaly errors are 9.295 cm and 0.204 mGal with orbital error 1 cm and gravity gradient error 3×10-12/s2, respectively; and 5) the complementarity of high-accuracy and high-resolution Earth’s gravitational field recovery between international GRACE and GOCE missions is demonstrated.