Energy Conservation Method Applied In GOCE Satellite Data Solution

Such as CHAMP, GRACE and GOCE Leo satellite launched, satellite gravity detection has become as another important research field in the geodetic, and various another subjects demand of gravitational field more higher, also applied more and more widely, covering almost all the subjects to geophysics, and earth's gravitational field model is the basis of all research, such as the geoids, gravity anomaly, etc, Based on this, the paper lays emphasis on the research of gravity field model for calculating zonal spherical harmonic coefficients, and contrast to the aspects as geode and gravity anomaly. The paper outlines the research contents are as follows:1. Emphatically analyzes the earth gravity field model and the significance of satellite gravity detecting, has summed up the present international on the present research situation about the gravity field already and the announced gravity field model, and analyzes the present situation of the earth's gravity research situation and problems in our country.2. Researched the basic theory of gravity field, strictly deduced calculating formula of the gravity field model and several methods of gravity field model:direct method, the time-wise method and the space-wise method; combining the technology of the satellite gravity, the paper deduced the calculating formula of the earth's gravity model by the method of energy conservation law, simultaneous these two types of formula can made the model error equation, can the computed gravity field model spherical harmonic coefficients; Also analyzed the several methods of calculating error equation, and decide the least-square method for calculating method for this article.3. GOCE satellite data obtained from ESA, focus on the data structure, and pretreatment the orbit data simply, for later use, and analyzed several coordinate system of correlation, made the software on the coordinate transformation (use four element method); deduced the calculation method of inverse gravity field model by gravity gradient data; calculated thel day of geometry orbit data,and processed gross error detection, the XY axis precision (RMS) about was 20mm, the Z axis accuracy relative lower, has more than 35mm individually.4. Calculated all kinds of the influence of perturbation forces(mainly six) on the satellite's orbit GOCE, then correct that when computed; made software computed a group of 36 degree gravity field model called-SWJTG11, and contrasted with reference model, each degree variance errors mainly concentrated in around 10-10, the geoid difference between the reference model come to maximum 10.4 mm.5. Use GMT drawing software, draw the global distribution chart of the geoid and the gravity anomalies, and the char of the difference between them, contrast to the differences focus on by the color and delicate extent with reference model, than analysis the distribution on the each other differences by the geography.