Research On Data Processing&Application Of Airborne Gravity

In the view of airborne gravity data application, the processing procedure is divided into twoparts, i.e., the pre-processing and the post-processing in this thesis. Emphasis is laid on the latterpart. The main works and innovative points are listed in the following sections:1. The mathematic model of airborne gravimetry is derived and the specific process of airbornegravity data pre-processing is clarified.2. The iterative method of inverse Poisson integral is derived with its calculation modelconstructed. The boundary problem was solved effectively by the inverse Poisson integraldownward continuation with ground measured data.3. The basic formulae of least square collocation (LSC) and their practical forms in gravity dataprocessing are studied in detail. Several common local co-variance models of gravity anomalyare shown, of which the characteristics are analyzed. Based on the model used in this thesis, thedetermination method of concerned parameters is specified. Ill-conditioning analysis of LSC ismade based on measured gravity anomaly data.4. The theory of layered point mass model based on degree-by-degree residuals is summarizedsystematically. The basic formula of point mass model is deduced here, of which the influencingfactors are studied to come up with a method based on background field to improve thecontinuation precision.5. Based on measured data, contrastive analysis of the applications of iterative method of inversePoisson integral, LSC and point mass model in the downward continuation of airborne gravitydata are made.6. LSC overall fusion and multi-resolution LSC fusion are raised from the basic principle of LSC.The advantages of multi-resolution LSC fusion are shown. Together with the basic principle ofvirtual point mass model, the application advantages of layered point mass model based ondegree-by-degree residuals in multi-source gravity data fusion are presented.7. Analytic fusion based on few ground control points is put forward from the practicalapplication of gravity data.8. Effective fusion of measured multi-source gravity data is made with the three methodsresearched above, i.e., multi-resolution LSC fusion, layered point mass model based ondegree-by-degree residuals and Analytic fusion based on few ground control points.9. The influence of data fusion error towards the determination of geoid is studied.