Based on ellipsoidal harmonic analysis,the regional integral correction iteration method and the global integral cor-rection iteration method for construction of ultra-high-degree Earth's gravity field model(EGM)are proposed in this paper.The limitations of the traditional regional integral correction method are solved,and the precision of the improved EGMs ap-plied in China is effectively improved.Taking EGM2008 and EIGEN-6C4 EGMs as the initial models,and series ultra-high-de-gree EGMs DQM2022 are constructed based on the latest 5'×5'measured grid mean gravity anomaly data in China and its sur-rounding areas,and their complete degree and order is 2190.The precision of improved EGMs are evaluated by measured grav-ity anomaly on the ground,GNSS/leveling and astrogeodetic vertical deflection.The results show that the precision of the im-proved EGMs are significantly improved when indicating the gravity field in China,compared with the initial models,i.e.,the precision of gravity anomaly,elevation anomaly,and vertical deflection are improved by 2.4～2.8 mGal,1.0～2.4 cm,and 0.07"～0.15",respectively.When indicating the gravity field in China,the improved EGMs based on the EIGEN-6C4 initial model have the highest precision,the precision of elevation anomaly and vertical deflection are about 10.6 cm,and 2.1",re-spectively.
维普
万方数据