DQM2022系列超高阶地球重力场模型构建及其精度评估  

Construction of series ultra-high-degree Earth s gravity field models DQM2022 and their precision evaluation

作　　者：王云鹏 刘晓刚[1,2] 李琦 李端 方柳 WANG Yunpeng;LIU Xiaogang;LI Qi;LI Duan;FANG Liu(Xi'an Research Institute of Surveying and Mapping,Xi'an 710054,China;State Key Laboratory of Geo-Information Engineering,Xi'an 710054,China;Xi'an Division of Surveying and Mapping,Xi'an 710054,China)

机构地区：[1]西安测绘研究所,陕西西安710054 [2]地理信息工程国家重点实验室,陕西西安710054 [3]西安测绘总站,陕西西安710054

出　　处：《测绘学报》2024年第8期1505-1516,共12页Acta Geodaetica et Cartographica Sinica

基　　金：国家自然科学基金(42174001,41774018);地理信息工程国家重点实验室开放基金(SKLGIE2023-Z-1-1)。

摘　　要：本文基于椭球谐分析,提出了超高阶地球重力场模型构建的局部积分改进迭代法和全球积分改进迭代法,解决了传统的局部积分改进法存在的局限性,有效提高了改进模型在中国地区的适用精度。选择EGM2008、EIGEN-6C4地球重力场模型作为初始模型,利用中国及周边地区最新的5′×5′实测格网平均重力异常数据,构建了DQM2022系列超高阶地球重力场模型,其完全阶次均为2190。采用地面实测重力异常、GNSS/水准、天文大地垂线偏差等数据对改进模型进行精度评估。结果显示:①相对于初始模型,改进模型表示中国地区重力场的精度显著提高,重力异常精度提高了2.4~2.8 mGal,高程异常精度提高了1.0~2.4 cm,垂线偏差精度提高了0.07″~0.15″;②在表示中国地区重力场时,基于EIGEN-6C4初始模型构建的改进模型精度最高,高程异常精度约为10.6 cm,垂线偏差精度约为2.1″。Based on ellipsoidal harmonic analysis,the regional integral correction iteration method and the global integral correction 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 applied in China is effectively improved.Taking EGM2008 and EIGEN-6C4 EGMs as the initial models,and series ultra-high-degree EGMs DQM2022 are constructed based on the latest 5′×5′measured grid mean gravity anomaly data in China and its surrounding areas,and their complete degree and order is 2190.The precision of improved EGMs are evaluated by measured gravity anomaly on the ground,GNSS/leveling and astrogeodetic vertical deflection.The results show that the precision of the improved 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″,respectively.

关 键 词：局部积分改进迭代法 全球积分改进迭代法 超高阶地球重力场模型 椭球谐分析 重力异常 高程异常 垂线偏差 

分 类 号：P223[天文地球—大地测量学与测量工程]