联合重力位模型和地形数据的航空重力向下延拓方法  

Downward continuation of airborne gravimetry data based on the combination of geopotential model and topographic data

作　　者：王云鹏 文娅 张丽萍[1,2] 宋颖 庞振兴 WANG Yunpeng;WEN Ya;ZHANG Liping;SONG Ying;PANG Zhenxing(Xi'an Research Institute of Surveying and Mapping,Xi'an 710054,China;State Key Laboratory of Geo-Information Engineering,Xi'an 710054,China;Unit 31411,Shenyang 110001,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]31411部队,辽宁沈阳110001

出　　处：《测绘科学与工程》2020年第6期37-41,65,共6页Geomatics Science and Engineering

基　　金：国家重点研发计划(2018YFC1503806);国家自然科学基金资助项目(41774018)。

摘　　要：本文基于重力位模型和地形数据,利用差分延拓法实现了山西某实验区航空重力测量数据的向下延拓。实验结果表明:(1)与EGM2008重力位模型截断阶数取180阶的延拓结果相比,截断阶数取2160阶的延拓结果精度更高,这是由于EGM2008重力位模型的中高阶位系数主要来自于地形数据。因此,考虑地形数据的影响可以提高向下延拓结果的精度;(2)引入地形数据后,由于重力位模型截断阶数取2160阶的向下延拓重复计算了地形数据的影响,因此延拓结果精度较低,而重力位模型截断阶数取180阶的向下延拓则更加合理,延拓结果精度更高、计算速度也更快。Based on the existing geopotential model and topographic data,the differential continuation method is used for downward continuation of airborne gravimetric data in an experimental area of Shanxi Province.Experimental results show that the continuation result of airborne gravimetric data based on the geopotential model EGM2008 with the truncation order 2160 has a higher precision compared with the geopotential model with the truncation order 180.As the medium and high order coefficients of the EGM2008 are mainly derived from the topographic data,it is assumed that the precision of downward continuation result may be improved if the topographic data is taken into consideration.After the introduction of topographic data,since the influence of topographic data is repeatedly calculated in the downward continuation of geopotential model with the truncation order 2160,the precision of the continuation result is lower,and the downward continuation of airborne gravimetric data based on the geopotential model with the truncation order 180 is more reasonable with higher precision and faster calculation speed.

关 键 词：航空重力测量 向下延拓 差分延拓法 重力位模型 地形数据 

分 类 号：P223[天文地球—大地测量学与测量工程]