摘要
针对卫星测高资料是海洋大地水准面、垂线偏差、重力异常等重力场参量反演的主要数据源。该文联合使用新近补充的Jason-2大地测量任务与HY-2B卫星测高资料,选取中国海及邻近海域(0°~40°N、100°~140°E)以及3个纬度带的10°×10°海域作为研究区域,根据交叉点处的观测时间、经纬度和大地水准面高计算垂线偏差方向分量,并采用XGM2019重力场模型进行检核分析。结果表明,Jason-2和HY-2B测高资料的垂线偏差解算精度可靠,其中HY-2B总体精度稍占优。由于低轨道倾角导致的地面轨迹分布方向及密度的差异,不同纬度带内Jason-2测高数据解算的垂线偏差东西分量精度随纬度的升高而显著提高。
For that satellite altimeter dataset provided main source for the derivation of marine gravity field parameters such as geoid height,vertical deflection and gravity anomaly.In this study,the newly supplemented Jason-2 geodetic mission data and HY-2 B data were pre-processed and transferred to along-track geoid heights by considering the effects of diverse range corrections and sea surface topography.The China Sea and its adjacent area(0°~40°N,100°~140°E)and three 10°×10°rectangular areas within different latitudinal zone were selected as study areas.The directional components of vertical deflection were calculated based on the measuring time,geographic location and derived geoid heights at the crossover points.Then the results were compared to the XGM2019 model,indicating that the calculated vertical deflections from Jason-2 and HY-2 B dataset were both reliable,and the accuracy of HY-2 B derived vertical deflection was slightly superior to Jason-2.Moreover,the specific distribution directions and spatial density of Jason-2 due to its lower orbital inclination lead to a more obvious improvement of the determined east component of vertical deflection along with increasing latitude.
作者
杨冯莲
张胜军
李航
孔祥雪
王万宁
YANG Fenglian;ZHANG Shengjun;LI Hang;KONG Xiangxue;WANG Wanning(School of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China;Liaoning Earthquake Agency,Shenyang 110031,China)
出处
《测绘科学》
CSCD
北大核心
2020年第7期70-74,99,共6页
Science of Surveying and Mapping
基金
国家自然科学基金项目(41804002)
中央高校基本科研业务专项资金资助项目(N170103009)
武汉大学地球空间环境与大地测量教育部重点实验室开放基金项目(17-01-04)。
