摘要
联合多代卫星测高数据,研究并实现了多种测高数据联合交叉点平差方法,削弱了数据内部系统性偏差;采用沿轨迹加权最小二乘方法,选取适当的搜索半径,确定了浙江近海剩余垂线偏差子午分量ξ和卯酉分量η;基于移去-恢复方法和FFT技术,利用剩余垂线偏差,考虑最内圈带的影响,选取适当的积分半径,反演得到了浙江近海高分辨率的重力异常模型和大地水准面模型;将浙江近海重力异常与船测重力进行比较,差值的均方根为±5.231 58mGal;将浙江近海大地水准面与EGM96及EGM2008模型大地水准面进行比较,差值的均方根分别为±0.694 57m及±0.029 51m。
Multi-satellite altimeter data were used to study and the method of combined crossover adjustment was completed.Systematic bias might be reduced with the method.The meridional component and prime vertical component of the residual vertical deflections of Zhejiang offshore were determined using the weighted method of along-track least squares with an appropriate search radius.On the basis of remove-restore method and FFT technology,the gravity anomaly model and geoid model gridded with a spatial resolution of 2.5′of Zhejiang offshore were determined using the residual vertical deflections with an appropriate integration radius,under the consideration of effects of innermost zone.The gravity anomaly computed by the method was compared with the shipborne gravity,the RMS of the difference is±5.231 58 mGal.The marine geoid was compared with the results calculated with EGM96 and EGM2008,the RMS of the difference is±0.694 57 mand ±0.029 51 m.
出处
《大地测量与地球动力学》
CSCD
北大核心
2015年第1期40-44,共5页
Journal of Geodesy and Geodynamics
关键词
卫星测高
垂线偏差
重力异常
海洋大地水准面
FFT
satellite altimetry
deflection of the vertical
gravity anomaly
marine geoid
FFT
