联合T/P 数据、T/P新轨道数据、Jason-1数据、Jason-1 新轨道数据、Jason-2数据、Geosat/GM数据、Geosat/ERM数据、Envisat RA-2数据、ERS-1/ERM和ERS-2/ERM数据,基于EGM2008重力场模型,用相邻测高点大地水准面高度的一次差分求沿轨垂线偏差,然后基于最小二乘原理,采用求最小范数逆的方法,直接解算中国近海及其邻域(0°~42°N,102°~138°E) 2'X2'分辨率网格点垂线偏差子午分量和卯酉分量。计算结果与EGM2008模型垂线偏差相比,子午分量的RMS为0.91", 卯酉分量的RMS为0.27"。
Abstract
Based on EGM2008 gravity field model, together with multi-satellite altimetric data,including T/P,new T/P,Jason-l,new Jason-l,Jason-2,Geosat/GM, Geosat/ ERM,Envisat RA-2,ERS-1/ERM and ERS-2/ERM data,the along-track vertical deflections was obtained with the primary difference of two successive geoidal heights. Then according to the least square principle, the meridional component and prime vertical component of the vertical deflections gridded in 2'X2' for China seas and their vicinity(0°~42°N,102°~138°E) were determined. When computing the vertical deflection of the grid point with along track vertical deflections, discrete measurement points in the 4' X 4' region around the grid point were used. The normal equation was easy to be ill-conditioned because the determinant of ATPA is close to zero. In this paper the solution of the observation equation was obtained with the method of computing minimum norm invers. The result was compared with the data of EGM2008 model, the corresponding RMS of the difference is 0. 91” at meridian component and 0. 27”at prime vertical component, and compared with the data of EIGEN_ CG01C model, the corresponding RMS of the difference is 1. 98”at meridian and 2.54" at prime vertical. The vertical deflection data computed in this paper and the data of EGM2008 model were respectively compared with EIGEN_ CG01C model,and the comparison results were roughly the same. It shows that the calculated resulst and EGM2008 model are matched in accuracy. We also analyzed the points with lager error compared with the EGM2008 model, and mapped the distribution of the points with differences greater than 10” at meridian and 5” at prime vertical respectively. It is found that almost all points having lager error were located in the coastal waters or near the islands, this is because the altimeter echo signals were disturbed in the coastal waters and near the islands.
关键词
卫星测高 /
垂线偏差 /
海洋大地测量
Key words
satellite altimeter /
deflection of the vertical /
marine geodetic survey
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1] SANDWELL D T.Antarctic marine gravity filed from high density satellite altimetry[J]. Geophys J Int, 1992, 109:437-448.
[2] OLGIATI A,BALMINO G, SARRAILH M,et al.Gravity anomalies from satellite altimetry: Comparison between computation via geoid heights and via deflections of vertical[J]. Manu-scripta Geodaetica, 1995.69 :252-260.
[3] HWANG C, EU C K, PARSONS B.Global derivation of marine gravity anomalies from Seasat, Geosat, ERS 1 and TOPEX/PO-SEIDON altimeter data[J]. Geophys J Int, 1998, 134:449-459.
[4] WANG Hu biao, WANG Yong,LU Yang. High precision vertical deflection over China marginal sea and global sea derived from multi-satellite altimeter[J]. Geomatics and Information Science of Wuhan University , 2007 ,32(9) :770-773.
王虎彪,王勇,陆洋.联合多种测高数据确定中国边缘海及全球海域的垂线偏差[J].武汉大学学报·信息科学版, 2007,32(9):770-773.
[5] DENG Kai-liang, BAO Jing-yang, Zhang Chuan-yin, et al.Determination of vertical deflection over China Sea by combination of multi satellite altimeter data[J]. Hydrographic Surveying and Charting , 2008, 28(3):15-17.
邓凯亮,暴景阳,章传银,等.联合多代卫星测高数据建立中国近海垂线偏差模型[J].海洋测绘,2008,28(3):15-17.
[6] PENG Fu-qing, XIA Zhe-ren.Vertical deflection theorem of satellite altimetry[J]. Hydrographic Surveying and Charting , 2004,24(2) :5-9.
彭富清,夏哲仁.卫星测高中的垂线偏差法[J].海洋测绘,2004,24(2) :5-9.
[7] HWANG C, HSU Y, JANG J.Global mean sea surface and marine gravity anomaly from multi-satellite altimetry: Applications of deflections of deflection geoid and inverse Vening Meinesz formulae[J]. Journal of Geodesy , 2002 , 76:407-418.
[8] HOF MANN-WELLENHOF B,MORITZ H. Physical geodesy[M]. New York: Springer , 2006.
[9] JIN Tao yong, LI Jian cheng, XING Le-lin, et al. Research on datum unification of multi satellite altimetric data[J]. Journal of Geodesy and Geodynamics, 2008 ,28(3):92-99.
金涛勇,李建成,邢乐林,等.多源卫星测高数据基准的统一研究[J].大地测量与地球动力学,2008 , 28(3):92-99.
[10] AVISO. AVISO user handbook: Merged Topex/ Poseidon products[M]. AVI-NT-02-101-CN. Edition 3, 1996.
[11] YALE M M, SANDWELL DT, SMITH W H F. Comparison of along track resolution of stacked Geosat, ERS-l,and TOPEX satellite altimeters[J]. JGR, 1995,100(B8):15 117-15 127.
基金
国家海洋公益性行业科研专项经费资助项目(201105032 1)
PDF(2460 KB)
