A Kalman Filter Approach to Realize the Lowest Astronomical Tide Surface     

D. C. Slobbe  J. Sumihar  T. Frederikse  M. Verlaan  R. Klees  F. Zijl 《Marine Geodesy》2018,41(1):44-67

In this paper , we present a novel Kalman filter approach to combine a hydrodynamic model-derived lowest astronomical tide (LAT) surface with tide gauge record-derived LAT values. In the approach, tidal water levels are assimilated into the model. As such, the combination is guided by the model physics. When validating the obtained “Kalman-filtered LAT realization” at all tide gauges, we obtained an overall root-mean-square (RMS) difference of 15.1 cm. At the tide gauges not used in the data assimilation, the RMS is 17.9 cm. We found that the assimilation reduces the overall RMS difference by ～ 31% and ～ 22%, respectively. In the Dutch North Sea and Wadden Sea, the RMS differences are 6.6 and 14.8 cm (all tide gauges), respectively. Furthermore, we address the problem of LAT realization in intertidal waters where LAT is not defined. We propose to replace LAT by pseudo-LAT, which we suggest to realize similarly as LAT except that all water level boundary conditions and assimilated tidal water levels have to be enlarged by a constant value that is removed afterward. Using this approach, we obtained a smooth reference surface for the Dutch Wadden Sea that fits LAT at the North Sea boundary within a few centimeters.  相似文献   

西江河道测量若干技术问题的研究          下载免费PDF全文

周庆冲 《海洋测绘》2008,28(5):59-61

西江的测量环境非常复杂,下游属于感潮河段,而上游却不受潮汐影响,水位的高低主要与河床的倾斜情况相关。根据西江河道测量的实施情况,分析出海河道测量过程中所出现的有关技术问题,并提出问题的解决办法。  相似文献   

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陈俊勇 《大地测量与地球动力学》2008,28(4):1-6

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陆珏  陈义  郑波 《大地测量与地球动力学》2008,28(5):77-81

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欧同庚  王琪  傅辉清  路杰  陈志高  杨博雄 《大地测量与地球动力学》2008,28(5):129-132

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海洋地球物理导航   总被引：5，自引：3，他引：2       下载免费PDF全文

彭富清  霍立业 《地球物理学进展》2007,22(3):751-759

本文分析了海洋地球物理导航在水下航行器应用研发中的重要价值,总结了地球物理导航的理论方法,指出了海洋地球物理导航中有待解决的关键技术问题及其发展方向,阐明了海洋地球物理导航与惯导系统的组合是实现实时、连续、精确、安全隐蔽、完全自主水下导航的理想途径.  相似文献   

加权整体最小二乘的验后估计在三维坐标转换中的应用     

王祝安  陈义  毛鹏宇 《大地测量与地球动力学》2018,38(2):216-220

在求解三维小角度坐标转换EIV模型的过程中,顾及到两套坐标系下点坐标初始单位权方差可能不同导致定权不准确的问题,应用Helmert方差分量估计方法,对加权整体最小二乘的随机模型进行验后估计,从而重新分配观测向量和系数矩阵的权,使得解算模型更加合理。算例证明,利用该方法求解坐标转换参数的精确度有所提高,参数估值更接近真值。  相似文献   

基于全球潮汐模型的东海海域潮汐性质空间分布     

邬红涛 《海岸工程》2021,40(4):269-276

利用全球潮汐模型FES 2014(Finite Element Solution 2014)空间分辨率为(1/16)°×(1/16)°的网格点处13个分潮调和常数,借助基于最小二乘法调和分析方法和潮汐特征值的定义算法,定量分析东海海域(117°～131°E,23°～33°N)的潮汐类型、深度基准值和不同潮差类型.结果表...  相似文献   

Height datum unification between Shenzhen and Hong Kong using the solution of the linearized fixed-gravimetric boundary value problem   总被引：4，自引：0，他引：4  

Liming Zhang  Fei Li  Wu Chen  Chuanyin Zhang 《Journal of Geodesy》2009,83(5):411-417

The paper proposes a new algorithm to unify height datums in different regions, which is based on the solution of the linearized fixed-gravimetric boundary value problem. Compared with traditional methods, this method uses GPS ellipsoidal height and gravity disturbances on the surface of the earth to obtain a quasigeoid, which is not related to any local vertical datums. As an example, we calculate the height datum difference between Shenzhen and Hong Kong by applying this new method. The result shows that the height difference obtained by this new method is consistent with the ground leveling result to a few centimeters.  相似文献   

Fitting gravimetric geoid models to vertical deflections   总被引：2，自引：2，他引：0  

W. E. Featherstone  D. D. Lichti 《Journal of Geodesy》2009,83(6):583-589

Regional gravimetric geoid and quasigeoid models are now commonly fitted to GPS-levelling data, which simultaneously absorbs levelling, GPS and quasi/geoid errors due to their inseparability. We propose that independent vertical deflections are used instead, which are not affected by this inseparability problem. The formulation is set out for geoid slopes and changes in slopes. Application to 1,080 astrogeodetic deflections over Australia for the AUSGeoid98 model shows that it is feasible, but the poor quality of the historical astrogeodetic deflections led to some unrealistic values.  相似文献