顾及平均效应的GPS海潮负荷位移估算方法  

GPS ocean loading tidal displacement estimation method considering average effect

作　　者：张化疑 冯义楷 许军 周东旭[1,2] 杨龙 ZHANG Huayi;FENG Yikai;XU Jun;ZHOU Dongxu;YANG Long(The First Institute of Oceanography,Ministry of Natural Resources,Qingdao 266061,China;Key Laboratory of Oceanic Surveying and Mapping,Ministry of Natural Resources,Qingdao 266590,China;Shandong University of Science and Technology,College of Geodesy and Geomatics,Qingdao 266590,China)

机构地区：[1]自然资源部第一海洋研究所,山东青岛266061 [2]自然资源部海洋测绘重点实验室,山东青岛266590 [3]山东科技大学测绘学院,山东青岛266590

出　　处：《海洋测绘》2022年第3期22-26,47,共6页Hydrographic Surveying and Charting

摘　　要：利用GPS估算海潮负荷位移时,当GPS采样间隔较大时(大于2 h),容易导致海潮负荷位移参数估算误差比较大,针对上述存在的问题,在原有的海潮负荷位移估算方法基础上设计新算法,将时间间隔平均位移按非线性变化过程重构,求取时间间隔平均位移,减弱因时间间隔平均而产生的误差。经分析实算数据发现,当数据时间间隔较短(≤2 h)时,调和-设计算法对传统算法的影响较小;当采样间隔≥4 h时,设计算法对振幅较大的分潮(M2、O1)垂直方向上改进效果明显。实例结果表明新算法在采样间隔比较大的情况下,能够明显改善估算的海潮负荷位移参数的精度。When estimating the ocean tide loading displacement using GPS,aiming at the problem that the large sampling interval(>2 hours)of GPS is easy to lead to large estimation error,based on the original estimation method of sea tide load displacement,this paper reconstructs the time interval average displacement according to the nonlinear change process to obtain the time interval average displacement,so as to reduce the error caused by time interval average.It is found that the difference between the design algorithm and traditional algorithm is small when the sampling interval is≤2 hours;When the sampling intervals is≥4 hours,design algorithm can improve the accuracy of the parameters with the large amplitude obviously.The example results show that the new algorithm can significantly improve the accuracy of the ocean tide loading displacement parameters with a relatively large sampling interval.

关 键 词：海潮负荷位移 海潮模型 调和分析 调和-设计法 平均效应 时间窗口 

分 类 号：P229[天文地球—大地测量学与测量工程]