同步激光测高数据的垂线偏差解算与分析  

Calculation and analysis of vertical deflection of simultaneous laser altimetry data

作　　者：车德福[1] 李航 张胜军[1] 马保东[1] CHE Defu;LI Hang;ZHANG Shengjun;MA Baodong(College of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学资源与土木工程学院,沈阳110819

出　　处：《测绘科学》2021年第11期24-31,共8页Science of Surveying and Mapping

基　　金：国家自然科学基金项目(41871310,41804002);中央高校基本科研业务费项目(N2124005)。

摘　　要：针对传统的垂线偏差计算过程中东西分量与南北分量差异过大的问题,提出了利用新型ICESat-2海面高数据获取高精度东西分量的方法,选定南中国海域(0°~23°N、103°~120°E)作为试验区域,基于ICESat-2 ATL12海表面高度数据产品进行垂线偏差解算。与此同时,采用XGM2019e;159模型检核,对比同时间序列长度的Jason-2解算结果,分析了ICESat-2多波束同步观测模式的垂线偏差解算优势。数值试验表明:ICESat-2获取的海面高观测值精度优于传统雷达测高模式,计算的沿轨垂线偏差精度与Ku波段测高模式相当。ICESat-2中间束强波束的垂线偏差解算精度优于两侧强波束,并且多波束组模式首次提供了跨轨方向的同步观测数据,解算的跨轨垂线偏差精度可靠,可以提升垂线偏差东西向分量的确定精度。In response to the problem that the difference between the prime component and the meridional component is remarkable in the traditional calculation of the vertical deflection,a method is proposed to obtain the high-precision prime component using the new ICESat-2 sea surface height data.In this study,based on ICESat-2 ATL12 sea surface height products over the South China Sea and its adjacent areas(0°~23°N、103°~120°E),and verifying the accuracy of vertical deflection with respect to the XGM2019 e;159 model.At the same time,according to the characteristics of ICESat-2 synchronization and multiple beams,to evaluate the accuracy of vertical deflections with jason-2 data with the same time series length.The results show that ICESat-2 is superior to the traditional radar altimetry model in accuracy of sea surface height observation,and the accuracy of along-track vertical deflection calculated is equivalent to that of Ku-band altimetry pattern.We get the accuracy of the vertical deflection of the ICESat-2 middle strong beam is better than that of the strong beams on both sides.Meanwhile,the multi-beam group pattern provides for the first time the simultaneous observation data in the across-track direction,and it can be used to improve the accuracy of the prime component of the vertical deflection.

关 键 词：ICESat-2 ATLAS 波束组 海面高 垂线偏差 

分 类 号：P228[天文地球—大地测量学与测量工程]