基于Cryosat和Jason1 GM数据的垂线偏差计算与分析  

Calculation and Analysis of the Deflection of Vertical Derived from Cryosat and Jason1 GM Data

作　　者：张胜军[1] 李建成[1] 褚永海[1] 孔祥雪[1] 

机构地区：[1]武汉大学测绘学院,湖北武汉430079

出　　处：《武汉大学学报（信息科学版）》2015年第8期1012-1017,共6页Geomatics and Information Science of Wuhan University

基　　金：国家973计划资助项目(2013CB733301);国家自然科学基金资助项目(41210006;41304003);国家863计划资助项目(2013AA122502);地理空间信息工程国家测绘地理信息局重点实验室资助项目(201323)~~

摘　　要：针对不同时空分辨率测高数据对测高垂线偏差计算结果的影响,联合使用Jason1波形数据和Cryosat数据,在对波形重跟踪处理和海面时变效应消弱预处理后,采用Sandwell方法和加权最小二乘法计算了三个典型区域的垂线偏差分量。研究结果与EGM2008模型检核表明,低轨道倾角的Jason1大地测量任务数据能有效提取垂线偏差东西分量信息,联合高轨道倾角的Cryosat测高数据可以提升垂线偏差计算精度,而引入重力场模型作为参考场可以进一步改进垂线偏差计算结果。Satellite altimetry data with different spatial and temporal resolution has different effects on calculation of the deflection of vertical, thus the Jason1 waveform data and Cryosat data are combined. After the preprocessing of waveform retracking and the time-varying effect weakened, the deflection of vertical components at three different typical areas are obtained based on the Sandwell method and the weighted least squares method, respectively. The results were compared with the EGM2008 mod- el value showing that the Jasonl data of geodetic mission with a lower orbital inclination can improve the accuracy of the east-west component of vertical deflectionand combination of Cryosat data with higher orbital inclination can obtain a better result. In addition, the remove-restore method with a gravity field model as a reference field, can bring a further improvement in the computing accuracy.

关 键 词：卫星测高 轨道倾角 波形重跟踪 海面地形 垂线偏差 

分 类 号：P228[天文地球—大地测量学与测量工程]