卫星测高不同波形重构方法的偏差特性分析  

Analysis of Bias Characteristics in Different Waveform Retracking Methods of Satellite Altimetry

作　　者：彭福凯[1,2] 沈云中[1,2] 赵健[1] 

机构地区：[1]同济大学测绘与地理信息学院,上海200092 [2]同济大学空间信息科学及可持续发展应用中心,上海200092

出　　处：《海洋测绘》2014年第3期1-4,共4页Hydrographic Surveying and Charting

基　　金：国家重点基础研究计划(973计划)(2012CB957703);国家自然科学基金(41274035)

摘　　要：利用我国近海4条轨迹、40个周期EnviSat-1的卫星测高波形数据,采用OCOG、Threshold、5-β参数算法以及Ocean法进行波形重构计算。根据不同轨迹和周期的波形数据,由上述四种方法重构海面高并计算相互之间的偏差及其中误差。结果表明,OCOG、Threshold、5-β参数算法与Ocean方法之间的偏差分别为88.46cm、35.90cm和25.83cm,相应的中误差分别为2.11cm、1.96cm和0.41cm,而且该偏差量对于不同的轨迹和周期是不变的。因此,只要对系统偏差进行改正,就能融合不同波形重构方法求得海面高,充分发挥不同波形重构方法在不同海区的优势,为近岸海域海平面变化,大地水准面的研究提供高精度的资料。This paper processes 40 cycles Envisat-1 waveform data in four passes, using OCOG, Threshold, 5-β parameter and Ocean waveform retracking methods. Based on waveform data in different passes and cycles, we calculated deviations and standard deviations between four waveform retracking SSHs. As the result shows, deviation between OCOG,Threshold,5-β parameter and Ocean is 88.46cm, 35.90cm,25.83cm, corresponding standard deviation is 2. 11 cm, 1.96cm, 0.41cm. Moreover, the deviation is the same between different passes and cycles. Thus ,if only we correct the system bias ,different waveform retracking SSHs can be mixed together. In this way, we can make full use of advantages of different waveform retracking methods in different ocean areas, which can offer high accurate data for the research of sea level change and geoid in costal sea.

关 键 词：卫星测高 波形重构 偏差特性 统计分析 

分 类 号：P228.3[天文地球—大地测量学与测量工程]