合成孔径雷达高度计波形重跟踪算法的近岸精度分析  

Analysis on the Accuracy of Waveform Retracking for the Coastal Synthetic Aperture Radar Altimeter Data

作　　者：高贤文 金涛勇[1,2] 黄海兰[1,2] GAO Xianwen;JIN Taoyong;HUANG Hailan(School of Geodesy and Geomatics,Wuhan University,129 Luoyu Road,Wuhan 430079,China;Key Laboratory of Geospace Environment and Geodesy,Ministry of Education,Wuhan University,129 Luoyu Road,Wuhan 430079,China)

机构地区：[1]武汉大学测绘学院,武汉市珞喻路129号,430079 [2]武汉大学地球空间环境与大地测量教育部重点实验室,武汉市珞喻路129号,430079

出　　处：《大地测量与地球动力学》2021年第1期56-61,共6页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金(41721003,41974020);高分辨率对地观测系统重大专项(42-Y20A09-9001-17/18)。

摘　　要：针对近岸区域,基于Sentinel-3A合成孔径雷达观测数据,选取多阈值、ICE1、IceSheet和SAMOSA四种波形重跟踪算法,利用全球范围内27个验潮站海面高数据,分析近岸20 km范围内4种波形重跟踪算法的精度。结果表明,多阈值算法在近岸6 km范围内可保留最多的有效波形,且与验潮站海面高数据具有最高的相关性和最小的均方根误差;SAMOSA算法在离岸距离大于5 km时相对大地水准面稳定性最高,更适用于开阔海域。We select four waveform retrackers including SAR multi-threshold,ICE1,IceSheet and SAMOSA,to retrack the Sentinel-3A SAR waveforms in the coastal areas.We then analyze the accuracy of the four retrackers within 20 km offshore by comparison with observations from 27 tide gauges.The results show that the SAR multi-threshold retracker can retain the most valid data,and obtain the highest correlation as well as the smallest root mean square error of difference between the derived sea surface heights and the tide gauge sea levels within 6 km offshore.The SAMOSA retracker has the highest stability related to the geoid beyond 5 km from the shore,which can provide high-precision sea surface height in open ocean.

关 键 词：卫星测高 合成孔径雷达高度计 验潮站 海面高 波形重跟踪 

分 类 号：P228[天文地球—大地测量学与测量工程] P229[天文地球—测绘科学与技术]