精密重复轨迹卫星数据潮汐参数精化提取研究  

Tidal analysis refinedly from the data of satallites with exact repeat orbit

作　　者：万利 暴景阳 WAN Li;BAO Jingyang(School of Geodesy and Geomatics,Wuhan University,Wuhan 430079,China;School of Smart marine science and Technology,Fujian University of Technology,Fuzhou 350118,China)

机构地区：[1]武汉大学测绘学院,湖北武汉430079 [2]福建理工大学智慧海洋科学技术学院,福建福州350118

出　　处：《海洋测绘》2024年第5期18-23,共6页Hydrographic Surveying and Charting

基　　金：国家自然科学基金(42192531)。

摘　　要：为削弱卫星测高海面高数据观测噪声对潮汐信号提取的影响,提出了基于分段拟合的海面高数据预处理方法;同时为改进近岸及强流区潮汐参数获取精度,顾及了这类海域的海面高多变特性,提出了基于平均海面高分段设定的潮汐参数与海面高变化联合平差模型,以探测强流区海面变化过程。结果表明,应用改进的沿迹分析方法和长时序T/P、Jason系列测高卫星数据,经交叉点不符值统计分析,8个主要分潮综合潮高预报中误差在全球海洋降低到2.04 cm,全球3个强流区及其扩散区精度达到3~4 cm。研究结果可为潮汐模型精化提供更高质量的潮汐调和常数数据集,同时探测到强流区及其扩散体的海面高频变化序列,可用于研究强流的时变过程与规律。To mitigate the influence of observational noise in satellite altimetry sea surface height data on tidal signal extraction,a preprocessing method based on segmented fitting for sea surface height data is proposed.Simultaneously,to improve the accuracy of tidal parameter acquisition in nearshore and strong current areas and considering the variable characteristics of sea surface height in such regions,a joint adjustment model for tidal parameters and sea surface height variations based on segmented mean sea surface height setting is proposed to detect the sea surface changes in strong current areas.The results indicate that by applying the improved along-track analysis method and long-term T/P and Jason series altimetry satellite data,through statistical analysis of cross-point discrepancies,the error in the comprehensive tidal height prediction of eight major tidal constituents has been reduced to 2.04 cm globally and achieved an accuracy level of 3~4 cm in three global strong current areas and their diffusion areas.The research findings can provide a higher quality dataset of tidal harmonic constants for refining tidal models.Simultaneously,high-frequency sea surface height variation sequences in strong current areas and their diffusion bodies are detected,which can be used to study the temporal processes and patterns of strong currents.

关 键 词：卫星测高 潮汐分析 低通滤波 平均海平面 精度分析 

分 类 号：P229.7[天文地球—大地测量学与测量工程]