长时序多模多频GNSS-IR潮位反演综合比较分析  

Comprehensive Comparative Analysis of Long-Term,Multi-mode,and Multi-frequency GNSS-IR Tide Inversion

作　　者：余锐[1,2,3] 刘洋 王清泉[1,2,3] 高建伟 张郁[1,2,3] 胡羽丰 YU Rui;LIU Yang;WANG Qingquan;GAO Jianwei;ZHANG Yu;HU Yufeng(Guangzhou Urban Planning&Design Survey Research Institute,Guangzhou 510060,China;Collaborative Innovation Center for Natural Resources Planning and Marine Technology of Guangzhou,Guangzhou 510060,China;Guangdong Enterprise Key Laboratory for Urban Sensing,Monitoring and Early Warning,Guangzhou 510060,China;College of Geological Engineering and Geomatics,Chang'an University,Xi'an 710054,China;Key Laboratory of Western China's Mineral Resources and Geological Engineering,Ministry of Education,Xi'an 710054,China)

机构地区：[1]广州市城市规划勘测设计研究院有限公司,广东广州510060 [2]广州市资源规划和海洋科技协同创新中心,广东广州510060 [3]广东省城市感知与监测预警企业重点实验室,广东广州510060 [4]长安大学地质工程与测绘学院,陕西西安710054 [5]西部矿产资源与地质工程教育部重点实验室,陕西西安710054

出　　处：《武汉大学学报（信息科学版）》2024年第12期2210-2222,共13页Geomatics and Information Science of Wuhan University

基　　金：国家自然科学基金(42041006);陕西省自然科学研究计划(2024JC-YBMS-197);长安大学中央高校基本科研业务费(300102263203);广州市资源规划和海洋科技协同创新中心(2023B04J0301,2023B04J0191);广东省重点领域研发计划(2020B0101130009);广东省城市感知与监测预警企业重点实验室基金(2020B121202019);广州市城市规划勘测设计研究院科技基金(RDI2220201029)。

摘　　要：海平面变化对海岸生态环境和人类生存发展有着重要影响,对海平面进行监测是全球气候变化和海洋灾害监测的重要内容。利用全球导航卫星系统干涉反射测量(global navigation satellite system interferometric reflectometry,GNSS-IR)技术分析了4大卫星导航系统11个频段的数据,反演了中国香港HKQT和美国西雅图SC02测站2018—2022年长时序的潮位结果,并进行了潮汐调和分析和长期变化趋势估计。结果表明,不同频段反演海面高的精度有所差异,经过海面动态误差改正后,精度在10 cm左右,不同接收机和不同环境会导致同一频段有不同的精度表现。海面动态改正能有效降低GNSS-IR潮位反演误差,以无偏均方根误差计算其平均精度提升了20.5%。通过多模多频数据提高了海面高反演的时间分辨率,并在一定程度上提升了数据的精度和连续性。潮汐调和分析结果表明,11个频段的振幅结果能够与验潮站结果很好地吻合,总体差异小于1 cm。但是,部分频段部分潮汐项的相位结果存在较大差异,这与单一频率潮位反演结果的时间分辨率较低有关。长期趋势分析结果表明,香港近海存在约6.0 mm/a的海平面上升,西雅图近海存在约4.0 mm/a的海平面下降,与验潮站结果吻合较好。试验结果不仅评估了多模多频GNSS-IR技术在监测海平面变化上的性能,而且揭示了海平面的长期变化趋势,这对于海洋灾害监测和海洋学研究具有一定的参考意义。Objectives:Sea level changes have significant impacts on coastal ecosystems and human survival and development.Monitoring sea level is an essential part of global climate change and marine disaster sur-veillance.Methods:This study uses global navigation satellite system interferometric reflectometry(GNSS-IR)technology to analyze data from 11 frequency bands across four major satellite navigation systems,inverting for long time series of tidal level results from 2018 to 2022 at HKQT station in Hong Kong,China,and at SC02 station in Seattle,USA,and performs tidal harmonic analysis and estimates long-term change trends.Results:The results indicate that the accuracy of sea level inversion varies among frequency bands.After correcting for dynamic sea level errors,the accuracy is around 10 cm.Different re-ceivers and environments can lead to varying accuracy performances in the same frequency band.Dynamic sea level correction effectively reduces GNSS-IR sea level inversion errors,with an average precision im-provement of 20.5%in terms of unbiased root mean square error.Multi-mode multi-frequency data can en-hance the temporal resolution of sea level inversion,and improve the accuracy and continuity of data.Tidal harmonic analysis shows that the amplitude results across 11 frequency bands align well with the tide gauge results,with overall differences less than 1 cm.However,some frequency bands show significant phase discrepancies in certain tidal components,related to the lower temporal resolution of single-frequency sea level inversion results.Long-term trend analysis indicates a sea level rise of about 6.0 mm/a near Hong Kong,and a sea level decline of about 4.0 mm/a near Seattle which aligns well with tide gauge results.Conclusions:The findings of this paper not only assess the performance of multi-mode multi-frequency GNSS-IR technology in monitoring sea level changes,but also reveal long-term trends in sea level.It can provide valuable references for marine disaster monitoring and oceanographic research.

关 键 词：海平面 长时序 多模多频 GNSS-IR 趋势变化 

分 类 号：P237[天文地球—摄影测量与遥感]