| Zhai Wanlin,Zhu Jianhua,Ma Chaofei,Fan Xiaohui,Yan Longhao,Wang He,Chen Chuntao. 2020. Measurement of the sea surface using a GPS towing-body in Wanshan area. Acta Oceanologica Sinica, 42(5):123－132 |
| Measurement of the sea surface using a GPS towing-body in Wanshan area |
| 利用GPS拖体在万山区域测量平均海面技术研究 |
| Received:June 13, 2019 |
| DOI：10.1007/s13131-020-1599-8 |
| Key words:GPS towing-body sea surface height GPS buoy GPS reference station tide gauge sea surface |
| 中文关键词: GPS拖体 海面高度 GPS浮标 GPS基准站 验潮仪 |
| 基金项目: |
| Author Name | Affiliation | E-mail | | Zhai Wanlin | National Ocean Technology Center, Tianjin 300112, China | zwl13032@163.com | | Zhu Jianhua | National Ocean Technology Center, Tianjin 300112, China | | | Ma Chaofei | National Satellite Ocean Application Service, Beijing 100081, China | | | Fan Xiaohui | Tianjin Guohai Marine Engineering Survey Co. Ltd, Tianjin 300350, China | | | Yan Longhao | National Ocean Technology Center, Tianjin 300112, China | | | Wang He | National Ocean Technology Center, Tianjin 300112, China | | | Chen Chuntao | National Ocean Technology Center, Tianjin 300112, China | |
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| Abstract: |
| Wanshan area has been chosen to be the specified field to calibrate and validate (Cal/Val) the HY-2 altimeter and its follow-on satellites. In March 2018, an experiment has been conducted to determine the sea surface height (SSH) under the HY-2A ground track (Pass No. 203). A GPS towing-body (GPS-TB) was designed to measure the SSH covering an area of about 6 km×28 km wide centered on the HY-2A altimeter satellite ground track. Three GPS reference stations, one tide gauge and a GPS buoy were placed in the research area, in order to process and resolve the kinematic solution and check the precision of the GPS-TB respectively. All the GPS data were calculated by the GAMIT/GLOBK software and TRACK module. The sea surface was determined by the GPS-TB solution and the tide gauge placed on Zhiwan Island. Then the sea surface of this area was interpolated by ArcGIS 10.2 with ordinary Kriging method. The results showed that the precision of the GPS-TB is about 1.10 cm compared with the tide gauge placed nearby, which has an equivalent precision with the GPS buoy. The interpolated sea surface has a bias of -1.5-4.0 cm with standard deviation of 0.2-2.4 cm compared with the checking line. The gradient of the measured sea surface is about 1.62 cm/km along the HY-2 orbit which shows a good agreement compared with the CLS11 mean sea surface (MSS). In the Cal/Val of satellites, the sea surface between the tide gauge/GPS buoy and the footprint of altimeter can be improved by this work. |
| 中文摘要: |
| 万山海域被选为HY-2卫星及其后续卫星高度计定标检验的区域。2018年3月，在HY-2卫星轨道（Pass 203）周边进行了海面高度测量试验。研究人员首先设计了GPS拖体对海面高度进行测量，测量范围以HY-2轨道为中心，覆盖周边6 km*28 km的区域。同时，在研究区内设置了GPS基准站对GPS拖体进行动态解算，并使用GPS浮标和验潮仪对拖体的测量精度进行检测。所有GPS数据均通过GAMIT/GLOBK软件和TRACK模块计算。海面高度由GPS拖体动态解算结果和位于直湾岛的验潮仪来确定，然后用Arcgis10.2中的普通克里金插值方法对该地区的海面进行插值。结果表明，GPS拖体海面高度测量的精度与验潮仪的测量值对比后标准偏差约为1.10cm，与GPS浮标的精度相当。与检查线相比，内插后的海面高度偏差为-1.5~4.0cm，标准偏差为0.2~2.4cm。沿HY-2卫星轨道测得的海面高度坡度约为1.62cm/km，与CLS11平均海平面（MSS）具有较好的一致性。在卫星的校准与评估中，海面高度可以改善验潮仪/GPS浮标与高度计足迹之间的测量偏差。 |
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