| 摘要: |
| 大气水汽的准确测量对于天气预报和气候研究至关重要，全球卫星导航系统（GNSS）对流层水汽反演技术是主要手段之一。然而，目前很少有研究针对低成本GNSS设备在海洋上的水汽反演性能进行分析。在本研究中，通过在“润江1号”国家海洋调查船上采用“零基线”方式安装低成本（DT BD100）以及大地测量型（Trimble NetR9）GNSS接收机，在中国近海海域开展了为期28天的海上观测实验，评估了基于船载GNSS精密单点定位（PPP）的天顶对流层延迟（ZTD）以及大气可降水量（PWV）的反演性能。实验结果表明，在ZTD反演方面，以Trimble NetR9结果为参考，DT BD100 ZTD的反演精度为0.54 cm；在PWV反演方面，以ERA5 PWV结果为参考，DT BD100 PWV结果与Trimble NetR9 PWV结果相似，均方根误差（RMSE）值分别为2.19 mm和2.05 mm。该结果验证了低成本GNSS接收机具备准确反演海上水汽的潜力，这将有助于更多的海洋观测平台通过加载低成本GNSS设备，从而实现对海洋区域大气水汽观测的增强。 |
| 关键词: 全球卫星导航系统 天顶对流层延迟 大气可降水量 低成本接收机 船载设备 |
| DOI： |
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| 基金项目:天津市自然科学基金面上项目（22JCYBJC01540）; 川渝联合实施重点研发项目（CSTB2022TIAD-CUX0016）; 天津大学研究生文理拔尖创新奖励计划（B1-2021-009）; 天津市研究生科研创新项目（2022BKY088） |
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| Maritime water vapor retrieval performance analysis using shipborne low-cost GNSS receiver |
| GUO Bofeng,CHEN Xiyuan,DI Mingwei,YANG Xiaotong,YU Xingwang,ZHU Jianhua,LI Weiqiang |
| (School of Marine Science and Technology, Tianjin University, Tianjin 300072, China;School of Marine Science and Technology, Tianjin University, Tianjin 300072, China; National Ocean Technology Center (NOTC), Tianjin 300112, China;Chongqing Institute of Green and Intelligent Technology , Chinese Academy of Sciences, Chongqing 400714, China) |
| Abstract: |
| Accurate measurement of atmospheric water vapor is crucial for weather forecast and climate research, and the global navigation satellite system (GNSS) tropospheric water vapor retrieval technique is one of the main methods. However, few studies have focused on analyzing the performance of water vapor retrieval techniques using low-cost GNSS equipment. By using the “zero baseline” method to install low-cost (DT BD100) and geodetic measurement (Trimble NetR9) GNSS receivers on the “Runjiang 1” national oceanographic survey ship, a 28-day ocean observation experiment is carried out in China's offshore waters. And the retrieval performance of zenith tropospheric delay (ZTD) and precipitable water vapor (PWV) based on shipborne GNSS precision point positioning (PPP) is evaluated by this experiment. The experimental results show that in terms of ZTD retrieval, the retrieval accuracy of DT BD100 ZTD is 0.54 cm by using Trimble NetR9 as a reference. In terms of PWV retrieval, referring to the result of ERA5 PWV, the result of DT BD100 PWV is similar to that of Trimble NetR9, with the root mean square error(RMSE) of 2.19 mm and 2.05 mm respectively. This result confirms that low-cost GNSS receivers have the potential to accurately retrieve water vapor at sea, which can help more ocean observing platforms to improve the observation of atmospheric water vapor in the ocean region by loading low-cost GNSS equipment. |
| Key words: Global navigation satellite system (GNSS) Zenith tropospheric delay (ZTD) Precipitable water vapor (PWV) Low-cost receiver Shipborne equipment |
