Real‐Time Sensing of Precipitable Water Vapor From BeiDou Observations: Hong Kong and CMONOC Networks
Real‐Time Sensing of Precipitable Water Vapor From BeiDou Observations: Hong Kong and CMONOC Networks
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DOI：
10.1029/2018jd028320
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发表时间：
2018-08
期刊：
影响因子：
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通讯作者：
Xingxing Li;Han Tan;Xin Li;G. Dick;J. Wickert;H. Schuh
中科院分区：
文献类型：
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作者：
Xingxing Li;Han Tan;Xin Li;G. Dick;J. Wickert;H. Schuh
北斗卫星导航系统（BDS）的发展为实时反演可降水汽（PWV）提供了机会，这有望为时间关键的气象应用做出重大贡献。本研究利用香港连续运行参考站17个站和中国地壳运动观测网（CMONOC）15个站的观测数据，基于实时精密单点定位模糊度消解方法反演PWV。使用后处理的全球定位系统产品对从 BDS 夏季（183-192 年的某一天）和冬季（024-033 年的某一天）观测中检索到的实时 PWV 产品进行分析和验证。结果表明，北斗实时PWV系列与全球定位系统PWV系列吻合较好。香港连续运行参考站和 CMONOC 站的均方根值分别为 2.0-3.5 和 2.5-4.0 毫米。此外，采用固定解代替浮动解可以实现初始化时间短、可靠性强、分布良好等优点。随着北斗星座的逐步建成，北斗系统可以独立实现PWV的实时感知，并有可能为时间紧迫的气象应用做出贡献。
The development of BeiDou Navigation Satellite System (BDS) provides opportunities for real‐time retrieval of precipitable water vapor (PWV), which is expected to significantly contribute to time‐critical meteorological applications. In this study, observations from 17 stations of the Hong Kong Continuously Operating Reference Stations and 15 stations of the Crustal Movement Observation Network of China (CMONOC) are used to retrieve PWV based on the real‐time precise point positioning ambiguity resolution approach. Real‐time PWV products, retrieved from BDS observations of both summer (day of year 183–192) and winter (day of year 024–033) periods, are analyzed and validated using postprocessed Global Positioning System products. The results show that the real‐time BDS PWV series agree well with the Global Positioning System PWV series. Root‐mean‐square values for the Hong Kong Continuously Operating Reference Stations and CMONOC stations are 2.0–3.5 and 2.5–4.0 mm, respectively. In addition, short initialization time, strong reliability, and good distribution could be achieved by applying the fixed solution instead of the float solution. With the gradual completion of BDS constellation, the BDS can independently contribute to real‐time sensing of PWV and potentially contribute to time‐critical meteorological applications.