A low-cost GNSS buoy platform for measuring coastal sea levels
A low-cost GNSS buoy platform for measuring coastal sea levels
复制标题
DOI：
10.1016/j.oceaneng.2020.107198
复制
发表时间：
2020-05
影响因子：
5
通讯作者：
P. Knight;C. Bird;A. Sinclair;A. Plater
中科院分区：
文献类型：
--
作者：
P. Knight;C. Bird;A. Sinclair;A. Plater
开发了一个低成本的全球导航卫星系统（GNSS）浮标平台，用于测量沿海海平面，以便在后勤、物理和/或财政限制无法应用现有潮汐计和卫星测高的情况下提供信息，以及在需要空间和时间离散的潮汐数据以支持监测沿海形态动力学的调查的情况下提供信息。该浮标由支架油管和四个浮子组成，中心平台用于GNSS接收器和天线。总成本约为300英镑（浮标部件100英镑，GPS/记录仪200英镑）。设置单频GNSS接收机，以5Hz频率记录GPS/GLONASS卫星数据。利用RTKLIB软件进行后处理，得到海平面解。使用Van de cassteele测试对参考潮汐计进行GNSS浮标性能评估。通过GNSS浮标与参考测潮仪的差值计算得出的RMSE为1.4 cm，表明该低成本的GNSS浮标测潮仪与以往昂贵的GNSS浮标相比具有较好的性价比，适合获取局地尺度的沿海海平面数据。除了提供厘米精度的海岸数据外，结果还表明，由于海岸几何形状和波浪引起的扰动，海平面数据中存在高频振荡。
A low-cost Global Navigation Satellite System (GNSS) buoy platform was developed for measuring coastal sea levels to provide information where logistical, physical and/or financial constraints prevent the application of established tide gauges and satellite altimetry, and where spatially and temporally discrete tidal data are required to support surveys for monitoring coastal morphodynamics. The buoy was constructed from scaffold tubing and four floats, with a central platform for the GNSS receiver and antenna. The overall cost was around £300 (buoy parts £100, GPS/logger £200). The single frequency GNSS receiver was set up to record GPS/GLONASS satellite data at 5Hz. Post-processing was carried out with RTKLIB software to derive solutions for sea level. GNSS buoy performance was evaluated against a reference tide gauge using a Van de Casteele test. The RMSE of 1.4 cm, computed from the differences between the GNSS-buoy and reference tide gauge, demonstrates that this low-cost GNSS buoy tide gauge compares well with previous, more expensive GNSS buoys and is suitable for obtaining local-scale coastal sea level data. In addition to providing coastal data at cm accuracy, the results also indicate the presence of high frequency oscillations in the sea level data caused by coastal geometry and wave-induced disturbance.