X-band Radar surface derived currents M203

Radar derived surface currents, based in linear waves dispersion relation properties. The retrieved currents are based on the frequency shifts observed by the radar within the wave field observations.A Helmholtz-Zentrum Hereon marine X-band radar was installed in RV Meteorfrom August 10th 2024 to March 17th 2025. An external GPS was also installed to geolocate the radar backscatter-Intensity data. The radar was equipped with a 7.5' (2.3 m) wide antenna with vertical polarization in transmit and receive (VV) and operated in short pulse mode with a pulse duration of 50 to 70 ns, a pulse repetition frequency of 2000 Hz, and a nominal transmitted peak power of 12 kW. These settings yield a nominal resolution at the -3 dB level of 7.5 to 10.5 m and about 1° in range and azimuth, respectively. The recieved signal was digitized at 40 MHz with 1504 sampled range cells yielding a spatial sampling distance of 3.75 m, and a maximum range of roughly 5640 km. The radar was scheduled to continuously record data in the standard scanning mode, that is at an antenna rotation period of roughly 2 seconds. The radar was operated as needed, based on the Meteor crew's requirements. During the first two weeks, some data was lost due to hard drive storage failures. That issue was resolved, and the remaining data gaps are due to intentional shutdowns requested by the crew.

本数据集为基于线性波色散关系特性的雷达反演表层海流：所反演得到的海流数据，依托雷达在海浪场观测中捕获的频率偏移量计算生成。亥姆霍兹-赫伦研究中心（Helmholtz-Zentrum Hereon）的船载X波段海洋雷达，于2024年8月10日至2025年3月17日搭载于‘流星号’（RV Meteor）科考船。本次任务同步部署外部GPS设备，用于对雷达后向散射强度数据进行地理定位。该雷达配备口径7.5英尺（约2.3米）的天线，采用收发垂直极化（VV）模式，工作于短脉冲模式：脉冲持续时长50至70纳秒，脉冲重复频率2000赫兹，额定发射峰值功率12千瓦。上述配置下，系统在-3dB半功率点的标称分辨率为：距离向7.5至10.5米，方位向约1°。接收信号以40MHz采样率进行数字化，共包含1504个距离向采样单元，空间采样间隔为3.75米，最大探测距离约5640千米。该雷达默认以标准扫描模式连续记录数据，天线旋转周期约为2秒，实际运行将根据‘流星号’科考团队的需求按需调整。任务最初两周，因硬盘存储故障出现部分数据丢失，该问题已完成修复；剩余的数据空白均为科考团队主动关停设备所致。