UWBRAD 500-2000 MHz brightness temperature measurements during the ISSIUMAX campaign in Terra Nova Bay, Antarctica

The dataset contains 500-2000 MHz brightness temperature measurements gathered by the Ultra-Wideband Software Defined Microwave Radiometer (UWBRAD) during the Ice Sheet and Sea Ice Airborne Microwave eXperiment (ISSIUMAX) in Terra Nova Bay, Antarctica. UWBRAD was operated from a DHC-6 Twin Otter during the XXXVIII Italian Antarctic Expedition. The campaign collected the first ultrawideband brightness temperature measurements in Antarctica over different targets including sea ice, ice sheets, glaciers, ice shelves, and land. The dataset was collected on 24-25 November 2018 in the coastal region surrounding Mario Zucchelli Station (-74.694807°, 164.113268°). The UWBRAD microwave radiometer measures nadiral circularly polarized brightness temperatures over the entire 500–2000 MHz range using multiple frequency channels. Since this frequency range is not a protected portion of the spectrum, the measurements can be affected by anthropogenic RFI. To address this issue, UWBRAD includes RFI detection and filtering methods to filter out artificial signals received by the radiometer. A full description of the instrument can be found in Andrews et al, 2022 (DOI: 10.1109/TGRS.2021.3090945). The published dataset is in ascii format and consists of geolocated nadiral brightness temperature measurements collected over 12 sub-bands whose central frequencies are 560, 660, 820, 900, 1180, 1240, 1370, 1500, 1630, 1740, 1860, and 1950 MHz. Only measurements with a viewing angle within 5 deg with respect to nadir are reported.本数据集包含超宽带软件定义微波辐射计（Ultra-Wideband Software Defined Microwave Radiometer, UWBRAD）在南极特拉诺瓦湾开展的冰盖与海冰机载微波实验（Ice Sheet and Sea Ice Airborne Microwave eXperiment, ISSIUMAX）期间采集的500–2000 MHz亮度温度（brightness temperature）测量数据。UWBRAD搭载于DHC-6双水獭（DHC-6 Twin Otter）航空器，参与第38次意大利南极科考任务。本次科考获取了南极地区首个针对海冰、冰盖、冰川、冰架及陆地等多种地表目标的超宽带亮度温度测量数据。本数据集采集于2018年11月24日至25日，采集区域位于马里奥·祖凯利站（Mario Zucchelli Station）周边沿海区域，坐标为(-74.694807°, 164.113268°)。UWBRAD微波辐射计采用多频率通道，可覆盖500–2000 MHz全频段，测量天底向圆极化亮度温度。由于该频段不属于频谱保护范围，测量数据可能受到人为无线电频率干扰（Radio Frequency Interference, RFI）的影响。为解决该问题，UWBRAD内置了RFI检测与滤波方法，可剔除辐射计接收到的人工干扰信号。该仪器的详细说明可参见Andrews等人2022年发表的研究（DOI: 10.1109/TGRS.2021.3090945）。公开数据集采用ASCII格式，包含12个子频段的地理定位天底亮度温度测量数据，各子频段中心频率分别为560、660、820、900、1180、1240、1370、1500、1630、1740、1860及1950 MHz。本数据集仅收录与天底方向夹角在5度以内的测量数据。