Position measurements at GNSS station SMR5 in 2021 with links to RINEX data files@en

SMR5 GNSS long-term raw-data series is aimed at contributing to the scientific research of Earth-System-involved global- as well as Antarctic-regional processes, improving International Terrestrial Reference Frame (ITRF) redefinitions, and benefiting society through enhanced GNSS-derived applications and services. The dataset was gathered at the Argentinean (Antarctic) research station San Martín in the year 2021. Approximate position in ITRF2014 frame at epoch 2021.5: X=927077.22m, Y=-2195043.59m, Z=-5896521.10m or in (GRS80) ellipsoidal coordinates: lat=68°07'46.851''S, lon=067°06'11.602''W, h=26.8m, orthometric height above EGM2008 geoid amounts 17.3m. GNSS receiver: TRIMBLE NetR9 (SN: 5226K50357), GNSS antenna: Zephyr Geodetic 2 w/Dome, PN: 57971-00 (SN: 30976593), Sampling interval: Originally 1 second, downsampled in postprocessing to 15 seconds. Each file covers a time period of one day. RINEX files have been converted from original TRIMBLE proprietary T02 files, applying software tools runpkr00 and teqc. RINEX format version is 2.11. Finally the data have been compressed applying Hatanaka tool (Hatanaka, Y. (2008), A Compression Format and Tools for GNSS Observation Data, Bulletin of the Geospatial Information Authority of Japan, 55, 21-30, available at https://www.gsi.go.jp/ENGLISH/Bulletin55.html) and gzip.

SMR5全球导航卫星系统（GNSS）长期原始数据序列旨在助力涉及地球系统的全球及南极区域过程科学研究，推动国际地面参考框架（International Terrestrial Reference Frame, ITRF）的重新定义工作，并通过优化GNSS衍生应用与服务造福社会。该数据集于2021年在阿根廷（南极）圣马丁科考站采集。其在2021.5历元下的ITRF2014框架近似坐标为：X=927077.22米，Y=-2195043.59米，Z=-5896521.10米；或采用GRS80椭球坐标：南纬68°07'46.851''，西经67°06'11.602''，大地高26.8米，基于EGM2008大地水准面的正高为17.3米。所用GNSS接收机为TRIMBLE NetR9（序列号：5226K50357），GNSS天线为带穹顶罩的Zephyr Geodetic 2，部件编号：57971-00（序列号：30976593）。原始采样间隔为1秒，经事后处理降采样至15秒。单个数据文件覆盖1天的观测时段。RINEX文件由原始TRIMBLE专有T02文件转换得到，转换时使用了runpkr00与teqc软件工具，RINEX格式版本为2.11。最终数据通过Hatanaka工具（引用文献：Hatanaka, Y. (2008), A Compression Format and Tools for GNSS Observation Data, Bulletin of the Geospatial Information Authority of Japan, 55, 21-30, 可访问https://www.gsi.go.jp/ENGLISH/Bulletin55.html）及gzip进行压缩。