Sensor Data Records (SDR) from the GEOSAT Exact Repeat Mission from 8 November 1986 to 31 December 1989 (NODC Accession 0054289)

This accession contains the sensor data records (SDRs) from the Geodetic Satellite (GEOSAT) Exact Repeat Mission (ERM) for the time period of November 8, 1986 to December 31, 1989. Parameters include: time, orbit, latitude/longitude, and sea surface height. Corrections to the data include: sea level, wind and wave data, tides, dry and wet troposphere, ionosphere, height bias, altimeter crossover differences, altimeter sea surface measurement, and spacecraft orientation. Data were originally submitted to the NODC by the U.S. Navy via the NOAA National Oceanic Service on 9-track tapes. These current data were recovered from the original 9-track tapes archived at the NODC by Data Recovery International, Inc., Hurst, TX. Reports on non-observation periods and any missing data are listed in the 'about' subfolder for this accession. Data is in ASCII format and is archived with associated documentation in the 'data' folder. The US Navy Geosat radar altimeter mission lasted for nearly 5 years (March 1985 to January 1990) and collected approximately 750 million measurements of sea level, wave height, and wind speed over the global oceans. During the Geodetic Mission (March 1985 to September 1986), the satellite did not repeat its ground track for the duration of the mission. The orbit of the satellite was changed in late 1986 to begin the Exact Repeat Mission (ERM) which lasted from October, 1986 until the satellite quit functioning in January 1990. During the ERM, the satellite repeated its ground track every 17 days. Data were initially processed by the Johns Hopkins University Applied Physics Laboratory in Laurel, MD in coordination with the NOAA/NOS Satellite Altimeter Group. Data products were transferred to the NOAA National Oceanographic Data Center (NODC) for distribution. Additional GOEOSAT data is held at the NODC under separate accession numbers.本存档数据集包含大地测量卫星（Geodetic Satellite, GEOSAT）精确重复任务（Exact Repeat Mission, ERM）在1986年11月8日至1989年12月31日期间的传感器数据记录（Sensor Data Records, SDRs）。相关参数包括：时间、轨道、经纬度及海面高度。数据校正项涵盖：海平面数据、风浪数据、潮汐、干/湿对流层、电离层、高度偏差、高度计交叉轨迹差、高度计海面测量数据以及航天器姿态。原始数据由美国海军通过美国国家海洋和大气管理局（National Oceanic and Atmospheric Administration, NOAA）国家海洋服务局（National Ocean Service, NOS）以9轨磁带形式提交至国家海洋资料中心（National Oceanographic Data Center, NODC）。当前这批数据由德克萨斯州赫斯特市的国际数据恢复公司（Data Recovery International, Inc.）从NODC存档的原始9轨磁带中恢复得到。本存档数据集的"about"子文件夹中列出了无观测时段及缺失数据的相关报告。数据采用ASCII格式存储，与配套文档一同归档于"data"文件夹中。 美国海军Geosat雷达高度计任务持续近5年（1985年3月至1990年1月），在全球海洋范围内采集了约7.5亿次海平面、浪高及风速测量数据。在大地测量任务阶段（1985年3月至1986年9月），卫星的地面轨迹在任务全程中未重复。1986年末卫星轨道完成调整，正式启动精确重复任务（ERM），该任务自1986年10月起实施，直至卫星于1990年1月停止运行。在ERM阶段，卫星每17天重复一次地面轨迹。数据最初由马里兰州劳雷尔市的约翰·霍普金斯大学应用物理实验室与NOAA/NOS卫星高度计小组协作处理。数据产品被移交至NOAA国家海洋资料中心（NODC）进行分发。NODC还以单独的存档编号保存了其他Geosat相关数据。