Geodetic data records (GDRs) from the GEOSAT Exact Repeat Mission (ERM) from 01 April 1988 to 04 May 1988 (NODC Accession 8800157)

This accession contains one month of geodetic data records (GDRs) from the GEOSAT Exact Repeat Mission (ERM) for the time period of April 01, 1988 to May 04, 1988. 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. These data were submitted by the U.S. Navy via National Oceanic Service. The US Navy Geosat (Geodetic Satellite) 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 early October 1986 to begin the Exact Repeat Mission (ERM) which lasted from November 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. Data products are archived at the NODC.本存档包含1988年4月1日至1988年5月4日期间，大地卫星精确重复任务（GEOSAT Exact Repeat Mission, ERM）产生的一个月大地测量数据记录（Geodetic Data Records, GDRs）。所涉参数包括：时间、轨道、经纬度以及海面高度。数据校正项涵盖：海平面数据、风浪数据、潮汐、干对流层延迟、湿对流层延迟、电离层延迟、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。本数据集由美国海军通过国家海洋服务局提交。 美国海军大地卫星（Geodetic Satellite, Geosat）雷达高度计任务持续近5年（1985年3月至1990年1月），在全球海洋范围内累计采集约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），卫星地面轨迹在整个任务周期内均不重复。1986年10月初，卫星轨道进行调整，正式启动精确重复任务（ERM），该任务从1986年11月持续至1990年1月卫星停止运行。在ERM任务阶段，卫星每17天重复一次地面轨迹。数据最初由位于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。数据产品随后移交至NOAA国家海洋数据中心（National Oceanographic Data Center, NODC）进行分发，目前该类数据产品存档于NODC。