Geosat Geodetic Mission Waveform Data Records (WDR) for July, 1986 (NODC Accession 0002564)

This accession contains one month of waveform data records (WDRs) from the GEOSAT Geodetic Mission (GM) and(or) Exact Repeat Mission (ERM) for the time period of July 01, 1986 to July 31, 1986. 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 October 1986 to begin the Exact Repeat Mission (ERM) which lasted from November 8, 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1986年7月1日至1986年7月31日这一个月期间，GEOSAT大地测量任务（Geodetic Mission, GM）与（或）精确重复任务（Exact Repeat Mission, ERM）的波形数据记录（waveform data records, WDRs）。数据集参数涵盖时间、轨道、经纬度及海面高度。数据校正项包括：海平面校正、风浪数据校正、潮汐校正、干对流层与湿对流层校正、电离层校正、高度偏差校正、高度计交叉轨迹差值校正、高度计海面测量校正以及航天器姿态校正。本数据集由美国海军通过国家海洋服务局提交。

美国海军GEOSAT（大地测量卫星）雷达高度计任务持续近5年（1985年3月至1990年1月），在全球海洋范围内收集了约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），卫星地面轨迹在任务周期内无重复。1986年10月，卫星轨道进行调整，以启动精确重复任务（ERM），该任务从1986年11月8日持续至1990年1月卫星失效。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）卫星高度计工作组协作处理。数据产品移交至NOAA国家海洋数据中心（National Oceanographic Data Center, NODC）进行分发，并由该中心存档保存。