GFZ GRACE-FO-1 Rapid Science Orbits (version 2)

This dataset provides Rapid Science Orbits (RSO) from the Low Earth Orbiter (LEO) satellite GRACE-FO-1. It is part of the compilation of GFZ RSO products for various LEO missions and the appropriate GNSS constellation in sp3 format. The individual solutions for each satellite mission are published with individual DOI as part of the compilation (Schreiner et al., 2022). • The GRACE-FO RSO cover the period: - from 2019 049 to up-to-date The LEO RSOs in version 2 are generated based on the 30-hour GPS RSOs in two pieces for the actual day with arc lengths of 14 hours and overlaps of 2 hours. One starting at 22:00 and ending at 12:00, one starting at 10:00 and ending at 24:00. Due to the extended length of the constellation, there is no need to concatenate several constellations for day-overlapping arcs. The accuracy of the LEO RSOs is at the level of 1-2 cm in terms of SLR validation. Each solution in version 2 is given in the Conventional Terrestrial Reference System (CTS) based on the IERS 2010 conventions and related to the ITRF-2014 reference frame. The exact time covered by an arc is defined in the header of the files and indicated as well as in the filename.

本数据集提供近地轨道（Low Earth Orbiter, LEO）卫星GRACE-FO-1的快速科学轨道（Rapid Science Orbits, RSO）。本数据集属于德国波茨坦地学研究中心（GeoForschungsZentrum Potsdam, GFZ）针对各类近地轨道任务及适配全球导航卫星系统（Global Navigation Satellite System, GNSS）星群所编制的sp3格式RSO产品合集的组成部分。各卫星任务的独立轨道解算结果均以独立数字对象标识符（Digital Object Identifier, DOI）发布，作为该合集的组成部分（Schreiner等，2022）。
• GRACE-FO的快速科学轨道覆盖时段为：2019年第49天起至今。
版本2的近地轨道快速科学轨道基于当日两段各30小时的GPS快速科学轨道生成，两段轨道弧长均为14小时，重叠时长2小时：一段起始于当日22:00，终止于次日12:00；另一段起始于当日10:00，终止于当日24:00。由于星群覆盖时长充足，无需为跨日轨道弧拼接多段星群数据。
经卫星激光测距（Satellite Laser Ranging, SLR）验证，该版本近地轨道快速科学轨道的精度可达1~2厘米量级。
版本2的每份轨道解算结果均采用基于国际地球自转与参考系统服务（International Earth Rotation and Reference Systems Service, IERS）2010年规约的常规地面参考系统（Conventional Terrestrial Reference System, CTS），并关联至ITRF-2014参考框架。
单段轨道弧的精确覆盖时段在文件头中定义，同时也会在文件名中标注。