Precise Orbit Solution for Swarm Using Space-Borne GPS Data and Optimized Pseudo-Stochastic Pulses
Precise Orbit Solution for Swarm Using Space-Borne GPS Data and Optimized Pseudo-Stochastic Pulses
复制标题
使用星载 GPS 数据和优化伪随机脉冲的群体精确轨道解决方案
DOI：
10.3390/s17030635
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发表时间：
2017-03-01
期刊：
影响因子：
3.9
通讯作者：
Li, Fupeng
中科院分区：
文献类型：
--
作者：
Zhang, Bingbing;Wang, Zhengtao;Li, Fupeng
Swarm 是欧洲航天局 (ESA) 的一个项目，于 2013 年 11 月 22 日发射，由三颗 Swarm 卫星组成。集群精确轨道对于上述项目的成功至关重要。本研究研究了在高电离层活动下如何使用星载 GPS 数据和优化的伪随机脉冲来确定群零差 (ZD) 简化动态轨道解。我们选择2014年10月1日至25日的Swarm星载GPS数据，并获得Swarm简化动态轨道。轨道质量通过 GPS 相位观测残差进行评估，并与 ESA 发布的精密科学轨道 (PSO) 进行比较。结果表明，时间间隔为 6 分钟、径向 (R)、沿轨 (T) 和跨轨 (N) 方向先验标准偏差 (STD) 为 10−2 mm/s 的伪随机脉冲针对 Swarm ZD 简化动态精确定轨 (POD) 进行了优化。在高电离层活动期间，Swarm GPS相位残差的平均均方根（RMS）在9-11毫米，Swarm轨道解决方案也与ESA发布的Swarm PSO进行了比较，Swarm轨道在R、T和N方向上的精度可以达到2-4厘米。独立卫星激光测距 (SLR) 验证表明 Swarm 简化动态轨道的精度为 2-4 厘米。 Swarm-B的轨道质量优于Swarm-A和Swarm-C。 Swarm轨道可应用于地磁、地电和重力场恢复。
Swarm is a European Space Agency (ESA) project that was launched on 22 November 2013, which consists of three Swarm satellites. Swarm precise orbits are essential to the success of the above project. This study investigates how well Swarm zero-differenced (ZD) reduced-dynamic orbit solutions can be determined using space-borne GPS data and optimized pseudo-stochastic pulses under high ionospheric activity. We choose Swarm space-borne GPS data from 1–25 October 2014, and Swarm reduced-dynamic orbits are obtained. Orbit quality is assessed by GPS phase observation residuals and compared with Precise Science Orbits (PSOs) released by ESA. Results show that pseudo-stochastic pulses with a time interval of 6 min and a priori standard deviation (STD) of 10−2 mm/s in radial (R), along-track (T) and cross-track (N) directions are optimized to Swarm ZD reduced-dynamic precise orbit determination (POD). During high ionospheric activity, the mean Root Mean Square (RMS) of Swarm GPS phase residuals is at 9–11 mm, Swarm orbit solutions are also compared with Swarm PSOs released by ESA and the accuracy of Swarm orbits can reach 2–4 cm in R, T and N directions. Independent Satellite Laser Ranging (SLR) validation indicates that Swarm reduced-dynamic orbits have an accuracy of 2–4 cm. Swarm-B orbit quality is better than those of Swarm-A and Swarm-C. The Swarm orbits can be applied to the geomagnetic, geoelectric and gravity field recovery.