LOFT接地段
The LOFT Ground Segment
摘要：
LOFT是大型X射线计时天文台，是欧空局M3任务的候选者之一，于2013年底完成了评估阶段。LOFT配备了两种仪器，大面积探测器（LAD）和宽视场监视器（WFM）。LAD在每个轨道上对多个目标进行定点观测（约90分钟），每天提供约80 GB的专有数据（专有期为12个月）。WFM一次持续监测约1/3的天空，每天提供约100个源的数据，总共产生约20 GB的额外遥测数据。LOFT突发警报系统还识别车载明亮脉冲事件（例如，伽马射线暴，伽玛暴），并使用一个约15个甚高频接收器的专用系统向地面广播相应的位置和触发时间。所有WFM数据计划立即公布。在这篇文章中，我们总结了LOFT地面段（GS）的计划组织，如任务黄皮书1中所述。我们描述了欧空局和LOFT财团的预期GS贡献。审查了计划的LOFT数据产品以及数据流、存档和分发的细节。尽管LOFT没有被选择在M3中发射，但它的长期评估阶段（> 2年）导致了非常可靠的任务设计和有效的地面操作规划。
英文摘要：
LOFT, the Large Observatory For X-ray Timing, was one of the ESA M3 mission candidates that completed their assessment phase at the end of 2013. LOFT is equipped with two instruments, the Large Area Detector (LAD) and the Wide Field Monitor (WFM). The LAD performs pointed observations of several targets per orbit (~90 minutes), providing roughly ~80 GB of proprietary data per day (the proprietary period will be 12 months). The WFM continuously monitors about 1/3 of the sky at a time and provides data for about ~100 sources a day, resulting in a total of ~20 GB of additional telemetry. The LOFT Burst alert System additionally identifies on-board bright impulsive events (e.g., Gamma-ray Bursts, GRBs) and broadcasts the corresponding position and trigger time to the ground using a dedicated system of ~15 VHF receivers. All WFM data are planned to be made public immediately. In this contribution we summarize the planned organization of the LOFT ground segment (GS), as established in the mission Yellow Book 1 . We describe the expected GS contributions from ESA and the LOFT consortium. A review is provided of the planned LOFT data products and the details of the data flow, archiving and distribution. Despite LOFT was not selected for launch within the M3 call, its long assessment phase (> 2 years) led to a very solid mission design and an efficient planning of its ground operations.
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