A novel systems engineering approach to the design of a precision radial velocity spectrograph: the GMT-Consortium Large Earth Finder (G-CLEF)
A novel systems engineering approach to the design of a precision radial velocity spectrograph: the GMT-Consortium Large Earth Finder (G-CLEF)
复制标题
用于设计精密径向速度摄谱仪的新颖系统工程方法：GMT 联盟大型地球探测器 (G-CLEF)
DOI：
10.1117/12.2056329
复制
发表时间：
2014
影响因子：
2.8
通讯作者：
I. Yuk
中科院分区：
文献类型：
--
作者：
W. Podgorski;J. Bean;H. Bergner;M. Chun;J. Crane;I. Evans;Janet D. Evans;G. Fűrész;D. Guzmán;Kang;K. McCracken;Mark Mueller;T. Norton;Chan Park;Sang C. Park;D. Plummer;A. Szentgyorgyi;A. Uomoto;I. Yuk
巨麦哲伦望远镜（GMT）的第一批轻型仪器之一将是GMT-Consortium Large Earth Telescope（G-CLEF）。这是一个光学波段中阶梯光栅光谱仪，是光纤馈送，以实现高稳定性。G-CLEF的关键能力之一将是其极其精确的径向速度（PRV）测量能力。RV的精度目标是10 cm/sec，预计将通过先进的校准方法和使用GMT自适应光学系统来实现。G-CLEF作为GMT工具套件的一部分，正在GMT的自动化需求管理系统中设计。这包括需求流、可跟踪性、错误预算和系统遵从性。错误预算正在被广泛采用，以帮助管理G-CLEF的技术要求，并确保最高级别的要求得到有效满足。在本文中，我们讨论了G-CLEF误差预算过程中，集中在PRV精度和仪器吞吐量预算。详细介绍了PRV错误预算过程，因为我们正在对PRV要求采取详细的系统错误预算方法。这已被证明是特别具有挑战性的，因为径向速度的精确测量是一个复杂的过程，具有难以建模的误差源和与RV测量不可或缺的复杂校准过程。PRV预算将传统建模和分析技术（如适用）与半经验技术（如必要）相结合。在预算编制过程中还使用了从现有的PRV工具中推断出的结果。
One of the first light instruments for the Giant Magellan Telescope (GMT) will be the GMT-Consortium Large Earth Finder (G-CLEF). It is an optical band echelle spectrograph that is fiber fed to enable high stability. One of the key capabilities of G-CLEF will be its extremely precise radial velocity (PRV) measurement capability. The RV precision goal is 10 cm/sec, which is expected to be achieved with advanced calibration methods and the use of the GMT adaptive optics system. G-CLEF, as part of the GMT suite of instruments, is being designed within GMT's automated requirements management system. This includes requirements flow down, traceability, error budgeting, and systems compliance. Error budgeting is being employed extensively to help manage G-CLEF technical requirements and ensure that the top level requirements are met efficiently. In this paper we discuss the G-CLEF error budgeting process, concentrating on the PRV precision and instrument throughput budgets. The PRV error budgeting process is covered in detail, as we are taking a detailed systems error budgeting approach to the PRV requirement. This has proven particularly challenging, as the precise measurement of radial velocity is a complex process, with error sources that are difficult to model and a complex calibration process that is integral to the RV measurement. The PRV budget combines traditional modeling and analysis techniques, where applicable, with semi-empirical techniques, as necessary. Extrapolation from existing PRV instruments is also used in the budgeting process.