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美国国家航空航天局（NASA）艾姆斯研究中心已向业界发起信息邀请书（RFI），以征求对其满足城市空中交通（UAM）的发现和同步服务（DSS）提案的评论和反馈。
NASA’s Ames Research Centre has issued a request for information (RFI) from industry for comments and feedback on its proposals for a Discovery and Synchronization Service (DSS) that satisfies Urban Air Mobility (UAM) requirements.
该邀请书于2022年11月21日发表，至2023年1月6日回复。
The RFI was published on November 21, 2022 with a response date of January 6 2023.
“NASA的最终计划是获得初始原型和必要的工程支持以维持一段时间。”
“Ultimately, NASA intends to procure an initial prototype and necessary engineering support required to maintain it for a period of time.”
NASA的目的是让业界为DSS提供一个解决方案，以满足UAM需求。他们了解到这是一项研究工作，并且有些需求会发生改变，或在未来产生新的需求，所以NASA打算获得初始原型和必要的工程支持以维持一段时间。
NASA’s objective is to have industry provide a solution for the DSS that satisfies UAM requirements. Understanding that this is a research effort and some requirements are expected to change or new ones identified in the future, NASA intends to procure an initial prototype and necessary engineering support required to maintain it for a period of time.
下面列出了一些任务（逐字记录报告）：
Some of the tasks (verbatim report) are listed below:
承包商应检查当前NAS用于分发和访问数码数据的方法、技术和途径，以便为适当的终端用户提供共同的操作图像，这些用户包括但不限于空中交通管制员、航空公司调度员和固定基地运营商（FBOs）。同时，承包商应考虑未来五年计划会发生的改变，通过检查美国联邦航空管理局（FAA）即将运营的技术和能力收购渠道，扮演现有NAS基础设施的潜在角色，如FAA的全系统信息管理（SWIM）。
The contractor shall examine current methods, technologies, and approaches used in today’s NAS for distribution and access of digital data to enable common operating picture to the appropriate end-users, including, but not limited to Air Traffic Controllers, airline dispatchers, and Fixed base Operators (FBOs). The contractor shall also consider planned changes in the next five years by examining the FAA’s acquisition pipeline for technologies and capabilities that are expected to be operational soon. The contractor shall address the potential role of existing NAS infrastructure such as FAA’s System Wide Information Management (SWIM).
承包商应评价DSS解决方案的潜在原型，满足一下UAM需求：在遵守视觉飞行规则（VFR）和仪表飞行规则（IFR）的情况下当前NAS运营的互操作性；保障系统参与者之间进行安全的信息交流；提供多因素认证机制；提供启用日志记录的机制;满足高度分布式系统稳健性要求，例如可用性和容错性;为相关的UAM系统参与者提供共同的运营情况，包括但不限于空中交通管制员，PSU，机队运营商，垂直升降机机场运营商和飞行员/飞机，以支持UAM的合作交通管理;确定共享资源的相关需求。
The contractor shall evaluate potential prototype DSS solutions that satisfy the following UAM requirements: Interoperability with current NAS operations under VFR and IFR; secure exchange of information among system actors; provide a multi-factor authentication mechanism; provide a role-based authorization mechanism; provide a mechanism to enable logging; system robustness requirements, such as availability and fault tolerance, for a highly distributed system; provision of a common operating picture for relevant UAM system actors including, but not limited to, ATC, PSU, Fleet Operator, Vertiport Operator, and pilots / aircraft, to support cooperative traffic management for UAM; identify relevant demand at shared resources.