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示意:卫星轨道、其地面扫描带或接收机保持的视线

Risk Academy(由 Nexus Consortium 牵头)· 技术与数字系统 · 网络、数字与空间系统系

Satellite positioning and timing, the threats to them and the backups

定位、导航与授时韧性

Phone networks, power grids, payment 系统 and aircraft all take position or time from satellites, often without their operators knowing how much.

01范围

该学科涵盖的内容

其课程与 实验 讲授的子主题。

课程
筹备中
层级
开发中
实验
开发中
  • GNSS 系统 and signals
  • 电信、电力和金融领域的时间安排
  • 干扰与欺骗
  • 空间天气对 GNSS 的影响
  • 干扰检测与监测
  • Backup PNT: eLoran, fibre timing, inertial and signals of opportunity
  • Resilient receivers and holdover clocks
  • 航空和海上 GNSS 干扰
  • PNT resilience policy and standards
02地图

为任意地点构建孪生

Search any place or open the world; the layers and generators follow positioning, navigation and timing resilience on the planet map, the globe and in 3D.

西康沃尔:Goonhilly 与 Porthcurno 海缆登陆站:学院孪生体的平面图。地形 0 至 245 m;4 面卫星天线;74 座通信桅杆和塔;12 个电话交换局;7 个数据中心和海缆登陆站;12 个小型机场;1 个电信办公室;通信线路 161 km;自 2023-10-17 起 729 个已知被利用的漏洞;夜间灯光,VIIRS 昼夜波段:3D 孪生体打开时实时读取。等高线每 25 m 取自高程网格;通信电缆按等级;地面基础设施以标记表示。
West Cornwall: Goonhilly and the Porthcurno cable landings, United Kingdom. 同一数据的平面图:根据内嵌网格绘制的等高线地形、按类型划分的已绘制地面基础设施、已绘制的电缆,以及下方的数值。3D 孪生在能够绘制它的设备上打开,且须在其数据和代码通过检查之后。
  • Terrain 0 to 245 m
  • 4 satellite dishes
  • 74 communication masts and towers
  • 12 telephone exchanges
  • 7 data centres and cable landing stations
  • 12 aerodromes
  • 1 telecom offices
  • Communication line 161 km
  • 729 known exploited vulnerabilities since 2023-10-17
  • Night-time lights, VIIRS day-night band: read live when the 3D twin opens
Credits and dates per layer are listed under the stage. Relief in the twin is exaggerated ×1.5 for legibility.

Drag to move, right drag or Shift with a drag to turn and tilt, Ctrl with the wheel to zoom. Keyboard: arrows move, Shift with arrows turn and tilt, + and – zoom, 0 resets, V steps through the views, Escape clears.

同一数据的平面图:根据内嵌网格绘制的等高线地形、按类型划分的已绘制地面基础设施、已绘制的电缆,以及下方的数值。3D 孪生在能够绘制它的设备上打开,且须在其数据和代码通过检查之后。

所示边界、名称和称谓并不意味着对任何领土的法律地位作出任何判断,亦不意味着认可或接受此类边界。国家:Natural Earth(公有领域)。

03主题

主题、方法与衡量指标、争论以及相关机构

该领域及其范围

面向电信、能源、金融和交通运营商、接收机工程师以及政策人员,帮助他们了解自身服务如何依赖卫星授时与定位,以及如何在没有卫星服务时保持运行。

04方法

从丢失卫星信号到授时预算:一个站点能保持多久

当卫星信号被干扰或欺骗时,站点时钟会从信号丢失时的频率偏移加上自身老化而漂移;累积的时间误差与网络所能容忍的预算相比,决定了该站点能够依靠守时(holdover)运行的小时数,而韧性决策则取决于时钟等级和补充授时源。

来源: Psiaki and Humphreys, GNSS Spoofing and Detection (2016); Ioannides, Pany and Gibbons, Known Vulnerabilities of Global Navigation Satellite Systems, Status, and Potential Mitigation Techniques (2016); Sadlier, Flytkjaer, Sabri and Herr, The economic impact on the UK of a disruption to GNSS (London Economics) (2017); Executive Order 13905, Strengthening National Resilience Through Responsible Use of Positioning, Navigation, and Timing Services (2020).

05概览

概览、中心与课程

定位、导航和授时韧性概览

risksacademy.comtechnology-digital学科

Positioning, navigation and timing resilience: 0 primary courses open, 0 in preparation and 0 also taught here, across 9 subtopics. Courses: none yet.Positioning, navigationand timing resilience
定位、导航和授时韧性概览
  • Open, 0
  • In preparation, 0
  • Subtopics, 9
Course codes from the curriculum; study levels L1 to L4.
孪生构建器为任意地点构建孪生实例:西康沃尔:古恩希利与波斯科诺海缆登陆点 · 4 个生成器 · 7 个图层 · 3 个工具
06控制台

How Positioning, navigation and timing resilience is taught, as a process you can run

按下播放,即可依据本页自身数据运行这一过程。

Process explorer

How Positioning, navigation and timing resilience is taught

14 steps5 个阶段

07学习

成就、实践场所,以及在整个生态系统中的实践

本学科的成就

  1. 课程成就

    以此为主修学科的每门课程各一项,通过该课程的评估活动后获得。

成就是对在此完成并经评估的学习的记录。 了解认可机制如何运作.

08参与

参与技术与数字系统

从您的身份出发。

09参考文献

核心参考文献与入门起点

Start with Ioannides, then Psiaki, then Volpe National Transportation 系统 Center.

10常见问题

问题、解答与关键术语

在这里学习免费吗?
是的。由Nexus Consortium领导的Risk Academy的所有课程和学习材料均可免费学习,可自定进度或随学习小组进行。常规参与不收取费用;有偿工作、实习和研究员项目另行安排。
完成一门课程能获得什么?
A completion record: the course, its version, the date and what was assessed, private by default and shared by you. It stacks into discipline, department and programme achievements. A record states what was studied and assessed and does not certify competence. A record is not a licence, a professional title or an employment status.
数据和地点从何而来?
Every faculty teaches on a twin of a real place built from open data. Each layer carries its provider, licence and date, and every result on the Academy states its source. Maps and figures are indicators for teaching, never an assessment of a place.
除定位、导航和授时韧性课程外,我如何参与?
组建由三至七人组成的能力小组,学习共同路径,在国家工作组中承担受监督的任务,或带领您所在机构的学员群组加入。 打开面向机构的页面.

关键术语

术语

GNSS

Global navigation satellite 系统, such as GPS, Galileo, GLONASS and BeiDou.

术语

欺骗(伪造)

广播虚假 GNSS 信号,使接收机算出错误的位置或时间。

术语

干扰(压制)

发射使接收机无法跟踪 GNSS 信号的无线电噪声。

术语

维持时间

The time a clock can keep accurate time after losing its reference signal.

报告贡献

从本页贡献证据。

Reports 是联合体的季度出版物。您对该主题的了解可以在下一期中成为证据、案例或更正,署您的名,并在属于您本人作品的情况下以 CC BY 4.0 发布。

Risk Academy
定位、导航与授时韧性

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