GNSS timing dependency

Assembled from 22 blocks · 2 evidence · 17 related

1. Story
2. The dependency almost nobody counts. A GNSS receiver solves for time as well as position, which makes a cheap antenna on a rooftop an accurate atomic clock — and that turned out to be the service the wider economy actually built on. Mobile network base stations use it to keep transmissions from interfering; electricity grids use it to timestamp phasor measurements across hundreds of kilometres; financial venues use it to sequence orders and satisfy regulatory timestamping requirements; broadcast, data centres and industrial control systems use it to keep distributed clocks aligned. Because the signal is free, unauthenticated and arriving from twenty thousand kilometres away at a power level below the ambient noise floor, it is also easy to jam and easy to spoof, and the systems depending on it frequently have no independent holdover. A 2017 study prepared by London Economics for the United Kingdom estimated the cost of a five-day national GNSS outage at several billions of pounds — an estimate whose value is less in its precision than in demonstrating that the exposure had never previously been priced at all. Not a place.
3. Knowledge
4. Global navigation satellite systems
5. GNSS timing dependency
6. Connections
7. Global navigation satellite systems
8. A GPS ground-system error disrupts timing receivers worldwide
9. Upstream and downstream in space accounting
10. Orbital shells as distinct economic regimes
11. GPS (Navstar Global Positioning System)
12. Galileo
13. BeiDou Navigation Satellite System
14. GNSS timing dependency
15. The first Navstar GPS satellite launches
16. GPS reaches full operational capability
17. Selective Availability is switched off
18. Galileo declares initial services
19. BeiDou-3 completes deployment and enters global service
20. Evidence
21. Estimates the economic cost to the United Kingdom of a multi-day national GNSS outage, and enumerates the infrastructure sectors dependent on GNSS timing. V55 verification basis: the report was not retrieved in this session, so the headline figure is described only as several billions of pounds over five days rather than quoted.
22. Supports the GPS milestone dates (first Block I launch 1978, full operational capability 1995, Selective Availability discontinued 2000) and the standing policy that the civil GPS signal is provided worldwide free of direct user charge. V55 verification basis: gps.gov was not retrievable in this session; dates are stated from author knowledge and require confirmation.