GCRI · Spazio e osservazione della Terra

Comunicazioni e navigazione

Satellite communications connect remote areas, ships, aircraft and disaster zones, and navigation satellites provide the position and timing that transport, telecom, finance and power grids depend on. Large new constellations are changing both. This page sets out how satellite communication and navigation services work, how society’s dependence on them can be mapped, and what evidence serves the regulators and operators who plan for their loss.

01Registrare

Communications and navigation on the record.

02La domanda

Communications and navigation: how the risk develops.

GNSS, satcom and dependency. The dossier below sets out how the risk develops, what is measured, where the data come from, how it is modelled and who decides.

Meccanismo

Constellations change connectivity

Large low Earth orbit constellations offer lower latency broadband, extending coverage but concentrating it with a few operators.

Meccanismo

Timing is a hidden dependency

Telecom networks, power grid measurement and financial sistemi use satellite time signals. Many users do not know they depend on them.

Meccanismo

Navigation underpins transport

Aviation, shipping, road logistics and agriculture rely on satellite positioning, with augmentation systems for higher accuracy and integrity.

Meccanismo

Backups are often missing

Alternative positioning and timing, such as terrestrial systems or holdover clocks, are unevenly deployed, so outages can cascade.

03Metodi ed evidenze

How communications and navigation is modelled, measured and tested.

Il modello, le sue ipotesi, i suoi dati e la sua incertezza, nella forma in cui uno scienziato o un ingegnere li verificherebbe. Le strutture seguono metodi pubblicati. I valori rappresentati sono illustrativi, non risultati.

Catena di osservazione della Terra

How a satellite or sensor record becomes evidence on communications and navigation, and where each step adds uncertainty.

  1. 01 · Acquisireorbita, sensore e rivisitaIncertezza: lacune dovute a nuvole e orbita
  2. 02 · Calibrareradiometrico e geometricoIncertezza: deriva dei sensori
  3. 03 · Correggereatmosfera e terrenoIncertezza: ipotesi su aerosol e pendenza
  4. 04 · Recuperare o classificarela variabile o la classeIncertezza: errore del modello e di addestramento
  5. 05 · Convalidarerispetto alla verità a terraIncertezza: disegno e dimensione del campione
  6. 06 · Pubblicarecon barre di errore e lignaggioIncertezza: dichiarata, mai nascosta
Catena di elaborazione nel senso dei CEOS Analysis Ready Data; ogni fase registra la propria incertezza prima che venga tracciata una cifra. Una struttura generica, non risultati.
Principi guida FAIR · GO FAIR e FORCE11W3C PROV · World Wide Web ConsortiumGuidance on consistent treatment of uncertainties · IPCCCEOS Analysis Ready Data · Comitato sui satelliti per l'osservazione della Terra
04Tra i domini

Satellite communication and navigation reach every domain.

Findings are designed for the serie Strategic Systems. Spectrum is governed by the ITU Radio Regulations; the Global Centre for Risk and Innovation (GCRI) recommends no provider.

  • Interference and outage records.
  • Connectivity studies in remote areas.
05Indicatori

Cosa viene misurato e con quale accuratezza.

Ogni indicatore riporta la sua unità, la sua cadenza, il tipo di fonte su cui si basa e l'etichetta di evidenza che un valore riporterebbe. Non sono mostrati valori: un programma li fornisce sotto la propria autorità.

IndicatoreUnitàCadenzaTipo di fonteEtichetta
Population covered by satellite broadbandpercent of populationannualeRegulator and operator dataSTIMATO
Critical sectors using GNSS timingcount of sectorsper valutazioneDependency studiesSTIMATO
Timing holdover capabilityhoursper systemOperator documentationDICHIARATO
Satellite broadband subscribersconteggioannualeRegulator statisticsStatistiche pubblicate
Satellite-based augmentation coveragestatus by regionper valutazioneAugmentation system documentationStatistiche pubblicate
Navigation outages and degradationscount and durationannualeService noticesStatistiche pubblicate
06Fonti

Da dove provengono le evidenze.

Set di dati pubblici e registri istituzionali specifici, ciascuno con la sua classe di licenza. Le fonti soggette ad accordo sono utilizzate solo alle relative condizioni e mai ripubblicate.

FonteCosa fornisceClasse di licenza
ITU satellite network filings and Radio RegulationsSpectrum and orbit filingsPublic, ITU terms
GNSS service performance reports (GPS, Galileo, GLONASS, BeiDou)Service performance and noticesPublic, terms per provider
Government studies of GNSS dependence, such as the UK and US economic impact studiesSectors depending on positioning and timingPublic records, licence per government
National telecom regulator statisticsSatellite broadband adoptionPublic records, licence per regulator
ICAO and IMO documentation on navigationNavigation requirements in aviation and shippingPublic, terms per organisation
07Decisioni

Chi decide, e a cosa servono le evidenze.

Space and Earth Observation prepares evidence. The decisions below are taken by the authorities named, under their own rules, and never by the platform.

Chi decideLa domandaEvidenze fornite da questa pagina
Telecom and transport regulatorsWhat backup timing and navigation to requireDependency maps; backup reviews
Infrastrutture critiche operatorsHow long they can operate without satellite timingHoldover evidence
Governments planning connectivityWhere satellite broadband fills gapsConnectivity gap analyses

Output prodotti da questo argomento

  • Dependency maps of positioning and timing
  • Backup capability reviews
  • Connectivity gap analyses including satellite options
  • Evidence notes for resilience planning
08Questioni centrali

Cosa si chiedono gli esperti.

Specialists in navigation and satellite communications ask how dependent sistemi are and how they fail.

  • Which sectors rely on satellite timing and positioning, and do they know it?
  • How vulnerable are receivers to jamming, spoofing and interference?
  • What alternative time and position sources exist, and are they in use?
  • How do satellite communications support emergency response and remote areas, and how resilient are they?
  • How does the growth of large communications constellations change dependency and risk?
09Meccanismi e fattori

Weak signals, wide dependence.

Navigation satellites broadcast signals that receivers use to calculate position and time. The signals are very weak by the time they reach the ground, which makes them easy to drown out with jamming or imitate with spoofing. Beyond navigation for transport and agriculture, the timing function is embedded in telecommunications networks, electricity grid synchronisation and the time-stamping of financial transactions, often without operators being aware of it.

Satellite communications carry data, voice and broadband to ships, aircraft, remote communities and disaster zones where terrestrial networks are absent or damaged. They are themselves exposed to interference, ground-segment faults and space weather. Resilience comes from diversity: multiple constellations, terrestrial backups, holdover clocks that maintain time during outages, and receivers that detect anomalies.

10Metodi e dati

Come si costruiscono le evidenze e dove si fermano.

  1. 01

    Dependency surveys

    Identifying where timing and positioning are used in critical services. Embedded dependencies are often undocumented.

  2. 02

    Interference monitoring

    Detecting jamming and spoofing through receiver networks and communications and network technology. Coverage of monitoring is limited.

  3. 03

    Test di resilienza

    Testing how sistemi behave when signals are lost or falsified. Live testing is constrained by regulation and safety.

  4. 04

    Signal and orbit physics

    Modelling signal propagation and errors, grounded in fisica. Atmospheric effects vary in ways that are hard to predict locally.

12Where this page’s references

Where this page’s references lead.

Gli organismi e i documenti alla luce dei quali si legge questa pagina. Stato ed edizioni cambiano; ogni link porta all'organismo emittente.

13Domande

Domande e risposte.

What is GNSS?
Global navigation satellite systems, such as GPS, Galileo, GLONASS and BeiDou, which provide positioning, navigation and timing worldwide.
Why do power grids and banks depend on satellites?
Because many of their systems use satellite time signals to synchronise measurements across sites and to timestamp transactions.
What is a low Earth orbit constellation?
A large group of satellites orbiting relatively close to Earth, used to provide low-latency communications coverage.
Why does finance depend on satellite navigation?
Many systems use satellite-derived time to stamp and order transactions precisely. Loss of that time source, without a backup, can disrupt synchronisation.
What is spoofing?
Broadcasting false navigation signals so that receivers compute a wrong position or time. Unlike jamming, it can go unnoticed without detection measures.
Are there alternatives to satellite timing?
Yes. Terrestrial time distribution, atomic clocks with holdover and multiple constellations can provide resilience. Their adoption varies widely.
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