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GCRI · 우주와 지구관측

통신과 항법

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.

01등록

Communications and navigation on the record.

02질문

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.

메커니즘

Constellations change connectivity

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

메커니즘

Timing is a hidden dependency

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

메커니즘

Navigation underpins transport

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

메커니즘

Backups are often missing

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

03방법과 근거

How communications and navigation is modelled, measured and tested.

모형, 그 가정, 데이터, 불확실성을 과학자나 엔지니어가 확인할 형태로 제시합니다. 구조는 발행된 방법을 따릅니다. 제시된 값은 예시이며 결과가 아닙니다.

지구관측 체인

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

  1. 01 · 획득궤도, 센서, 재방문 주기불확실성: 구름과 궤도로 인한 공백
  2. 02 · 보정방사 및 기하 보정불확실성: 센서 드리프트
  3. 03 · 정정대기와 지형불확실성: 에어로졸 및 경사 가정
  4. 04 · 검색 또는 분류변수 또는 등급불확실성: 모형 및 학습 오차
  5. 05 · 검증실측 자료 대비불확실성: 표본 설계와 크기
  6. 06 · 발행오차 막대와 계통 포함불확실성: 명시하고, 숨기지 않음
CEOS 분석 준비 데이터(Analysis Ready Data) 의미의 처리 사슬로, 각 단계는 수치를 그리기 전에 불확실성을 기록합니다. 일반적인 구조이며 결과가 아닙니다.
FAIR 지침 원칙 · GO FAIR와 FORCE11W3C PROV · 월드 와이드 웹 컨소시엄불확실성의 일관된 처리에 관한 지침 · IPCCCEOS 분석 준비 데이터(Analysis Ready Data) · 지구관측위성위원회
04영역 전반

Satellite communication and navigation reach every domain.

Findings are designed for the 전략 시스템 시리즈. 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.
05지표

측정되는 것과 그 정확도.

각 지표에는 단위, 주기, 그 뒤의 출처 종류, 값에 붙을 근거 표시가 있습니다. 값은 표시하지 않습니다. 값은 프로그램이 자체 권한으로 제공합니다.

지표단위주기출처 유형라벨
Population covered by satellite broadbandpercent of population연간Regulator and operator data추정
Critical sectors using GNSS timingcount of sectors평가별Dependency studies추정
Timing holdover capabilityhoursper systemOperator documentation신고됨
Satellite broadband subscribers건수연간Regulator statistics공표 통계
Satellite-based augmentation coveragestatus by region평가별Augmentation system documentation공표 통계
Navigation outages and degradationscount and duration연간Service notices공표 통계
06출처

근거의 출처.

이름이 명시된 공개 데이터셋과 기관 기록으로, 각각 라이선스 등급이 있습니다. 협약에 따른 출처는 그 조건에 따라서만 사용하며 결코 재게시하지 않습니다.

출처제공하는 것라이선스 등급
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
07결정

누가 결정하며 근거는 무엇에 쓰이는지.

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

결정 주체질문이 페이지가 제공하는 근거
Telecom and transport regulatorsWhat backup timing and navigation to requireDependency maps; backup reviews
핵심 인프라 operatorsHow long they can operate without satellite timingHoldover evidence
Governments planning connectivityWhere satellite broadband fills gapsConnectivity gap analyses

이 주제가 생산하는 산출물

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

전문가가 묻는 것.

Specialists in navigation and satellite communications ask how dependent 시스템 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?
09메커니즘과 동인

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.

10방법과 데이터

근거가 구축되는 방식과 그 한계.

  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

    회복력 시험

    Testing how 시스템 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 물리학. Atmospheric effects vary in ways that are hard to predict locally.

12Where this page’s references

Where this page’s references lead.

이 페이지를 읽을 때 기준이 되는 기구와 문서. 상태와 판은 바뀌며, 각 링크는 발행 기구로 연결됩니다.

13질문

질문과 답변.

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.
보고서기여하기

이 페이지에서 증거를 기여하십시오.

보고서 is the Consortium’s quarterly publication. What you know about this subject can become evidence, a case or a correction in the next edition, credited to you and published under CC BY 4.0 where it is your own work.

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방법, 데이터세트 또는 질문을 가져오십시오.

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