GCRI · فضا و زمین‌دیده‌وری
ارتباطات و ناوبری
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.
Communications and navigation on the record.
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.
Constellations change connectivity
Large low Earth orbit constellations offer lower latency broadband, extending coverage but concentrating it with a few operators.
Timing is a hidden dependency
Telecom networks, power grid measurement and financial سامانه‌ها use satellite time signals. Many users do not know they depend on them.
Navigation underpins transport
Aviation, shipping, road logistics and agriculture rely on satellite positioning, with augmentation systems for higher accuracy and integrity.
Backups are often missing
Alternative positioning and timing, such as terrestrial systems or holdover clocks, are unevenly deployed, so outages can cascade.
How communications and navigation is modelled, measured and tested.
مدل، مفروضات، داده‌ها و عدم قطعیت آن، به شکلی که دانشمند یا مهندس بررسی می‌کند. ساختارها از روش‌های منتشرشده پیروی می‌کنند. مقادیر ترسیم‌شده تبیینی‌اند، نه یافته.
زنجیرهٔ زمین‌دیده‌وری
How a satellite or sensor record becomes evidence on communications and navigation, and where each step adds uncertainty.
- 01 · اکتسابمدار، حسگر و بازدید مجددعدم قطعیت: شکاف‌های ناشی از ابر و مدار
- 02 · واسنجیرادیومتریک و هندسیعدم قطعیت: رانش حسگر
- 03 · اصلاحجو و زمین‌ریختعدم قطعیت: مفروضات ذرات معلق و شیب
- 04 · بازیابی یا رده‌بندیمتغیر یا طبقهعدم قطعیت: خطای مدل و آموزش
- 05 · اعتبارسنجیدر برابر واقعیت زمینیعدم قطعیت: طرح و اندازهٔ نمونه
- 06 · انتشاربا نوار خطا و تبارنامهعدم قطعیت: اعلام‌شده، نه پنهان
Satellite communication and navigation reach every domain.
Findings are designed for the مجموعهٔ نظام‌های راهبردی. 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.
What is measured, and how well.
Each indicator carries its unit, its cadence, the kind of source behind it and the evidence label a value would carry. No values are shown: a programme supplies them under its own authority.
| Indicator | Unit | دورهٔ تکرار | Source type | برچسب |
|---|---|---|---|---|
| Population covered by satellite broadband | percent of population | annual | Regulator and operator data | برآوردشده |
| Critical sectors using GNSS timing | count of sectors | per assessment | Dependency studies | برآوردشده |
| Timing holdover capability | hours | per system | Operator documentation | DECLARED |
| Satellite broadband subscribers | count | annual | Regulator statistics | آمارهای منتشرشده |
| Satellite-based augmentation coverage | status by region | per assessment | Augmentation system documentation | آمارهای منتشرشده |
| Navigation outages and degradations | count and duration | annual | Service notices | آمارهای منتشرشده |
Where the evidence comes from.
Named public datasets and institutional records, each with its licence class. Sources by agreement are used only under their terms and never republished.
| منبع | What it gives | Licence class |
|---|---|---|
| ITU satellite network filings and Radio Regulations | Spectrum and orbit filings | Public, ITU terms |
| GNSS service performance reports (GPS, Galileo, GLONASS, BeiDou) | Service performance and notices | Public, terms per provider |
| Government studies of GNSS dependence, such as the UK and US economic impact studies | Sectors depending on positioning and timing | Public records, licence per government |
| National telecom regulator statistics | Satellite broadband adoption | Public records, licence per regulator |
| ICAO and IMO documentation on navigation | Navigation requirements in aviation and shipping | Public, terms per organisation |
Who decides, and what the evidence serves.
Space and Earth Observation prepares evidence. The decisions below are taken by the authorities named, under their own rules, and never by the platform.
| چه کسی تصمیم می‌گیرد | The question | Evidence this page serves |
|---|---|---|
| Telecom and transport regulators | What backup timing and navigation to require | Dependency maps; backup reviews |
| زیرساخت‌های حیاتی operators | How long they can operate without satellite timing | Holdover evidence |
| Governments planning connectivity | Where satellite broadband fills gaps | Connectivity gap analyses |
Outputs this topic produces
- Dependency maps of positioning and timing
- Backup capability reviews
- Connectivity gap analyses including satellite options
- Evidence notes for resilience planning
What experts ask.
Specialists in navigation and satellite communications ask how dependent سامانه‌ها 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?
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.
How the evidence is built, and where it stops.
- 01
Dependency surveys
Identifying where timing and positioning are used in critical services. Embedded dependencies are often undocumented.
- 02
Interference monitoring
Detecting jamming and spoofing through receiver networks and communications and network technology. Coverage of monitoring is limited.
- 03
Resilience testing
Testing how سامانه‌ها behave when signals are lost or falsified. Live testing is constrained by regulation and safety.
- 04
Signal and orbit physics
Modelling signal propagation and errors, grounded in physics. Atmospheric effects vary in ways that are hard to predict locally.
How it is studied, and what the methods cannot say.
- 01فناوری ارتباطات و شبکهData distribution to users · Spectrum protection for EO · Ground station networksApplied here
- 02سامانه‌های فضایی و خدمات ماهواره‌ایMission continuity analysis · Space segment resilience · Debris compliance assessmentApplied here
- 03نظام‌های اطلاعات مکانیIntegrating EO with administrative data · Catalogues and interoperabilityApplied here
- 04فیزیک و علم کوانتومRadiative transfer for atmospheric correction · Microwave scattering · Orbit determinationApplied here
Where this page’s references lead.
نهادها و اسنادی که این صفحه بر پایهٔ آن‌ها خوانده می‌شود. وضعیت و ویراست‌ها تغییر می‌کنند؛ هر پیوند به نهاد صادرکننده می‌رود.
پرسش و پاسخ.
What is GNSS?
Why do power grids and banks depend on satellites?
What is a low Earth orbit constellation?
Why does finance depend on satellite navigation?
What is spoofing?
Are there alternatives to satellite timing?
شواهد را از همین صفحه ارسال کنید.
گزارش‌ها 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.
- ایمیلدرگاه GW-GCRIاز همین صفحه ارسال کنیدشواهد، یک اصلاحیه، یک مورد، یک روش، یک داوری، یک ترجمه یا ورودی نمایه. با برچسب این صفحه میرسد تا ویراستار مسئول آن را دریافت کند.
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- گزارش‌هاGCRIهمهٔ راههای مشارکت را ببینیدانواع مشارکت، نحوهٔ بررسی هر یک، اعتباری که دریافت میکنید، مجوز و آنچه هرگز پذیرفته نمیشود.
هرگز داده شخصی، جزئیات حساس زیرساخت یا چیزی را که حق اشتراکش را ندارید نفرستید. هر مشارکت پیش از استفاده داوری می‌شود؛ ارسال آن حق مؤلفی یا ویرایشی نمی‌دهد و حمایت مالی هرگز یافته‌ای را نمی‌خرد.
یک روش، یک مجموعه‌داده یا یک پرسش بیاورید.
اطلاعات و درخواست‌ها امروز باز است. هر درخواست یک شمارهٔ پیگیری می‌گیرد و گام بعدی را مشخص می‌کند؛ درخواست‌های عضویت، پرداخت‌ها، تخصیص رایانش و ثبت‌نام‌ها تنها زمانی باز می‌شوند که تیم، شرایط و ظرفیت داوری آن‌ها فراهم باشد.
اسناد حقوقی.
نقشه‌ها، داده‌ها و ارقام این سایت برای زمینه و اطلاعات عمومی نشان داده می‌شوند. توصیه، پیش‌بینی یا هشدار نیستند؛ حدود این اطلاعات در سلب مسئولیت‌ها و اعلامیه‌های داده بیان شده است.