Skip to content
Know.itKnow.it
Create an animated lesson
On request

This article is free to read. Creating a lesson uses your daily or stored credits; review the language and settings before starting.

How does satellite internet work?

TechnologyLesson on requestFree to read

Quick answer

Satellite internet works by transmitting data from a user's dish to a satellite in orbit, which relays it to a ground station linked to the internet. The response travels back the same way, enabling connectivity in remote areas but with higher latency than cable or fiber.

Satellite internet sends data between a user's dish and a satellite in orbit, which relays it to a ground station connected to the internet. This allows broadband access in remote areas where cables cannot reach.

Step by step

  1. A user's satellite dish sends a request for data to a satellite in orbit.
  2. The satellite receives the signal and transmits it to a ground station on Earth.
  3. The ground station connects to the internet and retrieves the requested information.
  4. The ground station sends the data back to the satellite.
  5. The satellite relays the data down to the user's dish.
  6. The user's modem converts the signal into usable internet data.

Key things to understand

  1. A user's satellite dish transmits data to a satellite orbiting Earth.
  2. The satellite receives the signal and sends it back to a ground station on Earth.
  3. The ground station connects to the internet backbone and retrieves requested data.
  4. The data is sent back to the satellite, which relays it to the user's dish.
  5. This round-trip creates higher latency than terrestrial internet due to the long distance.

Labelled diagram

  1. User dish

    Sends and receives radio signals to and from the satellite.

  2. Satellite

    Orbits Earth and relays signals between dish and ground station.

  3. Ground station

    Connected to the internet backbone, sends and receives data.

  4. Internet

    Global network that provides the requested content.

How satellite internet connects you

Real-world examples

  • Starlink uses thousands of low-Earth-orbit satellites to provide internet to rural areas.
  • HughesNet uses geostationary satellites to serve customers in remote parts of the United States.
  • Before an undersea cable arrived in 2020, India's Andaman and Nicobar Islands relied on satellite links for internet access.
  • Ships at sea use satellite internet to stay connected while far from land.

Common mistake

✗ Myth: Satellite internet is always slow and unreliable.

✓ Fact: Modern low-Earth-orbit systems offer speeds comparable to cable, though latency remains higher than fiber. Reliability depends on weather and line of sight.

People also ask

How does satellite internet work?
A dish sends a signal to a satellite, which relays it to a ground station connected to the internet. The response travels back via the satellite to the dish, enabling web access anywhere with a clear view of the sky.
What is the latency of satellite internet?
Geostationary satellites have latency around 600 milliseconds, while low-Earth-orbit satellites can achieve 20-40 milliseconds. Latency is the delay in data transmission, affecting real-time activities like gaming or video calls.
Can you use satellite internet for gaming?
Yes, but high latency can cause lag, especially with geostationary satellites. Low-Earth-orbit services like Starlink are better for gaming due to lower latency, though still not as good as fiber.
Why is satellite internet slower than cable or fiber?
The signal must travel thousands of kilometers to space and back, which adds delay. This distance also limits the speed of data transfer compared to cables.
What is the difference between GEO and LEO satellite internet?
GEO satellites orbit at about 35,786 km above the equator, causing high latency. LEO satellites orbit much closer, reducing latency but requiring many satellites for coverage.
Can satellite internet work during bad weather?
Heavy rain or snow can absorb and scatter the radio signals, causing temporary outages or slower speeds. This is called rain fade.
Do I need a clear view of the sky for satellite internet?
Yes, the dish must have an unobstructed line of sight to the satellite. Trees, buildings, or mountains can block the signal.

Part of the guide: How the Internet Works →