Low-Earth Orbit (LEO) Satellite

Low-Earth Orbit (LEO) satellites are satellites that orbit the Earth at altitudes between approximately 160 and 2,000 kilometers. They are primarily used for telecommunications, including providing internet connectivity, because their proximity to the Earth allows for lower latency communications. However, their lower altitude means they cover smaller areas and require a larger number of satellites to maintain continuous coverage.

How It Works

LEO satellites orbit the Earth at relatively low altitudes, completing an orbit typically in about 90 to 120 minutes. Their fast orbital speed means they constantly move relative to the Earth's surface, necessitating a constellation of multiple satellites working together to provide seamless coverage. These satellites are equipped with communication transponders that relay signals between ground stations and user devices. Due to their proximity to the Earth, the signals experience less delay, enabling faster data transmission compared to higher orbit satellites.

The satellite constellations are designed to ensure overlapping coverage areas, allowing for continuous connectivity even as individual satellites move out of view. Ground stations communicate with LEO satellites via radio frequencies, and user terminals, such as satellite dishes or antennas, connect to the satellites to access services like internet or voice communication.

Common Use Cases

• Providing global internet coverage in remote or rural areas lacking traditional infrastructure.
• Enabling real-time communication and data transfer for military and emergency services.
• Supporting satellite-based IoT networks by connecting sensors and devices across wide areas.
• Facilitating satellite phone services in regions without cellular coverage.
• Enhancing navigation and location-based services with additional satellite signals.

Why It Matters

LEO satellites are increasingly important for expanding internet access to underserved populations worldwide, bridging the digital divide. Their low latency and high-speed capabilities make them attractive for consumers and enterprises seeking reliable connectivity. For IT professionals and those pursuing certifications, understanding LEO satellite technology is crucial as satellite communication becomes a more integral part of global networks, cloud services, and IoT ecosystems. Knowledge of LEO satellite systems also supports roles in <a href="https://www.ituonline.com/it-glossary/?letter=N&pagenum=3#term-network-planning" class="itu-glossary-inline-link">network planning, satellite operations, and cybersecurity, where satellite communication links are involved.