Quick Answer
Satellite phones can work without a clear view of the sky, but their performance may be affected by the number and quality of satellites in view. The system typically uses a network of satellites to provide coverage, and the more satellites available, the better the service will be.
Satellite Phone Technology
Satellite phones use a variety of frequencies, including L-band and S-band, to communicate with satellites in orbit around the Earth. To establish a connection, the phone must have a clear view of the satellite, but this view doesn’t necessarily require a completely unobstructed sky. In fact, many satellite phones can operate with a view of the horizon of around 20-30 degrees, which is less than the height of a typical tree.
System Architecture
The system architecture of satellite phones plays a crucial role in their ability to work without a clear view of the sky. Most satellite phones use a network of low-Earth orbit (LEO) satellites, which are in orbit at an altitude of around 500-800 km. These satellites are in constant motion, and the phone must be able to track them to maintain a connection. To improve performance, many satellite phone systems use a technique called “handover,” where the phone switches between different satellites as they come into view.
Interference and Obstacles
While satellite phones can work without a clear view of the sky, obstacles such as buildings, trees, and hills can still affect their performance. Multipath interference, which occurs when signals bounce off nearby objects and cause multiple copies of the signal to reach the phone, can also be a problem. To mitigate these issues, many satellite phones use techniques such as diversity reception, where multiple antennas are used to receive the signal and combine them to improve quality.
Find more answers
Browse the full Q&A library by topic, or jump back to the topic this question belongs to.