Netw4009 Lecture 5 Exam

LEO (Low Earth Orbit) satellite systems are most suitable for satellite telephony services such as Thuraya and have the lowest latency. LEO satellites are positioned closer to the Earth's surface, resulting in shorter signal travel distances and therefore lower latency. This makes them ideal for real-time communication services like telephony, where low latency is crucial for clear and uninterrupted voice calls. MEO (Medium Earth Orbit), GEO (Geostationary Orbit), and HEO (Highly Elliptical Orbit) satellite systems have higher latencies compared to LEO, making them less suitable for satellite telephony services.

The MSS (Mobile Satellite System) is used to make telephone calls directly using satellites. It provides global coverage and allows users to communicate from any location, even in remote areas where traditional landline or cellular networks are unavailable. MSS systems utilize satellites to transmit and receive signals, enabling voice calls to be made over long distances without the need for physical infrastructure.

A satellite system that is positioned below the lower Van Allen belt is known as LEO, which stands for Low Earth Orbit. Satellites in LEO have an altitude between 160 to 2,000 kilometers above the Earth's surface. Being closer to the Earth allows LEO satellites to have shorter communication delays and lower latency. They are commonly used for applications such as telecommunications, weather monitoring, and Earth observation.

The correct answer is LEO (Low Earth Orbit). The Global-star satellite system is considered as LEO because it operates in a low orbit around the Earth, typically at an altitude of less than 2,000 kilometers. LEO satellites have a shorter orbital period and provide lower latency compared to satellites in higher orbits. They are commonly used for communication and navigation purposes, as they offer better coverage and faster data transmission.

A geostationary satellite has a circular GEO (Geostationary Earth Orbit) orbit. This means that the satellite orbits the Earth at the same rate as the Earth's rotation, allowing it to appear stationary from the ground. A circular orbit is necessary for maintaining a consistent position above a specific point on the Earth's surface, which is a key characteristic of geostationary satellites.