How does LOS and BLOS differ?

How does LOS and BLOS differ?

• A. LOS establishes link via satellite
• B. BLOS has link establishment through satellite or relay
• C. LOS requires relay
• D. BLOS uses direct line-of-sight

Answer: (B)

The main idea is how the control link is carried to reach beyond the direct radio range. Line-of-sight means the link between the ground control station and the drone has a clear, direct radio path with no intermediate devices needed, typically used for closer operations. Beyond-visual-line-of-sight, on the other hand, means the drone is outside that direct radio horizon, so the link isn’t feasible with a single direct path. To keep control beyond visual range, the system uses satellites or relay stations (or relay aircraft/ground relays) to carry the signal. That’s why the statement about a BLOS link being established through satellite or relay best describes the difference. The other options mix up the roles: LOS does not require a satellite or relay, and BLOS does not rely on direct line-of-sight.

The main idea is how the control link is carried to reach beyond the direct radio range. Line-of-sight means the link between the ground control station and the drone has a clear, direct radio path with no intermediate devices needed, typically used for closer operations. Beyond-visual-line-of-sight, on the other hand, means the drone is outside that direct radio horizon, so the link isn’t feasible with a single direct path. To keep control beyond visual range, the system uses satellites or relay stations (or relay aircraft/ground relays) to carry the signal. That’s why the statement about a BLOS link being established through satellite or relay best describes the difference. The other options mix up the roles: LOS does not require a satellite or relay, and BLOS does not rely on direct line-of-sight.