UAS Communication Systems and Data Links 2

Question 1

The 5.8 GHz frequency band is most commonly used for which function in UAS systems?

Accepted Answer

Analog or digital video downlink (FPV transmission)

Answer

Command and control (C2) uplink to the aircraft

Answer

GPS satellite signal reception

Answer

Air traffic control voice communication

Question 2

In UAS communications, what does 'link budget' describe?

Accepted Answer

The accounting of all signal power gains and losses across a communication link to determine reliability

Answer

The financial cost of purchasing communication hardware

Answer

The number of simultaneous data channels the system supports

Answer

The regulatory frequency allocation granted by the FCC

Question 3

Which antenna type is best suited for UAS ground station use when the aircraft may fly in any direction from the operator?

Accepted Answer

Omnidirectional antenna

Answer

High-gain directional Yagi antenna

Answer

Narrow-beam parabolic dish antenna

Answer

Fixed-sector patch antenna

Question 4

What is the primary operational impact of RF interference on a UAS control link?

Accepted Answer

Degraded or lost link reliability, potentially causing loss of control

Answer

Increased battery consumption in the aircraft

Answer

Amplification of the GPS positioning signal

Answer

Automatic activation of altitude hold mode

Question 5

What is the purpose of a 'failsafe' function in a UAS communication system?

Accepted Answer

To execute a pre-programmed response (e.g., return-to-home or land) when the C2 link is lost

Answer

To encrypt the video downlink when streaming to external services

Answer

To automatically increase transmitter power when signal quality drops

Answer

To switch to a backup GPS constellation if the primary signal is unavailable

Question 6

In UAS control systems, what does 'latency' refer to?

Accepted Answer

The time delay between a pilot input and the aircraft's execution of that command

Answer

The strength of the received radio signal at the aircraft

Answer

The rate at which data is transmitted over the control link

Answer

The encryption processing overhead on the flight controller

Question 7

Which U.S. regulatory body is responsible for allocating radio frequency spectrum used by UAS communication systems?

Accepted Answer

FCC (Federal Communications Commission)

Answer

FAA (Federal Aviation Administration)

Answer

NIST (National Institute of Standards and Technology)

Answer

NTIA (National Telecommunications and Information Administration) for private users