Communications & AOCS

Which Frequency band is usually used for Commercial Communication satellites?

• UHF band

• X band

• Ku band

• Ka band

What is the gain of an antenna?

• The gain of an antenna is a measure of how well the antenna converts input power into radio waves and vice versa.
• The gain of an antenna is a measure of how well the antenna amplifies sound waves
• The gain of an antenna is a measure of how well the antenna converts input power into heat
• The gain of an antenna is a measure of how well the antenna receives TV signals

What basic modulation method is typically used for space communication?

• Amplitude modulation (ASK)

• Frequency modulation (FSK)

• Phase modulation (PSK)

What is the most important aspect of a com link to an astronaut?

• Video

• Voice

• Telemetry

What do you need to consider when applying communications in Human Spaceflight?

• Redundancy & Robustness

• Transmission of high quality PR material

• Human Factors

• Privacy

Why do you need a defined and stable orbit?

• To allow rendezvous manoeuvre

• To avoid collisions

• To experience different gravitational pulls
• To be closer to the celestial body

Why do you need a defined and stable attitude for space stations in space?

• To allow microgravity experiments

• To provide a comfortable living environment for astronauts
• To allow safe docking operations

• To create artificial gravity

What influences the atmospheric density in LEO?

• The color of the spacecraft

• The phase of the moon and the position of the stars
• number of satellites in orbit

• Solar activity, Day/night cycles

Which one is not a typical flight mode?

• Earth Oriented Flight Mode

• Sun Oriented Flight Mode

• Interial Flight Mode