The frequency for a remote sensing spacecraft

 

1. Which frequency would be better to use for a remote sensing spacecraft: 7.5 x 1013 Hz
or 1.03 x 1014 Hz? Why?
2. Given a payload mass of 75 kg, estimate the spacecraft’s total mass and volume.
3. Describe the two major components of an attitude control subsystem – i.e. actuators
and sensors, and provide three examples of each.
4. Describe the three common momentum control devices. What are their main
differences?
5. What are disturbance torques and how do they affect a spacecraft? Calculate orders of
magnitude, rank order them and discuss their relative influence for a:
i. LEO satellite
ii. GEO satellite
6. Given a payload mass of 75 kg, estimate the spacecraft’s total mass and volume. 2. Describe
the two major components of an attitude control subsystem – i.e. actuators and sensors, and
provide three examples of each. 3. Describe the three common momentum control devices.
What are their main differences? 4. What are disturbance torques and how do they affect a
spacecraft? Calculate orders of magnitude, rank order them and discuss their relative influence
for a: i. LEO satellite ii. GEO satellite 5. What is momentum dumping? When and why is
momentum dumping needed?

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