Final Exam

 

Questions Total 100 points

 

1. DBS technology.

 

a. DBS satellite signal is typically in 12 GHz band, but it is down-converted to the .95 - 1.45 GHz band. Why is this conversion necessary or why is this conversion done? (20 points)

b. How are errors corrected? (5 points)

 

2. When did the satellite communication begin and what is the name of the first communication satellite? (10 points)

 

3. What is the difference between geostationary and geosynchronous orbits? (10 points)

 

4. The satellite orbit can be classified by its altitude, which gives rise to the terms LEO, MEO, GEO, etc.  

 

i) What orbit is GPS satellites located? Why is GPS satellite located at this orbit? Argue why this is the right or wrong orbit for the GPS satellites. Provide detailed answers. (10 points)

 

ii) What orbit is NOAA GOES weather satellite located? Why is GOES at this orbit? Argue why this is the right or wrong orbit for GOES. Provide detailed answers. (10 points)

 

iii) If you would like to provide communication coverage for people who live at high northern latitudes just below the north pole over 11-hour time zones, in what orbit would you place your communication satellite and why? You are allowed to have up to 2 satellites. Provide detailed answer. (10 points) 

 

5. Before components of the satellite are sent to space, they have to go through space qualification process, which includes radiation hardening. This process can be very costly. A radiation hardened component costs a lot more than its nonradiation hardened counterpart.    Research a component (pick any component, for example computer memory) of a satellite and find out the cost for making that component radiation hardened (rad-hard).  (10 points)

 

6. A VSAT antenna would allow an end user to receive TV programs at home directly from satellites. Do you think that the number of people who use VSAT antennas for watching TV is increasing or decreasing in the US and why? Provide detailed answers. (10 points)

 

7. Our reliance on GPS for navigation is increasing.  However, we always need to be aware that GPS signal can be disrupted which can result in loss of tracking. Name and describe one of the sources of disruption. (5 points)

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