3l Satellite Communication Systems

Question 0

The employees use Global Positioning Systems (GPS) to navigate to the customers’ properties. Describe how satellites are used in GPS.(4 marks)

Answer 0

4 GPS receiver receives the signals from a satellite (1)
Minimum of four satellites required(1)
satellite transmits its location and time (1)
receiver times differences between satellite signals allows it to work out
position (1).

Question 1

The Mountain Rescue Team’s emergency vehicles are to have a satellite tracking system installed in them.
Describe two advantages of tracking its vehicles in this way (4 marks)

Answer 1

 the vehicle can be located (1) at any time (1)
 most appropriate vehicle (1) dispatched to closest emergency site (1)
 arrive within stated time (1) meeting response targets (1)
.
 if vehicle is stolen (1) location can be passed to police/vehicle retrieved (1)