COPY: Lecture 5 Global Positioning Systems
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Questions and Answers

What is the primary reason GPS requires four satellites to fix a 3D position?

  • To compute altitude through trilateration. (correct)
  • To enhance precision in signal processing.
  • To account for temporal offsets.
  • To determine latitude and longitude.

    • Which segment is NOT a part of the GPS system?

  • User segment
  • Space segment
  • Monitoring segment (correct)
  • Control segment

    • The operational management of GPS is carried out by which organization?

  • NASA
  • US Department of Defence (correct)
  • National Oceanic and Atmospheric Administration
  • Federal Aviation Administration

    • How is the concept of trilateration applied in GPS positioning?

    <p>By determining the distance from multiple satellites to intersect a point.</p> Signup and view all the answers

    What is one of the main uses of GPS in research projects?

    <p>Measuring atmospheric parameters.</p> Signup and view all the answers

    Where is the Master Control facility located?

    <p>Schriever AFB in Colorado Springs</p> Signup and view all the answers

    What is the primary function of a GPS receiver?

    <p>To convert satellite signals into position, velocity, and time estimates</p> Signup and view all the answers

    How many satellites are needed to compute position and time accurately?

    <p>Four</p> Signup and view all the answers

    What process is used to determine a user's position in GPS?

    <p>Trilateration</p> Signup and view all the answers

    What happens when the distance to three satellites is known during trilateration?

    <p>One point is usually rejected due to impossibility.</p> Signup and view all the answers

    Which of the following is NOT a component of the User Segment?

    <p>Satellites</p> Signup and view all the answers

    What is utilized by the Master Control station to enhance satellite performance?

    <p>Ephemeris and clock data</p> Signup and view all the answers

    What is a common application for GPS receivers?

    <p>Navigating and positioning</p> Signup and view all the answers

    What is GPS primarily designed for?

    <p>Global positioning and navigation for various users</p> Signup and view all the answers

    Which segment of GPS is responsible for sending signals from space?

    <p>Space Segment</p> Signup and view all the answers

    How many satellites constitute the GPS operational constellation?

    <p>24</p> Signup and view all the answers

    What altitude do GPS satellites orbit the Earth?

    <p>20,200 km</p> Signup and view all the answers

    What does the Control Segment of GPS consist of?

    <p>Tracking stations around the world</p> Signup and view all the answers

    Which component of GPS is critical for synchronizing time for accuracy?

    <p>The satellites' atomic clocks</p> Signup and view all the answers

    What type of signals do GPS satellites provide for computation?

    <p>Specially coded satellite signals</p> Signup and view all the answers

    What is the purpose of having multiple satellites visible from any point on Earth?

    <p>To enable accurate position calculations in three dimensions</p> Signup and view all the answers

    How can the distance from a satellite to a receiver be calculated using a radio signal?

    <p>Distance = Velocity x Time</p> Signup and view all the answers

    What is the speed of radio waves as they travel through space?

    <p>186,000 miles/second</p> Signup and view all the answers

    What is necessary for the GPS system to determine accurate locations?

    <p>The clocks of the satellite and receiver must be perfectly synchronized.</p> Signup and view all the answers

    How does GPS correct for differences in time between the receiver and satellite?

    <p>Through iterative adjustments until a unique solution is found.</p> Signup and view all the answers

    What role does the fourth satellite play in the GPS system?

    <p>It allows the receiver to synchronize its clock.</p> Signup and view all the answers

    Why is accuracy in satellite timekeeping crucial for GPS technology?

    <p>It affects the calculation of travel time and distance.</p> Signup and view all the answers

    What is the consequence of a clock error in the GPS receiver?

    <p>It alters the calculated position to a wrong point.</p> Signup and view all the answers

    How does the receiver ultimately achieve the precision required for positioning?

    <p>By continuously iterating until a unique intersecting point is found.</p> Signup and view all the answers

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