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Consider the following statements about Global Positioning Systems (GPS): 1) The position of an object can be exactly determined by a single satellite 2) The position of the observer (moving person or vehicle) on the ground is determined by an orbiting satellite 3) Atomic clocks are fixed in satellites to calculate the positioning of the satellite to aid in determining travel times. 4) Absolute positioning, where an accuracy of 1 cm to 5 cm is needed, depends upon the health of the satellite Which of the above statements are correct?

Consider the following statements about Global Positioning Systems (GPS): 1) The position of an object can be exactly determined by a single satellite 2) The position of the observer (moving person or vehicle) on the ground is determined by an orbiting satellite 3) Atomic clocks are fixed in satellites to calculate the positioning of the satellite to aid in determining travel times. 4) Absolute positioning, where an accuracy of 1 cm to 5 cm is needed, depends upon the health of the satellite Which of the above statements are correct? Correct Answer 2, 3 and 4 only

The following table gives information regarding the Global Positioning System.

Global Positioning System

Characteristics of GPS
  1. For a stationary objects minimum, 3 satellites are required.
  2. For moving objects minimum, 4 satellites are required.
  3. The position of the observer (moving person or vehicle) on the ground is determined by an orbiting satellite
  4. Atomic clocks are fixed in satellites to calculate the positioning of the satellite to aid in determining travel times.
  5. Absolute positioning, where accuracy of 1 cm to 5 cm is needed, depends upon the health of the satellite.

Applications of GPS
  1. Geodetic Control surveys
  2. Cadastral surveys
  3. Photogrammetry, Remote sensing and Surveying
  4. Geographical Information systems (GIS)
  5. Military applications
    1. Navigation
    2. Tracking
    3. Bomb and missile guidance
    4. Rescue
    5. Map updation

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