Practice Errors In Gnss Observations (3.4.11) - EGNOS, Europe

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10 questions

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6 sample questions

Question 1.
What can cause signal blockage when using GNSS?
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Think of where you find tall structures.
Question 2.
What is multipath error?
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Consider a bouncing ball.
3Question 3.
What is the main cause of multipath error in GNSS?
- A. Signals being blocked
- B. Reflection of signals off surfaces
- C. Errors in satellite positioning
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Think about how light bounces.
4Question 4.
True or False: Receiver clocks are generally more accurate than satellite atomic clocks.
- True
- False
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Consider the reliability of different types of clocks.
Question 5.
A GNSS receiver is positioned near tall buildings. It experiences a 3-meter error due to signal blockage. How could this issue be reduced if the receiver is frequently used in urban areas?
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Think about how you could improve the environment around the GNSS receiver.
Question 6.
Describe how you would measure and mitigate atmospheric delays when conducting a GNSS survey in varying weather conditions.
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Consider what weather impacts signal travel times.

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