Question 6. The Global Positioning System (GPS) is the most widely used GNSS. In point form, briefly answer the following questions: i. Why is it necessary for a GPS receiver to observe at least four satellites in order to reliably measure its location on Earth? ii. Approximately what accuracy (horizontal and vertical) would you expect to achieve with a single, low cost, handheld GPS receiver? iii. Explain why differential GPS methods can be used to improve the accuracy of GPS measurements.

Structural Analysis
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Author:KASSIMALI, Aslam.
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Chapter2: Loads On Structures
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Question 6.
The Global Positioning System (GPS) is the most widely used GNSS. In point form,
briefly answer the following questions:
i.
Why is it necessary for a GPS receiver to observe at least four satellites in order to
reliably measure its location on Earth?
ii.
Approximately what accuracy (horizontal and vertical) would you expect to
achieve with a single, low cost, handheld GPS receiver?
Explain why differential GPS methods can be used to improve the accuracy of GPS
measurements.
iv.
Low accuracy GPS use only the PRN signal; higher accuracy GPS use carrier phase
methods. Explain this statement.
Transcribed Image Text:Question 6. The Global Positioning System (GPS) is the most widely used GNSS. In point form, briefly answer the following questions: i. Why is it necessary for a GPS receiver to observe at least four satellites in order to reliably measure its location on Earth? ii. Approximately what accuracy (horizontal and vertical) would you expect to achieve with a single, low cost, handheld GPS receiver? Explain why differential GPS methods can be used to improve the accuracy of GPS measurements. iv. Low accuracy GPS use only the PRN signal; higher accuracy GPS use carrier phase methods. Explain this statement.
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