Question

What is the minimum number of satellites needed for a GPS receiver to determine its position precisely?

• A. 1
• B. 2
• C. 4
• D. 6

Hint:

Remember: \[ \boxed{ \begin{aligned} 3\ \text{Satellites} &\rightarrow \text{Approximate position} 4\ \text{Satellites} &\rightarrow \text{Accurate 3D position} \end{aligned} } \]

Answer 1

The Correct Option is C

Concept: A GPS receiver requires signals from at least four satellites to determine its three-dimensional position and correct the receiver clock error.

Step 1: Understand GPS positioning. The four satellites provide information for
• Latitude
• Longitude
• Altitude
• Receiver clock correction

Step 2: Determine the minimum requirement. Thus, \[ \boxed{\text{A minimum of four satellites is required for precise positioning}.} \] Therefore, the correct option is \[ \boxed{(C).} \]