Question

How many satellites are required for a 2D GPS, 3D GPS, RAIM, FDE?

A) 3 for 2D GPS
B) 4 for 3D GPS
C) 5 for RAIM
D) 6 for FDE

Answer 1

For different GPS functions, 3 satellites are required for 2D GPS, 4 satellites for 3D GPS, 5 satellites for RAIM, and 6 satellites are needed for FDE to ensure accurate and reliable positioning.

Step-by-step explanation:

The number of satellites required for different GPS functions varies, as each serves a unique purpose in determining position or enhancing accuracy and reliability:

• A) For 2D GPS positioning, which provides latitude and longitude coordinates, 3 satellites are generally required.
• B) To achieve 3D GPS positioning, which includes latitude, longitude, and altitude, 4 satellites are needed.
• C) RAIM (Receiver Autonomous Integrity Monitoring) is a technology used to ensure the reliability of GPS signals, and it typically requires at least 5 satellites to function correctly.
• D) FDE (Fault Detection and Exclusion), which allows for the identification and exclusion of faulty satellite signals, typically involves a minimum of 6 satellites.

These requirements are designed to ensure that GPS devices can provide accurate location data and maintain integrity, even when accounting for potential errors or signal issues.