What is the primary purpose of GPS satellites for ground receivers?

What is the primary purpose of GPS satellites for ground receivers?

• A. Transmit emergency alerts
• B. Provide reference points for ground receivers
• C. Define spectrum licensing
• D. Encode voice transmissions

Answer: (B)

GPS satellites provide a precise reference framework for ground receivers. Each satellite broadcasts signals that carry its exact orbital position and precise time. A receiver on the ground uses the arrival times of signals from multiple satellites to determine its own position by solving for where it is in three dimensions and for its own clock error relative to GPS time. With signals from at least four satellites, the receiver can compute a accurate location and synchronize to a common time standard. The other options don’t describe GPS’s purpose: the system isn’t meant to transmit emergency alerts, define spectrum licensing, or encode voice transmissions.

GPS satellites provide a precise reference framework for ground receivers. Each satellite broadcasts signals that carry its exact orbital position and precise time. A receiver on the ground uses the arrival times of signals from multiple satellites to determine its own position by solving for where it is in three dimensions and for its own clock error relative to GPS time. With signals from at least four satellites, the receiver can compute a accurate location and synchronize to a common time standard. The other options don’t describe GPS’s purpose: the system isn’t meant to transmit emergency alerts, define spectrum licensing, or encode voice transmissions.