How many satellites are required for a fully operational GPS constellation?

How many satellites are required for a fully operational GPS constellation?

• A. 20 minimum
• B. 22 minimum
• C. 24 minimum
• D. 26 minimum

Answer: (C)

The correct answer is based on the operational requirements set forth for the Global Positioning System (GPS) constellation. A fully operational GPS system requires a minimum of 24 satellites to provide continuous global coverage for users. This figure allows for adequate redundancy to ensure that at least four satellites are in view from any location on Earth at any given time. Having 24 satellites deployed in six orbital planes, with each plane having four satellites, enables the system to maintain accurate positioning and timing services globally. This arrangement ensures that users can obtain a three-dimensional fix (latitude, longitude, and altitude) as well as precise time information, which is critical for various applications, including navigation and military operations. While options suggesting fewer satellites may suffice for limited coverage or specific applications, they do not meet the comprehensive operational needs required for global positioning. Thus, 24 satellites are essential to ensure that the GPS can function effectively under various conditions and across different geographic areas, providing dependable service worldwide.

The correct answer is based on the operational requirements set forth for the Global Positioning System (GPS) constellation. A fully operational GPS system requires a minimum of 24 satellites to provide continuous global coverage for users. This figure allows for adequate redundancy to ensure that at least four satellites are in view from any location on Earth at any given time.

Having 24 satellites deployed in six orbital planes, with each plane having four satellites, enables the system to maintain accurate positioning and timing services globally. This arrangement ensures that users can obtain a three-dimensional fix (latitude, longitude, and altitude) as well as precise time information, which is critical for various applications, including navigation and military operations.

While options suggesting fewer satellites may suffice for limited coverage or specific applications, they do not meet the comprehensive operational needs required for global positioning. Thus, 24 satellites are essential to ensure that the GPS can function effectively under various conditions and across different geographic areas, providing dependable service worldwide.