What is the minimum number of satellites...

Question 1 / 27070eTfkYWXNxcDRGYbwBOks

Question 1 of 27070eTfkYWXNxcDRGYbwBOks

What is the minimum number of satellites that must be received to provide the highest accuracy?

Back

Question 1 of 27070

Q

What is the minimum number of satellites that must be received to provide the highest accuracy?

🔍 Key Concepts

• GPS satellite geometry (3D positioning) • Difference between 2D fix (latitude/longitude) and 3D fix (lat/long + altitude) • How many unknowns your GPS receiver must solve for, including receiver clock error

💭 Think About

• Think about how many variables the GPS receiver must solve for: latitude, longitude, altitude, and clock error. How many satellites are needed to solve four unknowns? • Consider the minimum number of satellites needed for a basic position fix versus the number needed for the most accurate 3D fix with good reliability. • Ask yourself: with only two or three satellites, what dimensions of your position can you NOT fully determine?

✅ Before You Answer

• Recall that 3 satellites are associated with a basic position fix, but ask what type of fix that actually is. • Verify how receiver clock error adds an extra unknown that must be solved for using additional satellite data. • Remember that more satellites can improve accuracy, but the question asks for the minimum needed for highest accuracy 3D positioning.

Question 1 of 27070

Q

What is the minimum number of satellites that must be received to provide the highest accuracy?

A

Four

B

Two

C

Eight

D

Six

Question 1 / 27070eTfkYWXNxcDRGYbwBOks

Question 1 of 27070eTfkYWXNxcDRGYbwBOks

What is the minimum number of satellites that must be received to provide the highest accuracy?

Back

Question 1 of 27070

Q

What is the minimum number of satellites that must be received to provide the highest accuracy?

🔍 Key Concepts

• GPS satellite geometry (3D positioning) • Difference between 2D fix (latitude/longitude) and 3D fix (lat/long + altitude) • How many unknowns your GPS receiver must solve for, including receiver clock error

💭 Think About

• Think about how many variables the GPS receiver must solve for: latitude, longitude, altitude, and clock error. How many satellites are needed to solve four unknowns? • Consider the minimum number of satellites needed for a basic position fix versus the number needed for the most accurate 3D fix with good reliability. • Ask yourself: with only two or three satellites, what dimensions of your position can you NOT fully determine?

✅ Before You Answer

• Recall that 3 satellites are associated with a basic position fix, but ask what type of fix that actually is. • Verify how receiver clock error adds an extra unknown that must be solved for using additional satellite data. • Remember that more satellites can improve accuracy, but the question asks for the minimum needed for highest accuracy 3D positioning.