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Question 1 of 206W73LwIW2jEsBhtrfcAV

How many satellites must be received to provide complete position and time?

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6W73LwIW2jEsBhtrfcAV

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How many satellites must be received to provide complete position and time?

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🔍 Key Concepts

• GPS position fixing uses range measurements from satellites • Each satellite gives you a distance from a known point in space (like a sphere around your position) • To get a full 3D position (latitude, longitude, and altitude) plus time, more satellites are needed than for a 2D fix

💭 Think About

• How many unknowns are you solving for when you want latitude, longitude, altitude, and receiver clock error? • If each satellite gives you one equation (one distance), how many satellites do you need to solve for that many unknowns? • What is the difference in satellite requirement between a 2D position (assuming you know altitude) and a full 3D position with precise time?

✅ Before You Answer

• Count the number of unknowns (lat, lon, altitude, receiver clock error) you are solving for • Match that to the number of independent measurements (one from each satellite) you need • Remember that accurate time in GPS is not free; it is solved as an extra unknown in the navigation solution

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Question 1 of 206W73LwIW2jEsBhtrfcAV

How many satellites must be received to provide complete position and time?

Back

Question 1 of 20

6W73LwIW2jEsBhtrfcAV

Q

How many satellites must be received to provide complete position and time?

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

• GPS position fixing uses range measurements from satellites • Each satellite gives you a distance from a known point in space (like a sphere around your position) • To get a full 3D position (latitude, longitude, and altitude) plus time, more satellites are needed than for a 2D fix

💭 Think About

• How many unknowns are you solving for when you want latitude, longitude, altitude, and receiver clock error? • If each satellite gives you one equation (one distance), how many satellites do you need to solve for that many unknowns? • What is the difference in satellite requirement between a 2D position (assuming you know altitude) and a full 3D position with precise time?

✅ Before You Answer

• Count the number of unknowns (lat, lon, altitude, receiver clock error) you are solving for • Match that to the number of independent measurements (one from each satellite) you need • Remember that accurate time in GPS is not free; it is solved as an extra unknown in the navigation solution

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed