A minimum of ___ satellites shall be observed

Prepare for the DMC Administrative Order Test No. 2007-29. Use flashcards, interactive quizzes, and detailed explanations for each question to enhance your understanding. Master the content with our comprehensive practice material and succeed!

Multiple Choice

A minimum of ___ satellites shall be observed

Positioning with GNSS requires solving for four unknowns: the user’s x, y, z coordinates and the receiver’s clock bias. Each satellite observation provides one equation relating these unknowns. With four satellites, you get four independent equations, yielding a unique solution for position plus the time error. If only three satellites are observed, there are only three equations for four unknowns, so a unique 3D fix cannot be obtained reliably. Two or one satellite would be even more insufficient. Hence, the minimum number that allows a complete, solvable fix is four.

Positioning with GNSS requires solving for four unknowns: the user’s x, y, z coordinates and the receiver’s clock bias. Each satellite observation provides one equation relating these unknowns. With four satellites, you get four independent equations, yielding a unique solution for position plus the time error. If only three satellites are observed, there are only three equations for four unknowns, so a unique 3D fix cannot be obtained reliably. Two or one satellite would be even more insufficient. Hence, the minimum number that allows a complete, solvable fix is four.

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