To ensure different satellite geometry when conducting independent observations on the same day, the time difference between successive observations shall be at least how long?

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!

The main idea is to get independent observations by changing the satellite geometry. Satellites move along their orbits and the ground track changes as the Earth rotates, so waiting longer between measurements leads to a different set of visible satellites and a different geometry. If you take observations too close together, you’re likely to see the same satellites in similar configurations, which keeps the geometry almost the same and doesn’t provide truly independent data. Waiting about an hour gives enough time for a meaningful change in which satellites are visible and how they’re arranged in the sky, reducing correlation of errors and improving the reliability of the results.