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8 Cards in this Set
- Front
- Back
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Theory of GNSS |
provides position determined by means of the receipt of radio signals from a satellite constellation in orbit around Earth. It’s a real-time, all weather, 24hr, worldwide, 3D positional system |
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List the 4 components of GPS |
Space segment, control segment, user segment, GNSS error |
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Space segment |
27 satellites orbiting Earth with 4-6 satellites on each plane. Provides at least 4 satellites within line of sight from anywhere on Earth |
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Control segment |
Tracks, monitors and predicts satellites positions |
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User segment |
Any person with a GPS receiver is the user segment |
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GNSS Signal |
Transmits data by microwave signals that are sent in 3 parts: - navigation msg: time, sv health - ephemeris data: precise orbit info - almanac: sv course orbit time/ ionosphere model |
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3 GNSS errors |
- satellite error: clock/ orbit error - atmospheric error: ionospheric/ tropospheric error - receiver error: clock/ station coordinate error |
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Satellites needed for GNSS fix and why |
4 satellites: X latitude Y longitude Z height T time based error x, y and z used to determine a position on Earth and T used to adjust for the error in the receivers clock |
