Step 1: Concept Global Positioning Systems (GPS) calculate positions based on the exact known location of satellites in space. Several factors can introduce errors into this calculation.
Step 2: Meaning We must identify the specific error caused when the satellite itself deviates slightly from its predicted path in space.
Step 3: Analysis
• Atmospheric errors occur when the GPS signal slows down as it passes through the ionosphere and troposphere.
• Satellite geometry error (PDOP) relates to the relative position of satellites in the sky, not their individual location inaccuracies.
• Orbital errors (also known as ephemeris errors) occur when a satellite's actual position in orbit differs from the reported position broadcasted in its ephemeris data due to gravitational pulls.
Step 4: Conclusion Inaccuracies regarding where the satellite actually is in space are defined as orbital errors.
Final Answer: (B)
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