GNSS

When does satellite geometry error reach its maximum?

• Asatellites are closest together
• Bsatellites are spaced well apart
• Csatellites are nearest the horizon.

What does DGPS refer to?

• Athe time difference between the transmission of the satellite's coded signal and the time that it is received at the aircraft
• Bthe time difference between the satellite and the aircraft GPS unit transmitting the same code point on the signal
• Cthe correction applied to the 'raw' GPS position to obtain a more precise position.

What prevents the satellites of GPS and GLONASS from colliding?

• Athe GPS orbit is at 55° to the equator while the GLONASS is at 60°
• Bthe GPS satellite orbits are 1200 km higher than the GLONASS orbits
• CGLONASS has only three orbital planes while GPS has six orbital planes.