GNSS: DGCA Air Navigation questions

Question 1

Position fixing by satellite is by means of:

Accepted Answer

simultaneous ranges from a number of satellites.

Answer

simultaneous bearings from a number of satellites

Answer

range and bearing from each known satellite's position

Question 2

The DGPS is:

Accepted Answer

the correction applied to the 'raw' GPS position to obtain a more precise position.

Answer

the time difference between the transmission of the satellite's coded signal and the time that it is received at the aircraft

Answer

the time difference between the satellite and the aircraft GPS unit transmitting the same code point on the signal

Question 3

The reason that the satellites of GPS and GLONASS do not collide is:

Accepted Answer

the GPS satellite orbits are 1200 km higher than the GLONASS orbits

Answer

the GPS orbit is at 55° to the equator while the GLONASS is at 60°

Answer

GLONASS has only three orbital planes while GPS has six orbital planes.

Question 4

The GPS can:

Accepted Answer

provide two-dimension and three-dimension positions

Answer

only provide position in latitude and longitude

Answer

indicate two-dimension positions or position lines in the horizontal plane.

Question 5

The GPS transmission frequency which can be used by civil aircraft is:

Accepted Answer

1575.42 MHz in the L-band

Answer

2227.5 MHz in the S-band

Answer

1227.6 MHz in the L-band.

10 more questions in this chapter