Vayudoot Aviation

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

2227.5 MHz in the S-band.

1227.6.5MHz in the L-band.

1575.42 MHz in the L-band.

2. The GPS can

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

provide two-dimension and three-dimension positions

only provide position in latitude and longitude

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

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

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

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

4. The model of the earth used for NAVSTAR/GPS is

WGS84

PZ90

WGS90

5. NAVSTAR/GPS operates in the _______ band and the receiver determines position by ________

UHF, range position line

UHF, secondary radar principles

SHF, secondary radar principles

6. It may be claimed that GNSS has the advantage over other air navigation systems in that it

is entirely space-based.

has no possible input by the pilot

is basically a military-based system made available to civil users with solar-powered satellites which have an infinite life.

7. Position fixing by satellite is by means of

simultaneous ranges from a number of satellites.

range and bearing from each known satellite's position

simultaneous bearings from a number of satellites

8. Satellite geometry error is greatest when

satellites are closest together

satellites are nearest the horizon.

satellites are spaced well apart

9. The minimum number of satellites required for a 3D fix is

5

3

4

10. The accuracy of range measurement of satellite to GPS receiver is

seriously eroded during periods of anomalous propagation in an inversion

seriously reduced during periods of sunspot activity

derived from accurate timepieces in the satellite and the aircraft's GPS receiver.

11. The US DoD degrades GPS accuracy

to protect the DoD copyright

to protect US national security

to prevent 100% reliance on a system which may have to be interrupted for military purposes at a moment's notice.

12. The NAVSTAR/GPS operational constellation comprises ___________ satellites

24

12

21

13. The DGPS is

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

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

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

14. The orbital height and inclination of the NAVSTAR/GPS constellation are

19099 km, 65°

20180 km, 55°

20180 km, 65°

15. Satellites used in GNSS< orbit the earth

once in eight hours

once in 24 hours.

once in twelve hours

Question Bank

Questions for RK BALI GNSS