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CPL Test Series
Question Bank
Questions for GNSS
Answer the following questions
Test Mode
Training Mode
1. EGNOS is
a LAAS
a system to remove errors caused by the difference between the model of the earth and the actual shape of the earth
a WAAS
the proposed European satellite navigation system
2. The navigation and system data message is transmitted through the
50 Hz modulation
The C/A code
The C/A and P PRN codes
The P code
3. The minimum number of satellites required for a 3D fix is
4
6
5
3
4. An all in view receiver
requires 5 satellites to produce a 4D fix
checks all the satellites in view and selects the 4 with the best geometry for fixing
informs the operator that all the satellites required for fixing and RAIM are in available
uses all the satellites in view for fixing
5. The initial range calculation at the receiver is known as a pseudo-range, because it is not yet corrected for
receiver and satellite clock errors and propagation errors
receiver clock errors
receiver and satellite clock errors
receiver and satellite clock errors and ephemeris errors
6. NAVSTAR/GPS operates in the band the receiver determines position by
UHF, range position lines
UHF, secondary radar principles
SHF, secondary radar principles
SHF, range position lines
7. A LAAS requires
an accurately surveyed site on the aerodrome and a link through the INMARSAT geostationary satellites to pass corrections to X, Y & Z co-ordinates to aircraft
an accurately surveyed site on the aerodrome and a link through the INMARSAT geostationary satellites to pass satellite range corrections to aircraft
an accurately surveyed site on the aerodrome and system known as a pseudolite to pass corrections to X, Y & Z co-ordinates to aircraft
an accurately surveyed site on the aerodrome and a system known as a pseudolite to pass satellite range corrections to aircraft
8. The model of the earth used for NAVSTAR/GPS is
WGS84
PZ84
PZ90
WGS90
9. The availability of two frequencies in GNSS
reduces propagation errors
reduces errors caused by GDOP
removes SV ephemeris and clock errors
removes receiver clock errors
10. The purpose of the pseudo-random noise codes in NAVSTAR/GPS is to
pass the navigation and system data
pass the ephemeris and time information
identify the satellites
pass the almanac data
11. The PRN codes are used to
pass ephemeris and clock data to the receivers
determine the range of the satellites from the receiver
determine the time interval between the satellite transmission and receipt of the signal at the receiver
synchronise the receiver clocks with the satellites clocks
12. The most significant error of GNSS is
Ephemeris
Ionospheric propagation
Receiver clock
GDOP
13. The frequency available to non-authorised users of NAVSTAR/GPS is
1575.42 MHz
1602 MHz
1246 MHz
1227.6 MHz
14. The use of LAAS and WAAS remove the errors caused by
GDOP, selective availability and propagation
elective availability, satellite ephemeris and clock
propagation, selective availability, satellite ephemeris and clock
receiver clock, GDOP, satellite ephemeris and clock
15. The orbital height and inclination of the NAVSTAR/GPS constellation are
19099 km, 55°
20180 km, 65°
19099 km, 65°
20180 km, 55°
16. The position derived from NAVSTAR/GPS satellites may be subject to the following errors
GDOP, static interference, instrument
selective availability, skywave interference, GDOP
ephemeris, GDOP, siting
propagation, selective availability, ephemeris
17. The NAVSTAR/GPS operational constellation comprises how many satellites
21
30
12
24
18. Which of the following statements concerning NAVSTAR/GPS time is correct?
satellite time is based on sidereal time
the satellite runs its own time based on seconds and weeks which is independent of UTC the satellite runs its own time based on seconds and weeks which is independent of UTC
the satellite runs its own time based on seconds and weeks which is correlated with UTC
satellite time is the same as UTC
19. The minimum number of satellites required for receiver autonomous integrity monitoring is
4
3
5
6
20. When using GNSS to carry out a non-precision approach the MDA will be determined using
Radio altimeter height
barometric altitude
GPS altitude
Either barometric or radio altimeter altitude
21. If a receiver has to download the almanac, the time to do this will be
25 minutes
12.5 minutes
15 minutes
2.5 minutes
22. The NAVSTAR/GPS reference system is
A geo-centred 3D Cartesian co-ordinate system fixed with reference to the sun
A geo-centred 3D Cartesian co-ordinate system fixed with reference to the prime meridian, equator and pole
A geo-centred 3D system based on latitude, longitude and altitude
A geo-centred 3D Cartesian co-ordinate system fixed with reference to space
23. The most accurate satellite fixing information will be obtained from
TRANSIT & NAVSTAR/GPS
COSPAS/SARSAT & GLONASS
NAVSTAR/GPS & COSPAS/SARSAT
NAVSTAR/GPS & GLONASS
24. The most accurate fixing information will be obtained from
one satellite directly overhead and 3 equally spaced at 60° above the horizon
one satellite close to the horizon and 3 equally at 60° above the horizon
four satellites spaced 90° apart at 30° above the visual horizon
one satellite directly overhead and 3 spaced 120° apart close to the horizon
25. The NAVSTAR/ GPS control segment comprises
the space segment, the user segment and the ground segment
a master control station, a back-up control station and five monitoring stations
a master control station, a back-up control station, five monitoring stations and the INMARSAT geostationary satellites
a ground segment and the INMARSAT geostationary satellites
26. If an aircraft manoeuvre puts a satellite being used for fixing into the wing shadow then
the accuracy will be unaffected
the receiver will maintain lock using signals reflected from other parts of the aircraft with a small degrading of positional accuracy
the receiver will automatically select another satellite with no degradation in positional accuracy
the accuracy will be temporarily downgraded
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