Progress 3

Question 1

NAVSTAR/GPS operates in the UHF band, the receiver determines position by ___ ____ lines

Answer 1

range position lines

Question 2

The NAVSTAR/GPS control segment comprises: a master control station, a back-up control station and 3/4/5 monitoring stations.

Answer 2

5

Question 3

The use of LAAS and WAAS remove the errors caused by: selective availability, satellite ___ and clock

Answer 3

ephemeris

Question 4

A LAAS requires: an accurately ___ site on the aerodrome and system known as a pseudolite to pass corrections to X, Y & Z coordinates to aircraft

Answer 4

surveyed

Question 5

The position derived from NAVSTAR/GPS satellites may be subject to the following errors:
pro___
selective ___
ephemeris

Answer 5

propagation, selective availability

Question 6

EGNOS is a W___

Answer 6

WAAS (Wide Area Augmentation System)

Question 7

The PRN codes are used to:

a) determine the time interval between the satellite transmission and receipt of the signal at the receiver
b) determine the range of the satellites from the receiver

Answer 7

a) determine the time interval between the satellite transmission and receipt of the signal at the receiver

Question 8

The availability of two frequencies in GNSS: reduces ___ errors

Answer 8

propagation

Question 9

The NAVSTAR/GPS reference system is: A geo-centred 3D Cartesian coordinate system fixed with reference to

a) fixed point in space
b) the prime meridian, equator and pole

Answer 9

b) the prime meridian, equator and pole

Question 10

The navigation and system data message is transmitted through the: __ Hz modulation

Answer 10

50

Question 11

Which of the following statements concerning NAVSTAR/GPS time is correct? The satellite runs its own time based on seconds and weeks which is correlated with ___

Answer 11

UTC

Question 12

A precision RNAV system is required to be accurate to:+/- _ nm

Answer 12

1

Question 13

In a simple 2D RNAV system navigation is effected using: VOR/__

Answer 13

DME

Question 14

In simple 2D RNAV equipment, the waypoint is known as a phantom station because:

a) the presentation the pilot sees is the same as if the aircraft was homing to a VOR/DME
b) the equipment transposes the VOR/DME designating the station to the waypoint

Answer 14

a) the presentation the pilot sees is the same as if the aircraft was homing to a VOR/DME

Question 15

Augmentation systems (LAAS & WAAS) remove the errors caused by:

a) propagation, SV ephemeris and clock
b) SV ephemeris and clock

Answer 15

b) SV ephemeris and clock

Question 16

A local area augmentation system (LAAS) uses a pseudolite which:

b. gives aircraft on approach X, Y and Z corrections, and accurate range information using secondary radar techniques
c. gives aircraft on approach X, Y, and Z corrections formatted to trick the receiver into thinking there is a satellite at the runway threshold

Answer 16

c. gives aircraft on approach X, Y, and Z corrections formatted to trick the receiver into thinking there is a satellite at the runway threshold

Question 17

The most significant error in fixing in satellite navigation systems is caused by:

a. SV clock error
b. Receiver clock error
c. GDOP
d. Propagation errors

Answer 17

d. Propagation errors

Question 18

The contents of the NAVSTAR GPS navigation and system message include:

a. clock time, almanac, satellite position corrections
b. satellite clock error, ionospheric propagation information, almanac

Answer 18

b. satellite clock error, ionospheric propagation information, almanac

Question 19

EGNOS is part of a global WAAS. The ground stations:

d) determine the satellite range errors which are then transmitted through the navigation channels of the INMARSAT geostationary satellites to receivers
c. determine the satellite range errors which are then transmitted through a pseudolite to receivers

Answer 19

d) determine the satellite range errors which are then transmitted through the navigation channels of the INMARSAT geostationary satellites to receivers

Question 20

A WAAS, for example EGNOS, provides the receivers with:

b. SV range corrections through a pseudolite
d. SV range corrections through satellite link

Answer 20

d. SV range corrections through satellite link

Question 21

The accuracy of a LORAN C groundwave fix is:

a. 20 nm at 1000 nm
b. 1 nm at 1000 nm
c. 20 nm at 2500 nm

Answer 21

b. 1 nm at 1000 nm

Question 22

The principle of operation of LORAN C is:

b. differential range by secondary radar
c. range by pulse technique
d. differential range by pulse technique

Answer 22

d. differential range by pulse technique

Question 23

LORAN C chains provide coverage:

a. in specified areas
c. only in the northern hemisphere
d. globally

Answer 23

a. in specified areas

Question 24

According to ICAO (Annex 11), the definition of an RNAV system is: one which enables the aircraft to navigate on any desired flight path [within the coverage / not within coeverage] of appropriate ground based navigation aids or within the specified limits of self-contained on-board systems or a combination of the two

Answer 24

witin coverage

Question 25

The initial calculation of range from an SV by the receiver is known as a pseudo-range, because:

a. it has not yet been corrected for receiver clock error
b. it has not yet been corrected for SV clock error
c. it has not yet been corrected for SV ephemeris errors
d. all of the above

Answer 25

a. it has not yet been corrected for receiver clock error

Question 26

The best satellite geometry for the most accurate fixing is:

a. one SV directly overhead and 3 equally spaced at 60° above the horizon Incorrect
b. one SV directly overhead and 3 equally spaced at about 30° above the horizon

Answer 26

b. one SV directly overhead and 3 equally spaced at about 30° above the horizon

Question 27

EGNOS provides position enhancement by:

b. determining the SV range errors and transmitting this via the INMARSAT geostationary satellite system
c. determining the X, Y & Z errors and transmitting this via the INMARSAT geostationary satellite system

Answer 27

c. determining the X, Y & Z errors and transmitting this via the INMARSAT geostationary satellite system

Question 28

The minimum number of satellites required to achieve RAIM is:

a. 5
b. 6
c. 4

Answer 28

a. 5

Question 29

The inclination and altitude of NAVSTAR / GPS is:

a. 55° and 10,898 nm
c. 55° and 10,313 nm

Answer 29

a. 55° and 10,898 nm

Question 30

A precision RNAV system is required to be accurate to:

a. +/-5 nm
b. +/-1°
c. +/-5°
d. +/-1 nm

Answer 30

d. +/-1 nm

Question 31

An aircraft carrying out an ILS approach is on the runway centreline (QDM 253°). If the heading feed to the EHSI suddenly gets a 5° east deviation, the ILS presentation will:

c. show full scale fly right Incorrect
d. show zero deviation from the localiser

Answer 31

d. show zero deviation from the localiser