Progress 3 Flashcards
NAVSTAR/GPS operates in the UHF band, the receiver determines position by ___ ____ lines
range position lines
The NAVSTAR/GPS control segment comprises: a master control station, a back-up control station and 3/4/5 monitoring stations.
5
The use of LAAS and WAAS remove the errors caused by: selective availability, satellite ___ and clock
ephemeris
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
surveyed
The position derived from NAVSTAR/GPS satellites may be subject to the following errors:
pro___
selective ___
ephemeris
propagation, selective availability
EGNOS is a W___
WAAS (Wide Area Augmentation System)
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
a) determine the time interval between the satellite transmission and receipt of the signal at the receiver
The availability of two frequencies in GNSS: reduces ___ errors
propagation
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
b) the prime meridian, equator and pole
The navigation and system data message is transmitted through the: __ Hz modulation
50
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 ___
UTC
A precision RNAV system is required to be accurate to:+/- _ nm
1
In a simple 2D RNAV system navigation is effected using: VOR/__
DME
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
a) the presentation the pilot sees is the same as if the aircraft was homing to a VOR/DME
Augmentation systems (LAAS & WAAS) remove the errors caused by:
a) propagation, SV ephemeris and clock
b) SV ephemeris and clock
b) SV ephemeris and clock
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
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
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
d. Propagation errors
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
b. satellite clock error, ionospheric propagation information, almanac
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
d) determine the satellite range errors which are then transmitted through the navigation channels of the INMARSAT geostationary satellites to receivers
A WAAS, for example EGNOS, provides the receivers with:
b. SV range corrections through a pseudolite
d. SV range corrections through satellite link
d. SV range corrections through satellite link
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
b. 1 nm at 1000 nm
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
d. differential range by pulse technique
LORAN C chains provide coverage:
a. in specified areas
c. only in the northern hemisphere
d. globally
a. in specified areas
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
witin coverage
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
a. it has not yet been corrected for receiver clock error
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
b. one SV directly overhead and 3 equally spaced at about 30° above the horizon
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
c. determining the X, Y & Z errors and transmitting this via the INMARSAT geostationary satellite system
The minimum number of satellites required to achieve RAIM is:
a. 5
b. 6
c. 4
a. 5
The inclination and altitude of NAVSTAR / GPS is:
a. 55° and 10,898 nm
c. 55° and 10,313 nm
a. 55° and 10,898 nm
A precision RNAV system is required to be accurate to:
a. +/-5 nm
b. +/-1°
c. +/-5°
d. +/-1 nm
d. +/-1 nm
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
d. show zero deviation from the localiser
