Chapter 19+20 GPS

Question 0

Nævn de tre augmentation systems.

Answer 0

Air Based Augmentation System (ABAS)

Ground Based Augmentation System
(GBAS)

Satellite Based Augmentation System
(SBAS)

Question 1

Hvilke 4 fejlkilder findes der i forhold til GPS?

Answer 1

Ephemeris
- 2,5m

SV clock error
- 1,5m

Ionospheric propagation error
- 5m ved single freq. Ops.

Geometric dilution og propagation

Question 2

Hvad står FDE for og hvor mange SV kræves der?

Answer 2

Fault Detection and Exclusion

Minimum 6 SV

Question 3

Nævn de tre GPS segmenter

Answer 3

Space, control and user segment

Question 4

Hvad består Space segment (GPS) af?

Answer 4

• 24 SV’s
• 6 orbital planes
• Højde ca. 20.000km
• Omløbstid 12 h
• 5-8 SV in view altid

Question 5

Which sort of receivers are found in the User Segment (GPS)?

Answer 5

Sequential receivers (sportsure ol.)
Multiplex receivers (både og biler)
Multi-channel receivers (luftfart)

Question 6

What is included in each SV unique navigation message?

Answer 6

• SV position
• SV clock time
• SV clock error
• Information on ionispheric conditions
• Supplementary information (almanac, health)

Question 7

What is the ICAO standard for GPS position measurement?

Answer 7

WGS84

Question 8

Had betyder RAIM og hvad kræver dette?

Answer 8

• Receiver Autonomous Integrity Monotoring

- Kræver min. 5 SV