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Flashcards in Chapter 19+20 GPS Deck (9)
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0
Q

Nævn de tre augmentation systems.

A

Air Based Augmentation System (ABAS)

Ground Based Augmentation System
(GBAS)

Satellite Based Augmentation System
(SBAS)

1
Q

Hvilke 4 fejlkilder findes der i forhold til GPS?

A

Ephemeris
- 2,5m

SV clock error
- 1,5m

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

Geometric dilution og propagation

2
Q

Hvad står FDE for og hvor mange SV kræves der?

A

Fault Detection and Exclusion

Minimum 6 SV

3
Q

Nævn de tre GPS segmenter

A

Space, control and user segment

4
Q

Hvad består Space segment (GPS) af?

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

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

A
Sequential receivers (sportsure ol.)
Multiplex receivers (både og biler)
Multi-channel receivers (luftfart)
6
Q

What is included in each SV unique navigation message?

A
  • SV position
  • SV clock time
  • SV clock error
  • Information on ionispheric conditions
  • Supplementary information (almanac, health)
7
Q

What is the ICAO standard for GPS position measurement?

A

WGS84

8
Q

Had betyder RAIM og hvad kræver dette?

A
  • Receiver Autonomous Integrity Monotoring

- Kræver min. 5 SV