GNSS Flashcards
1
Q
What is the ICAO standard for aeronautical positions
A
WGS84
2
Q
Average height of GPS and inclination
A
20,000km 55 degree
3
Q
How many satellites in view at one time?
A
5-8 (atleast 5 degree above horizon)
4
Q
What are the 3 segments of GPS?
A
Space, Control, user
5
Q
satellites for 2D fix?
A
3
6
Q
satellites for 4D fix?
A
4
7
Q
satellites for 3D fix without RAIM?
A
4
8
Q
satellites for 3D fix with RAIM?
A
5
9
Q
satellites for 3D fix with RAIM and one extra?
A
6
10
Q
L1 Freq?
A
1575.42 MHz avail for commercial
11
Q
L3 Freq?
A
1381.05 MHz
12
Q
most accurate sataellite fix?
A
1 directly overhead and 3 spaced 120° apart close to the horizon
13
Q
What is EGNOS?
A
WAAS, by Europe
14
Q
Most significant GPS error
A
ionosphere propagation
15
Q
GPS how many satellites?
A
24
16
Q
Time to download GPS almanac?
A
12.5 minutes
17
Q
max lat for GPS
A
90 N/S
