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ATPL - Radio Navigation > GNSS Constellation Comparison > Flashcards

GNSS Constellation Comparison Flashcards

To know the difference between NAVSTAR, GLONASS and GALILEO

1
Q

Number of satellites in Galileo?

A

30

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2
Q

Number of Satellites in GLONASS?

A

24

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3
Q

Number of satellites in NAVSTAR?

A

21 operational + 3 spare

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4
Q

Number of orbits and how many satellites in each orbit, NAVSTAR?

A

6 orbits - 4 satellites in each orbit

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5
Q

Number of orbits and how many satellites in each, GLONASS?

A

3 orbits - 8 satellites in each orbit

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6
Q

Number of orbits and how many satellites in each, Galileo?

A

3 orbits - 9 satellites and 1 spare in each orbit

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7
Q

Orbit inclination with equator in NAVSTAR?

A

55 degrees

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8
Q

Orbit inclination from equator in GLONASS?

A

64.8 degrees

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9
Q

Orbit inclination from equator in Galileo?

A

56 degrees

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10
Q

Height of GLONASS orbits?

A

19,100km

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11
Q

Height of NAVSTAR orbits?

A

20,200km

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12
Q

Height of Galileo orbits?

A

23,222km

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13
Q

Time for NAVSTAR orbit?

A

12hrs (11h58m)

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14
Q

Time for GLONASS orbit?

A

11h15m

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15
Q

Time for Galileo orbit?

A

14h

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16
Q

What’s the Earth reference used in GLONASS?

A

PZ-90

17
Q

What’s the Earth reference used in NAVSTAR?

A

WGS-84

18
Q

What’s the Earth reference used in Galileo

A

EGTS-89

19
Q

What time does Galileo work on?

A

GMT

20
Q

What time does GLONASS work on?

A

UTC/ZULU

21
Q

What time does NAVSTAR work on?

A

GPS time

22
Q

NAVSTAR Link frequencies?

A

L1 - 1575.42MHz

L2 - 1227.6MHz

23
Q

GLONASS link frequencies?

A

L1 - 1.6GHz

L2 - 1.2GHz

24
Q

Galileo Link frequencies?

A

1164-1215MHz
1260-1300MHz
1559-1591MHz (shared with GPS on a non-interference basis)

25
Q

How many atomic clocks in Galileo?

A

2 - One rubidium frequency standard clock and one passive hydrogen maser clock

26
Q

How many atomic clocks in NAVSTAR?

A

Three or Four

ATPL - Radio Navigation (2 decks)

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