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JF_3 > GS GNSS/RNAV > Flashcards

GS GNSS/RNAV Flashcards

1
Q

How many satellites does the system have?

A

24

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2
Q

How many orbital planes are there?

A

6

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3
Q

How long does it take a satellite to orbit?

A

11 hours and 56 minutes

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4
Q

How many orbits can a satellite do per day?

A

2

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5
Q

How high do the satellites orbit?

A

20200km

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6
Q

How fast do satellites travel?

A

11340km/h

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7
Q

What is the Space Segment?

A

The satellites

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8
Q

What is the Control Segment?

A

5 monitoring stations around the world close to the equator.

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9
Q

Where is the master control station?

A

Colarado Springs

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10
Q

What is the User Segment?

A

Receivers.

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11
Q

What are the two navigation radio signals satellites send?

A

L1 and L2

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12
Q

What is the L1 signal?

A

1575.42MHz - Civilian Course Acquisition (C/A)

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13
Q

What is the L2 signal?

A

1227.6MHz - Precision Code (P Code) military use

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14
Q

How many satellites do we need for a 3D fix?

A

4

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15
Q

How many satellites do we need for RAIM?

A

5

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16
Q

How many satellites do we need for RAIM and FDE

A

6

17
Q

How many less satellites do we need if we have barometric aiding?

A

1 less

18
Q

What grid does the Navstar GPS use?

A

WGS84

19
Q

What is in the pseudorandom code?

A

Satellite Time, Ephemeris Data and Almanac Data

20
Q

What is Ephemeris Data?

A

A precise position and velocity of the satellite in orbit

21
Q

What is Almanac Data?

A

Information about where the satellite should be in its orbit and other satellites in their orbits for the next 4 hours.

22
Q

What is the effect of the ionosphere on the radio waves?

A

Slows them down.

23
Q

How much error can selective availability inflict?

A

100m

24
Q

How much error will a billionth of a second result in?

A

1 foot

25
Q

What is the 4th satellite used for?

A

Time and Position fixing

26
Q

Is a high GDOP good or bad?

A

Bad

27
Q

Are spread out satellites going to produce a high or low GDOP?

A

Low

28
Q

What is the HIL for enroute mode?

A

+-2nm

29
Q

What is the HIL for terminal mode?

A

+-1nm

30
Q

What is the HIL for approach mode?

A

+-0.3nm

31
Q

What is the CDI for enroute mode?

A

+-5nm

32
Q

What is the CDI for terminal mode?

A

+-1nm

33
Q

What is the CDI for approach mode?

A

+-0.3nm

JF_3 (7 decks)

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