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Navigation Aids > GNSS > Flashcards

GNSS Flashcards

1
Q

What are the 4 system a GNSS includes

A
  1. One or more satellite
  2. Aircraft recievers
  3. System integrity monitoring
  4. Augmentation
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2
Q

What type of modeling does GPS use

A

WGS-84

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3
Q

What type of signal does a GNSS satellite produce

A

Broadcast

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4
Q

What frequency signal does GNSS transmit

A

UHF. 1.2-1.6 GHz

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5
Q

What are the 2 levels of service GPS offers

A
  1. Standard

2. Precise positioning

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6
Q

Who uses Precise positioning and is it encrypted

A

US Military & approved foregin powers

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7
Q

What are the 3 elements/ segments of GPS system

A
  1. Space
  2. Control
  3. User
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8
Q

How often do space segment satellites orbit the earth?

A

Approx 12hrs

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9
Q

What are the 2 main components associated with the user segment

A

Portable, hand held receivers

Recievers permanently installed in aircraft

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10
Q

What is the required accuracy for a particular nav route called and what is the actual GPS accuracy called?

A

Required Nav Performance

Actual Nav Performance

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11
Q

What are the 7 GPS limitations and errors

A
  1. Ephemeris Error
  2. Ionoshpheric error
  3. Tropospheric propagation error
  4. Multipath error
  5. Clock error
  6. Receiver noise
  7. Sattelite availability
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12
Q

An aircraft does not contain an atomic clock, how does it compute position for each sattelite?

A

Pseudo-range (time measurement from each sattelite)

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13
Q

What does Ground based augmentation system (GBAS) do?

A

Uses a VHF link to aircraft to transmit:

  • locally relevant corrections
  • integrity data
  • approach data
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14
Q

What does Aircraft based augmentation system (ABAS) do

A

Uses onboard equipment to overcome the performance limitations of GNSS

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15
Q

What are the 2 ABAS currently in use

A
  1. Reciever auto integrity monitoring

2. Aircraft auto integrity monitor

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16
Q

What does RAIM do

A

Determine if a sattelite is providing corrupt info

17
Q

What does AAIM do

A

Uses position from aircrafts INS and other sensors as an integrity check of GNSS, when RAIM is unavailable

18
Q

What can further GPS accuracy?

A

By using differential stations

19
Q

Is UHF virtually unnaffected by weather?

A

Yes

20
Q

How mang GLSSU does the pc21 have?

A

2

21
Q

Briefly explain the types of GNSS limitations and errors

A
  1. Ephemeris: Error inherent to satellite position data
  2. Ionospheric: apparent change of speed of light in ionosphere
  3. Tropospheric propagation effect: water vapour in troposphere delays satellite signal
  4. Multipath: signal bounces off multiple signals before getting to reciever
  5. Clock: sattelite atomic clock becomes out of alignment with reference clock
  6. Reciever noise: unwanted disturbances superimposed on signal obscuring signals usefulness or content

Navigation Aids (4 decks)

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