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Aircraft Systems > AS 15 - Intro to GPS > Flashcards

AS 15 - Intro to GPS Flashcards

1
Q

Review Questions

What are the RADALT basic components?

A

Receiver/ transmitter
Indicator
Antenna system

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2
Q

Review Questions

What Mode 3 codes are used for hijack, comms failure and emergencies?

A

7500
7600
7700

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3
Q

What is the basic principle of GPS?

A

Measures ranges between the receiver and satellites

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4
Q

When a receiver has the position of each satellite stored in its memory, what is this information referred to as?

A

Ephemeris data

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5
Q

What does a GPS provide?

A

Highly accurate 3D position

Velocity vector and time

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6
Q

Which type of service is a GPS?

A

Passive service (receiver)

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7
Q

Why is a GPS somewhat resistant to interference?

A

It uses a spread spectrum

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8
Q

What kind of coverage and number of users can a GPS accomodate?

A

Global coverage and unlimited users

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9
Q

What will the GPS Block lll provide in the future?

A

Distress Alerting Satellite System (DASS) for SAR

Satellite laser reflectors are used for tracking the orbits of the satellites independent of radio signals.

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10
Q

What will the Satellite laser reflectors for the GPS Block lll allow regarding errors?

A

It will allows satellite clock errors to be disentangled from ephemeris errors

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11
Q

The GPS consists of three distinct segments, what are they?

A

Space, control and user.

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12
Q

Regarding the Space Segment, the final constellation baseline will provide how many satellites for world wide coverage?

A

30

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13
Q

Regarding the Space Segment, how many orbital planes of 4-5 satellites are there?

A

6 orbital planes

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14
Q

Regarding the Space Segment, how many satellites are always in view?

A

6 to 11 satellites

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15
Q

Regarding the Space Segment, what is the orbit period and altitude of a satellite?

A

12 hours (approx) and 20 200 km.

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16
Q

Describe the satellite’s orbit.

A

It is semi-synchronous, meaning it orbits earth twice a day

17
Q

What does the Control Segment consist of?

A

5 monitor stations

1 master control station (MCS)

18
Q

What does MCS mean and what does it do?

A

Master Control Station

It collates satellite data from the monitoring systems on the satellite’s clock drift and orbital positions.
It uses this data to send corrections to the satellites if necessary and predict satellite behavior for the next few hours.

19
Q

What do the unmanned stations do?

A

They passively monitor the satellites in view and collect range and time data transfer.

20
Q

What does the User Segment consist of?

A

Antenna
Computer
Signal processing equipment
Oscillator (clock)

21
Q

Regarding GPS Policy, GPS provides which two navigation services?

A

Standard Position Service (SPS)

Precise Positioning Service (PPS)

22
Q

Regarding GPS Policy, SPS is used by who and utilizes which frequencies?

A

Civil and some military users
C/A on L1 frequency
Interim use of L2 frequency for carrier phase

23
Q

Regarding GPS Policy, SPS can expect what distance error?

A

7.8 m error

24
Q

Regarding GPS Policy, PPS is used by who and uses which frequencies?

A

Military

C/A on L1 and P/Y on L1 and L2

25
Q

Regarding GPS Policy, what is PPS’s accuracy?

A

< or equal to 5.9 m

26
Q

Regarding GPS Policy, PPS requires what for full access?

A

Decryption codes

27
Q

Regarding GPS Policy, DoD and DoT have committed through ICAO:

A

10+ years of GPS capability to civil aviation
7.8 m accuracy
6 year notification of any service reduction

28
Q

Regarding GPS Policy, when might civilians use PPS?

A

Critical national interest
Encryption keys can be adequately protected
If no alternative is available

29
Q

As GPS phases in, The DoD plans to phase out and retain what?

A

Phase out: NNSS, TACAN, OMEGA, LORAN and VOR/DME

Retain: INS

30
Q

Review Questions

The GPS consists of how many segments?

What are they?

A

Three

Space
Control
User

31
Q

Review Questions

The User segment consists of what?

A

Antenna
Signal processing equipment
Computer
Oscillator

Aircraft Systems (19 decks)

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