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Land Nav SME > GNSS > Flashcards

GNSS Flashcards

1
Q

What is the gps type made by Russia?

A

Glonass

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2
Q

What is the gps type made by China?

A

Beidou

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3
Q

What is the gps type made by EU?

A

Galileo (not in service)

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4
Q

What does GNSS stand for?

A

Global Navigation Satellite Systems

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5
Q

Explain space segment?

A 
24 satellites ( 7 reserves)
Configure in 6 orbital planes
12 hour orbit
20.2 km Alt
Onboard Atomic clocks

Survivability
Accuracy
Coverage

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6
Q

Explain control segment?

A

Master control station
10 monitoring stations
Monitoring satellites

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7
Q

What does NAVSTAR stand for?

A 
Navigation 
Satellite
Timing 
And
Ranging

Gps

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8
Q

What does multilateration mean?

A

Measurement of the difference in distance 2 or more known and unknown locations.

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9
Q

What does GPS work on?

A

Time and distance

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10
Q

What are the two satellite radio frequencies?

A

L1 and L2

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11
Q

Explain L1 radio frequency?

A

Coarse Acquisition code (CA)

Navigation message

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12
Q

Explain L2 radio frequency?

A 
Precise code ( P(Y) ) (Encrypted)
Navigation message
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13
Q

How long does a P(Y) code last for?

A

35 days

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14
Q

What does a Navigation message contain?

A

Ephermeris (Satellite location)

Almanac ( forecast of satellite location) bus timetable!

Sat clock corrections

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15
Q

GPS requires a minimum of how many fixes?

A

4

X, Y, Z and time

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16
Q

What are the main errors in GPS?

A

Receiver clock (time)

17
Q

What is the least accurate GPS fix?

A

Height

18
Q

Most GPS fixes can be corrected. Which one can not?

A

Trapasphere (environment)

19
Q

What can interfere with GPS reception?

A 
Weather
Electrical cables/ underground 
High powered radars
Large bodies of water
Iso containers
Barbwire fences
20
Q

What are the two GPS positioning services divided into?

A

Standard positioning Services (SPS)

Precise Positioning services
PPS

21
Q

What are GPS fixes accurate to?

A

SPS +- 30m

PPS +- 11.1m

22
Q

What does DAGR stand for?

A

Defence Advanced GPS Receiver

23
Q

What is the gps type made by USA?

A

Navstar

Land Nav SME (9 decks)

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