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SFC > Satelite Principles > Flashcards

Satelite Principles Flashcards

0
Q

What is asynchronous orbit?

A

Satellite is going the other way than earths orbit

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1
Q

What do you use a asmith card for?

A

Bearing & elevation

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2
Q

What is a syncromes orbit?

A

Satellite stayes in the same place in the sky

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3
Q

What is the night of a geo orbit?

A

22223miles or 35,756km

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4
Q

What is the hight of leo orbit?

A

80 - 1200

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5
Q

What are military satellites orbit?

A

Geostationary syncrones orbit

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6
Q

Disadvantage and advantages of geostationary orbit?

A

Less drag / fewer satellites / provides constant coverage

Propagation loss / can’t provide polar coverage

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7
Q

What kind of orbit would you expect to find a GPS satellite in?

A

Asynchronous orbit

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8
Q

Name one disadvantage and one adavtage of LEO satellite?

A

Closer to earth - need less power, increasingly used for mobile comms, ideal for surveillance / photos.
Requires constellation of satellites for constant coverage, susceptible to drag

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9
Q

Explain what is meant by a broad beam footprint?

A

Wide down print from satellite

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10
Q

Explain spot beam?

A

Narrow down print from satellite

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11
Q

What is the approx frequency range of commercial satellite communication systems such as INMARSAT, IRIDIUM, THURAYA etc?

A

1525 to 1660 MHz ish L band

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12
Q

List the types of satellite communication / system we use in the group?

A

GPS, Thuraya, INMARSAT (GAN), INMARSAT (BGAN), iridium, military satcom, military tacsat

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13
Q

What is the approx frequency range of military strategic satellites communication systems such as UK/PSC501/3/4 & DAGGER/TALON etc?

A

7.25 to 8.4 Ghz

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14
Q

Which 2 generations of sky net satellites are used by UK military today?

A

Skynet 4 & 5

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15
Q

List the four INMARSAT GAN OCEAN REGIONS.

A

Pacific Ocean region
Atlantic Ocean region west
Atlantic Ocean region east
Indian Ocean region

16
Q

What freq does NAVSTAR GPS system operate?

A

1575.42 MHz

17
Q

What kind of orbit would you expect to find a IRIDUIM satellite?

A

Asynchronous

18
Q

How many LES(land earth stations) does the Inmarsat network have?

A

29

19
Q

What is the satellite downlink coverage area called?

A

Footprint

20
Q

What is the approx frequency range of military tactical satellite communication systems such as AN/PRC117F, 148 etc? (To the nearest 50 MHz)

A

240 - 320 MHz

21
Q

What are the six application for satellites? What are they used for?

A 
Meteorological 
Broadcast
Navigation
Scientific 
Phot surveillance 
Communication
22
Q

What is transmission delay?

A

The time is taken for a signal to trace between two SGS via a satellite

23
Q

What does SGS stand for?

A

Satellite ground station

24
Q

LES?

A

Land earth station

25
Q

Military satcom bearers?

A

Dagger talon
Vsat
Sweedish
SANTAM

SFC (14 decks)

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