Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Sat > Aaaa > Flashcards

Aaaa Flashcards

You may prefer our related Brainscape-certified flashcards:
SAT® Prep flashcards
1
Q

Define Satellite

A

A body that orbits another body in space

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Types of satellites

A

Natural e.g. moons, planets

Man-made e.g. LandSat, Hubble Telescope, Sputnik, Skynet

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Purpose of Sat Comms

A 
Observation
Navigation
Weather
Research
Communication
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

One of the Satellite purposes is Communication, what do Military use it for?

A

Global Comms
Small Footprints
Rapid Deployments
In-theatre Reachback

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Who envisioned the Wireless World and what date? What is it?

A

1945, Arthur C Clarke

3 Satellites 120° apart, Travelling West to East (or any direction), gives world-wide communication.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Which UK SkyNet satellite is still in operation?

A

SkyNet 4/5

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

5 Principles of Satellite Communication

A 
Satellite
Tx
Rx
Power
Line of Sight (LOS)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What are the 5 reasons for demand of SatComs?

A

MILSATCOM essential to UK’s strategic and tactical communications infrastructure.

Remove reliance on unreliable local comms facilities.

HQ comms over long distances.

Lower manpower requirements that relay tech.

Larger bandwidth available.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What frequency bands do we use for SATCOMs?

A

UHF | 300MHz - 3GHz

SHF | 3GHz - 30GHz

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What are the 3 Satellite Segments?

A

Space (the satellite)

Ground/Earth (any ground terminals, earth stations, mobile terminals and UKMSCS)

Control (integral to both space/ground/earth)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What are the 6 Sub-systems in Space?

A 
Antenna
Communication
Thrust (trajectory)
Stabilisation
Electrical Power Generation
Tracking Telemetry/Command
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What are the Ground Segments?

A

Fixed high capacity Operational Terminals

Master Control / Coordination Station

Duplicate alternative e.g. maintenance backup

Fixed/Semi-static for UK/Deployed

Mobile/transportable/man-pack tactical terminals

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What does Control Segment do?

A

Manage and control facilities to coordinate network

Control satellites / control ground comms terminals

Power balancing for usage and priority

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Where are the two main UKMSCS locations and which one is the main and backup?

A

Oakhanger (main)

Colerne (backup)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What hazards are involved in SatComs?

A

RF Hazard (EM radiation)
Deployment (weight etc.)
Electrical (High power area)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is the definition of Electromagnetic Radiation (EMR)?

How does it travel?

A

Waves of energy (electromagnetic field) as it propagates through any given medium.

Travels in straight lines (LOS).

17
Q

What band of frequencies do SatComs fall under in the electromagnetic spectrum?

A

Microwave band

18
Q

How does an antenna transmit waves to counter orientation/interference?

A

Circular polarization (helix shape)

19
Q

What are the advantages of SatComs?

A

Worldwide Comms
Quick Setup
Versatile (many functions)
Remote Locations

20
Q

What are the disadvantages of SatComs?

A

Cost
Lifespan (fuel)
Network of Satellites needed (for worldwide comms)
Time required (Planning, Deployment & Deployment)

21
Q

Types of Satellite Networks?

Examples of each?

A

Complex - more than one satellite e.g. GPS

Simple - 1 One satellite e.g. normal military setup

22
Q

What is the UpLink frequency?

A

7.9 - 8.4 GHz

23
Q

What is the DownLink frequency?

A

7.25 - 7.75 GHz

24
Q

What types of Orbits are there, and their sub orbits if any, brief description of each?

A

Polar - North-South poles (terrain mapping)

Sub-synchronous

  • Low earth orbits (LEO) (observations)
  • Medium earth orbits (MEO) (GPS)

Synchronous

  • Geostationary (Telecoms) (stays in same place)
  • Geosynchronous (Weather, Comms, Observations) (figure of 8)
25
Q

How long does a Synchronous Orbit take?

What altitude does a Synchronous satellite orbit at?

What bean width is required for 3 Satellites at 120° apart to encompass the whole of earth?

Does it require any tracking?

A

23hrs 56min 4s

35.7km or 22.3k miles

17°

Minimal/no tracking

26
Q

How do Geostationary and Geosynchronous orbits differ?

Tracking?

A

Geostationary orbits exactly above equator meaning stays in same place. No tracking.

Geosynchronous drifts near the equatorial place at an incline, creating figure 8 in sky. Minimal tracking.

27
Q

What are the 4 monitoring and control procedures of a satellite? Brief description?

A

Beacon (signal coming from satellite)

Locking on (Initial communication permission between ground and satellite using beacon to pinpoint location)

Tracking (keeping track of satellite with antenna e.g. figure 8 pattern)

Monitoring (bit errors, noise, power balancing)

28
Q

What ranges of Spot Beams are there and which do we use?

A

Global (large range)

Regional Wide (1800km radius)

Regional Narrow (1350km radius)

Theater (600km radius)

29
Q

What does a transponder usually consist of?

A

Receiving antenna
Band pass filter (BPF)
Low-Noise Amplifier (LNA)

Frequency Translator

High power Amplifier (HPA)
BPF
Transmitting antenna

30
Q

Explorer 700 BGAN Terminal speeds? Wi-fi range?

A

492 kbps

100m

31
Q

BGAN - health and safety requirements?

A

1m safety distance using cordons and signage

Only use approved batteries (Thrane & Thrane)

Observe marked heat areas

32
Q

What are the major subsystems/equipments in a Transmitting Station System? And what do they consist of/do?

A

Baseband
User -> Multiplexer -> Modem (digital to analogue) -> L-Band signal

Tx
Up Converter -> X-band -> Solid State Power Amplifier (SSPA) -> BPF

Antenna
Duplexor -> Waveguide -> Reflector

[Freq. Gen Equipment Subsystem -> stable clock -> Multiplexer/Modem]

33
Q

What are the major subsystems/equipments in a Receiving Station System? And what do they consist of/do?

A

Antenna
Reflector -> Waveguide -> Duplexor

Rx
BPF -> Low-noise Amplifier (LNA) -> Down Converter -> L-band

Baseband
Modem (analogue to digital) -> Multiplexer -> User

[Control and Monitoring - DConv -> BRX -> ACU -> Antenna]

34
Q

List the 7 major subsystems in a typical Satellite Earth Station not including the Users.

A 
Baseband
Transmitter
Receiver
FGES (Freq.Gen.Equipment.Subsystem)
Antenna
Power
Monitor & control
35
Q

What are the 4 antenna types? And how are they identified?

A

Cassegrain - Convex “(“ shape secondary reflector

Gregorian - Concave “)” shape secondary reflector

Axial/front-feed - parabolic primary reflector

Off-axis/Offset feed - irregular/offset support feed

Sat (1 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions