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why do we authenticate > sta > Flashcards

sta Flashcards

stsa

1
Q

purposes

A

observation navigation weather research communication

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1
Q

sat definiation

A

a satilite is a body that orbits around another body in space

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2
Q

who

A

Arthur C Clarke and he did the blue prints to say that u should use 3 satilites all at 120 degree angles to have full coverage of the earth at all times

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3
Q

principles

A

satelite reciever line of site power transmitter

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4
Q

frequency bands

A

ultra high frequency – 300Mhz - 3 Ghz
super high frequency – 3 ghz to 30 ghz

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5
Q

subsystems

A

thrust
stabilisation
electronic power generation
tracking telementry
communications
antenna

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6
Q

hazards

A

RF hazards
deployment
electrical

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7
Q

advantages

A

worldwide communications
quick to set up
versatile
remote locations

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8
Q

disadvantages

A

cost
lifespan of fuel
networks of satellites needed
planning development and deployment time of satelites

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9
Q

name a complex sat network

A

complex - gps

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10
Q

simple network

A

2 stations 1 satalite

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11
Q

how long does synchronous take to orbit the earth

A

23 56 4

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12
Q

geo sync

A

8

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13
Q

geo stationary

A

coincides with the equator

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14
Q

what are the 3 orbits

A

polar sub sychronous and synchronous

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15
Q

monitoring and control

A

beacon
locking on
tracking
monitoring

16
Q
A
17
Q

satellite transponders

A

receive antenna - bpf - lna - freq trans - hpa - bpf - transmit anytenna

18
Q

reviewing station is made up of

A

antenna RX and base and and control and monitoring

19
Q

transmitting station

A

antenna baseband tx and frequency standard

20
Q

Health and safety concerns

A

keep away from atenna front
only use approved batteries
observe marked areas

21
Q

baseband

A

multiplexer and modem

22
Q

antenna types

A

axial or front feed
off axis
cassegrain
gregorian

why do we authenticate (2 decks)

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