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IT Block 1 > Navy Satellite- Comms. > Flashcards

Navy Satellite- Comms. Flashcards

1
Q

What are 3 segments in Comms satellite system?

A
  1. ground
  2. space
  3. control
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2
Q

What is a comms satellite?

A

a specialized wireless receiver/transmitter that is launched in orbit around the Earth

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3
Q

What is a ground segment?

A

equipment on shore and ships used to transmit and receive message sent through SATCOM circuits

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4
Q

What is a space segment?

A

includes the actual satellite and its associated equipment in space.

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5
Q

What is control segment?

A

includes all administrative operations to manage satellites and ensure they are operational.
Also manages SAR and SAAs.

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6
Q

What are 2 satellite modes of operations?

A

active and passive

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7
Q

What is passive Operations?

A

reflects radio waves transmitted from one ground terminal to another without amplification. does not alter the signal

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8
Q

What is active?

A

changes received signal before transmitting signal back to the Earth

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9
Q

What are the orbits?

A

Synchronous and Asynchronous

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10
Q

What is a Asynchronous orbit?

A

satellite travels faster or slower than the speed at which the Earth rotates

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11
Q

What is Synchronous orbit?

A

satellite travels at the same speed that the Earth rotates

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12
Q

What are the types of orbits?

A

LEO, MEO, GEO, Molniya/HEO.

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13
Q

What is LEO?

A

Low Earth Orbit that is 400-1600 miles above Earth

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14
Q

What is MEO?

A

Medium Earth Orbit 1500-6500 miles above Earth

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15
Q

What is GEO?

A

Geosynchronous 22500 miles above the Earth

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16
Q

What is Molniya/HEO?

A

Highly Elliptical Orbit 24000 miles apogee and 900 mile perigee. is a asynchronous orbit.

17
Q

What are the type of SATCOM frequencies?

A

UHF, SHF, EHF.

18
Q

What is the characteristics of UHF?

A

300 MHz to 3 GHz, low capacity, high mobility, low anti-jam capability, vulnerable to nuclear radiation, widely use in the Navy on all types of ships, some aircraft and shore facilities

19
Q

What is the characteristics of SHF?

A

3 to 30Hz, high capacity, low mobility, moderate anti-jam capability, found in aircraft carriers, large amphibious ships, and on some cruisers, destroyers and shore stations

20
Q

What are some characteristics of SATCOM EHF?

A

30 to 300 GHz, high capacity, moderate mobility, high anti-jam capability, nuclear survivable, subject to wether conditions

IT Block 1 (14 decks)

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