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SEW 101 - Space Electromagnetic Warfare > PC1: Modulation > Flashcards

PC1: Modulation Flashcards

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1
Q

What are the RF Signal classifications?

A
  • Analog Signals (Continuous)
  • Digital Signals (Discrete)
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2
Q

Modulation is the process of what?

A

Superimposing a low frequency signal onto a higher frequency signal

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3
Q

Fourier Transfer is used to what?

A

Convert a signal between the frequency and time domains

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4
Q

What is Pulse Code Modulation (PCM) used for?

A

Convert analog signals to digital signals

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5
Q

What are the 3 steps to Pulse Code Modulation (PCM)?

A
  1. Sampling - reading filtered signals at discrete time intervals
  2. Quantizing - assigning values
  3. Encoding - changing to binary
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6
Q

Define:

Constellation Diagrams

A

A graphical representation of digital modulation techniques

Ex. Phase Shift Keying (PSK) and Quadrature Amplitude Modulation (QAM)

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7
Q

What are the Modulations?

A
  • Amplitude Modulation (AM)
  • Frequency Modulation (FM)
  • Phase Modulation (PM)
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8
Q

What does Amplitude Modulation (AM) do?

A

Modulate amplitude

It is the oldest and easiest form of modulation - ex. talk radios

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9
Q

What does Frequency Modulation (FM) do?

A

Modulate frequency

Popular because it doesn’t require complex hardware. Think of all the radio stations we have.

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10
Q

What is Digital Modulation also known as?

A

Shift Keying

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11
Q

What are the Digital Modulations?

A
  • Amplitude Shift Keying (ASK)
  • Frequency Shift Keying (FSK)
  • Phase Shift Keying (PSK)
  • Quadrature Amplitude Modulation (QAM)
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12
Q

What is Quadrature Amplitude Modulation (QAM) a combination of?

A

Amplitude and phase modulation

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13
Q

What is the digital equivalent of PM?

A

Phase Shift Keying (PSK)

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14
Q

What is the digital equivalent of FM?

A

Frequency Shift Keying (FSK)

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15
Q

What is the digital equivalent of AM?

A

Amplitude Shift Keying (ASK)

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16
Q

What is the base of binary code?

A

Two

This means that binary information can have only two states 0 and 1

17
Q

Digital Signals are represented by what kind of waves?

A

Square waves

18
Q

Analog Signals are represented by what kind of wave?

A

A sine wave

19
Q

How do analog signals transmit data?

A

In the form of a wave

20
Q

How do digital signals carry data?

A

In the form of bits

SEW 101 - Space Electromagnetic Warfare (13 decks)

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