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SEW 101 - Space Electromagnetic Warfare > Radar Fundamentals > Flashcards

Radar Fundamentals Flashcards

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1
Q

What does RADAR stand for?

A

Radio Detection and Ranging

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2
Q

Identify

  • Detects and tracks moving objects
  • Operate day or night
  • Operate in almost all weathers
  • Has very broad coverage
A

Radar

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3
Q

Identify

30 MHz - 2 GHz

Radar Frequency Ranges and Applications

A

Search Radars

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4
Q

Identify

1 GHz - 8 GHz

Radar Frequency Ranges and Applications

A

Search & Track Radars

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5
Q

Identify

4 GHz - 18 GHz

Radar Frequency Ranges and Applications

A

Fire Control & Imaging Radars

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6
Q

Identify

8 GHz - 100+ GHz

Radar Frequency Ranges and Applications

A

Missile Seekers

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7
Q

Identify

  • Transmitted Pulse
  • Propagation
  • Reflected Pulse “echo”
  • Echo is recorded and output to a display
A

Principles of Operation

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8
Q

Identify

Amount of the radar signal intercepted or redirected back toward the radar

A

RADAR Cross-Section (RCS)

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9
Q

Identify

Measures how effective the target is in reflecting the radar signal

A

Target (RCS)

  • Size
  • Shape
  • Orientation
  • Composition
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10
Q

What does TEARR stand for?

A
  • Time
  • Elevation
  • Azimuth
  • Range
  • Range-Rate
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11
Q

Identify

When a radar measurement is made and recorded

TEARR

A

Time

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12
Q

Identify

  • Vertical Direction determination
  • Measured from the horizontal plane

TEARR

A

Elevation

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13
Q

Describe Elevation and Azimuth Resolution

A

The farther the satellite, the better the resolution

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14
Q

Identify

  • Horizontal Direction determination
  • Measured from North

TEARR

A

Azimuth

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15
Q

Identify

The distance between the radar and the target

TEARR

A

Range

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16
Q

Identify

Combination of Total Power (Peak Power x Pulse Width) and Duty Cycle

TEARR

A

Radar Range

17
Q

True or False

A long pulse width picks up small details

TEARR

A

False

18
Q

True or False

A short pulse picks up finer details

TEARR

A

True

19
Q

A long pulse can have the same bandwidth (resolution) as a short pulse by what?

A

Modulating in frequency of phase

These techniques allows to achieve energy of a long pulse and the resolution of a short pulse

20
Q

The range resolution of radars is directly or inversely proportional to bandwidth?

A

Inversely

21
Q

Identify

  • How fast the target is moving towards or away from the radar
  • Doppler Processing uses the frequency shift in echoed pulse to determine approach velocity

TEARR

A

Range Rate

22
Q

Identify

  • Single narrow beam
  • Typically cued where to look
  • Typically tracks only one object at a time
  • Cheaper and easier to operate
  • May produce imagery

RADAR Type

A

Mechanical Radar

23
Q

Identify

  • Only able to track one object at a time
  • Difficulty with fast moving targets
  • Images require expert analysis
  • Susceptible to interference
  • Easier to Jam
  • Terrestrial Weather (High Winds/ Heavy Rain/Clutter)
  • Atmospheric Conditions

RADAR Types

A

Mechanical Radar Limitations

24
Q

Identify

  • Very Agile
  • High Antenna Gain
  • Allows for scanning or search functions
  • Uses beam steering and beam forming
  • Track multiple objects
  • Typically not used for imagery

RADAR Types

A

Phased Array Radar

25
Q

Identify

Components that work to redirect the energy in a phased array radar

A

Phase Shifters

26
Q

Identify

  • Field of View (FOV) is limited to 120° Azimuth (per face)
  • Expensive to build and operate
  • Often more complex than mechanical
  • UHF radars have lower resolutions
  • Terrestrial Weather and Clutter
  • Interference

RADAR Types

A

Phased Array Radar Limitations

27
Q

Identify

  • Used for imagery
  • SLAR configuration

RADAR Types

A

Synthetic Aperture Radars (SAR)

28
Q

Identify

Sources of Noise Received by RADAR

A

Radar Limitations

29
Q

Identify

  • Ionospheric Refraction
  • Ionospheric Attenuation
  • Ionospheric Dispersion
  • Faraday Rotation
A

Radar Environmental Considerations

30
Q

Identify

Bending closer the earth’s surface with distance away from the radar

A

Ducting

31
Q

Identify

  • Ground
  • Sea
  • Rain
  • Birds and Insects
A

Clutter

32
Q

Identify

  • Chaffs
  • Decoys
A

Countermeasures

SEW 101 - Space Electromagnetic Warfare (13 decks)

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