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1C5 5 Study > CDC Vol 1, 007 Basic Radar Principles > Flashcards

CDC Vol 1, 007 Basic Radar Principles Flashcards

1
Q
  • Define a radio wave.
A

A burst of energy that is transmitted by a radar sensor through the atmosphere or space.

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2
Q
  • What is the part of the radio wave that bounces back to the antenna?
A

An echo or return.

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3
Q
  • Identify the “brain” of the radar system. Why is that so?
A

The synchronizer, because it coordinates the operation of the various parts of the radar.

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4
Q
  • Explain the function of the modulator.
A

To provide an extremely large, very short square wave pulse of DC voltage to the transmitter.

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5
Q
  • What device allows a single antenna to both transmit and receive?
A

The duplexer.

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6
Q
  • What is the antenna’s purpose during transmission and reception?
A

Its function during transmission is to concentrate the radiated energy into a shaped beam that points in the desired direction into space. On reception, the antenna collects the energy contained in the echo signal and delivers it to the receiver.

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7
Q
  • What component of the radar separates wanted from unwanted signals?
A

The receiver

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8
Q
  • Define the terms “PRF” and “PRT” and explain why they are important.
A

The PRF is the number of times the radar transmits per second. The length of time between transmissions when the radar is not transmittingis the resting time. Transmission time, plus resting time (or the time from the beginning of one pulse to the next) we call the PRT. A lower PRF means a longer PRT. The longer the resting (listening) time of the radar, the more time there is for the transmitted pulse to go out, strike a target, and return. Thus, the lower the PRF, the greater is the range of the radar system.

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9
Q

The word radar is an acronym for?

A

Radio Detection and Ranging

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10
Q

What is the object that reflected the radio wave called?

A

Target

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11
Q

How is azmith and range of a target determined?

A
  • Azimuth is determined by the direction the antenna is facing.
  • Range is determined by the amount of time it takes the echo to return.
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12
Q

What is a radio wave or burst of energy also called?

A

Electromagnetic wave

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13
Q

Pulse Repetition Frequency (PRF) = ____

A

The number of times the radar transmits per second.

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14
Q

Pulse Repetition Time (PRT) = ____

A

Transmission time + rest time = PRT

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15
Q

What are the benefits and negatives of a low PRF?

A
  • Benefit: greater range

- Negative: more susceptible to interference

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16
Q

What are the basic radar components?

A
  1. Frequency Generator
  2. Modulator
  3. Transmitter
  4. Duplexer
  5. Antenna
  6. Receiver Protector
  7. Receiver
  8. Display
  9. Synchronizer
17
Q

Will a lower pulse repetition frequency (PRF) increase or decrease the range of a radar?

A

Increase

18
Q

What radar component coordinates the operation of the various parts of the radar and is the “brain” of a basic pulse radar?

A

Synchronizer

19
Q

What radar component provides an extremely large, very short, square-wave pulse of DC voltage to the transmitter?

A

Modulator

20
Q

What radar component delivers a series of high-energy burst RF energy and amplifiers to create the radar signal transmitted through the antenna?

A

Transmitter

21
Q

What radar component is required when the transmitter and receiver used the same antenna?

A

Duplexer

22
Q

What radar components primary purpose is to ensure a circuit failure does not cause RF energy transmitted by the radar to enter and overload the radar’s receivers?

A

Receiver Protectors

23
Q

What radar component concentrates the radiated energy into a shaped beam?

A

The Autenna

24
Q

What radar component has the purpose of the display is to visually present the information contained in the radar echo signal in a form suitable for your interpretation and action?

A

Display

25
Q

What radar component function is to detect desired echo signals in the presence of noise, interference, or clutter and must separate wanted from unwanted signals to a level where target information can be displayed?

A

Receiver

26
Q

What radar component has crystals that produce one of the several possible stable local oscillators?

A

Frequency Generator

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