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Cosford Radar > Basic Radar Principles > Flashcards

Basic Radar Principles Flashcards

1
Q

What are the basic radar modes?

A

Air to air search
Air to air tracking
Air to air while scan (TWS)
Ground Mapping

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2
Q

What modes make up air to air while scan?

A

Air to air search
Air to air tracking

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3
Q

Radar Functions

A

Target acquisition and tracking
Search and surveillance
Ground mapping
Weather warning
Proximity detection
Identification
Navigation

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4
Q

Types of transmission

A

Pulsed
Continuous wave (CW)
Frequency Modulated Continuous Wave (FMCW)

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5
Q

Information provided by Pulsed radar

A

Slant range, Angular position

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6
Q

Information provided by Continuous wave

A

Velocity
Relative Velocity

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7
Q

Information provided by by Frequency Modulated Continuous Wave

A

Slant Range

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8
Q

What is a radar kilometre?

A

Time taken for the energy to travel 1km and return back.

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9
Q

What is the value of 1 radar kilometre?

A

6.67us

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10
Q

Characteristics of a primary radar

A

Only one radar required
Doesn’t need co-operation of target
High TX power needed
Echoes received from all reflecting objects within range whether they are required or not

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11
Q

Primary radar operation

A

Transmits energy receives a portion of transmitted energy

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12
Q

Secondary radar operation

A

Transmits an interrogation signal

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13
Q

Secondary radar characteristics

A

Two radars
Long ranges obtainable
No echoes, no clutter

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14
Q

Meaning of pulsed repetition frequency

A

How many pulses per second

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15
Q

Role of the master timing unit

A

Controls the PRF, Affects range of radar

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16
Q

Role of Modulator

A

Controls pulse width- affects minimum range

17
Q

Role of RF Oscillator

A

Produces microwave frequency in timed pulses

18
Q

T/R Switch

A

Controls flow of pulses to and from aerial

19
Q

Role of Aerial/antenna

A

Directs/shapes and transmits signal

20
Q

Role of receiver

A

Amplifies and modulates the signal so that the display can use it.

21
Q

What is second time around echo

A

Target that is received in the next receive cycle

22
Q

Formula for mean power?

A

Peak-to-peak x PRF x Pulse Width

23
Q

Examples of a primary radar system

A

Aircraft attack radar
Ground mapping

24
Q

Examples of secondary radar systems

A

IFF, TACAN

25
Q

Target information that is determined by a PRIMARY RADAR

A

Azimuth and Elavation

26
Q

What target information can be determined by a continuous wave radar

A

Relative velocity

27
Q

What target information can be gathered by a FMCW radar

A

Slant range

28
Q

How do basic radar systems determine azimuth and elavation of a target

A

Angular position of aerial when echo is received

Cosford Radar (5 decks)

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