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Radar > Radar Princ > Flashcards

Radar Princ Flashcards

1
Q

Differences between primary and secondary

A

Primary radar is 2 ways energy secondary is 1 way

Primary has no target coop secondary it two radars commin

Primary requires high tx power secondary has a low power tx

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2
Q

Target characteristics that effect radar performance

A

Type of material
Shape
Size
Distance

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3
Q

Describe clutter

A

Unwanted returns from anything other than a target

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4
Q

Target info provided by a pulsed primary radar

A

Slant range
Elevation
Azimuth

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5
Q

Receiver

A

Selects, amplifies and produces video pulses

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6
Q

T/R switch

A

Allows a single aerial for Tx and Rx

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7
Q

MTU

A

Controls the PRF

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8
Q

Modulator

A

Controls PW

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9
Q

RF oscillator

A

Controls the radio freq of the pulses

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10
Q

Aerial

A

Focuses and shapes the RF into a beam

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11
Q

Display

A

Displays the target echoes

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12
Q

What governs the choice of Freq

A

Size of target
Max detection range
Size of aerial
Beam width

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13
Q

What governs choice of PRF

A

Display definition
Aerial scanning speed
Transmitter mean power
Max range

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14
Q

What governs choice of pulse width

A

Receiver bandwidth
Transmitter mean power
Minimum range
Target discrimination

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15
Q

If the range increase by double how much does does peak power increase by

A

Increase by 16 time the og

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16
Q

If the range decrease by halve how much does peak power decrease by

A

1/16th of the power

17
Q

If power halves what is the % of range

A

84%

18
Q

What is second time around echoes and how is it corrected

A

An echo that has returned from beyond the selected range and appears in a display time of a pulse transmitted later

PRF jittering

19
Q

What target Info is provided by CW

A

Velocity

20
Q

Func of mixer in CW

A

Produced the Doppler freq

21
Q

Target info provided by FMCW

A

Range

22
Q

Func of freq modulator in FMCW

A

Changes the Tx freq scanning up and down linearly

Radar (5 decks)

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