Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

ISR EW > Radar > Flashcards

Radar Flashcards

1
Q

What are the 4 principles of radar

A

Frequency
Pulse width (PW)
Pulse repetition frequency (PRF)
Arial rotation period (ARP)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What are the frequency bands for radar?

A

3-30Ghz

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is the wave length at 3GHz?

A

10cm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is the wavelength at 10GHz

A

3cm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What does the waveguide do?

A

Waveguides guide the signal to the reflector and minimize loss of signal, they must be matched to radar in use.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

How does the Wave guide size relate to wavelength?

A

2/3

If waveguide is 2, then wavelength is 3

4=6

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is the relationship between Arial size and frequency?

A

Higher frequency, smaller the Arial

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is the direct correlation between frequency and target discrimination?

A

Increase frequency = increased Target discrimination

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

How is range effected by frequency?

A

Increased frequency, lower range

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

How do you measure relative velocity?

A

Doppler effect
Manual plotting
Automatic plotting

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is the main disadvantage with continues range radars?

A

You need 2 Ariels, one to receive and one to transmit

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

How do you focus a radar beam?

A

Change the shape of the reflector

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

How is ARP relates to PRF?

A

Increased PRF decreases duration of the ARP

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

How does pulse width alter power and discrimination?

A

Increased pulse width increases power and decreases discrimination (hits and halves)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is the function of the master timing generator?

A

Produces timing pulses
Controls the Pulse repetition frequency
Controls the modulator (on/off)
Synchronizes…..

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What does the superheterodyne receiver do?

A

Changes the recieved frequency and converts to SHF which is more manageable

17
Q

What are the components of a pulse radar?

A 
Master timing generator
Modulator
Occilator
Transmit/receive switch ------ ariel 
 Amplifier
Superheterodyne receiver
Display
Time based generator
18
Q

What does an A scope display look like?

A

Gives an outline of the ship/item

19
Q

What does a B scope display look like?

A

Gives a relative bearing and range (topgun)

20
Q

What does a PPI display look like?

A

Lots of clutter, land etc, a lot more detailed picture

21
Q

How do you calculate wavelength or frequency?

A

C=F(lamda)

22
Q

How do you calculate maximum usable range?

A

MUR =0.5C/PRF

ISR EW (4 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions