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Radar > Ew Radar > Flashcards

Ew Radar Flashcards

1
Q

One advantage of using FM over Am is a high resistance to natural interference.

True or false?

A

TRUE

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2
Q

For intrapulse modulation the ?? Is modulated in some way while the pulse is being ??

A

RF
Transmitted

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3
Q

The electric field is made to rotate ???
through space in either a left or right direction. This is achieved by transmitting ?? ?? waves of equal amplitude and ?? but 90 degrees out of phase at the same time. This results in the waves rotating in space. The wave rotates rapidly at one full rotation per cycle.

A

360 Degrees
Two Polarised
Frequency

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4
Q

The total number of pulses within each group

A

PPG

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5
Q

The interval between each consecutive pulse

A

PRI
Pulse Repetition Interval

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6
Q

?

A

PGRI

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7
Q

3 uses of intentional jitter

A
  1. Reduce adjacent radar interference
  2. EPM
  3. Reduce range / velocity ambiguities
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8
Q

Echo band frequency range

A

2000-3000 MHZ

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9
Q

Range resolution can be explained as the ability to discriminate between two targets that are the same ?? ?? ??

A

Bearing and range

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10
Q

Two components of an electromagnetic wave ?? ?? fields

A
  1. Magnetic
  2. Electric
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11
Q

What is the charge possessed by an electron?

A

Negative

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12
Q

Negative and positive ions are linked by a conductor required to create a controlled flow of electrons in a battery

True or false?

A

True

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13
Q

Secondary scans are defined as those where the scanning technique is done passively in order to extract movement or position information.

True or false?

A

False

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14
Q

The cause of intentional jitter are ?? ?? ?? ?? ?? and ?? ?? ?? ??

A

Equipment failure in timing circuits
Fluctuation in power supplies

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15
Q

A primary radar involves the use of a radar beacon in the target which is passive until triggered by an interrogating radar.

True or false?

A

False

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16
Q

Learn Frequency table

A

Frequency table

17
Q

The scan of a radar is the ?? of a beam of ?? in a ?? in order to cover a region of space

A

Directing

Energy

Jet pattern

18
Q

India band frequency range

A

8000-10000 MHZ

19
Q

Foxtrot band is frequency range

A

3000-4000 MHZ

20
Q

During daylight hours the layers present in the ionosphere are

A

D, E, F1, F2

21
Q

Calculate the wavelengths from the following frequencies ( to a whole number)
10Mhz = ?? ?
2 KHz = ?? ??
30 Mhz = ?? ??

A

10Mhz = 30 m

2khz = 12 km

30 Mhz = 10 m

22
Q

PISSA

A
  1. Polarisation
  2. Interference
  3. Selective
  4. Skip
  5. Absorption
23
Q

PRI sliding is pulse interval modulation (PIM) where the PRI’s ?? ?? ?? ?? ?? ?? ?? ?? ?? and then
Repeat but not within the same ?? ??

A

Increase or decrease between an upper and lower limit

Time period

24
Q

The range resolution of a radar with a PD of 3.5 usecs is 525m

A

True

25
Q

The random PRI variations for discrete /individual elements or values

A

Discrete

26
Q

The random PRI variations do not form discrete individual elements or values

A

Continuous

27
Q

Total number of different PRI’s in a fixed sequence

A

Elements

28
Q

Total number of
PRI’s in a fixed sequence

A

Positions

29
Q

The order in which the PRI’s in a fixed sequence are transmitted 400/600/550

A

Firing Order

30
Q

Total take to for all PRI’s - staggered pulse train

A

Cyclic Length

31
Q

Number of times that the staggered sequence is repeated in 1 second

A

Cyclic Rate

32
Q

3 main types of radars that use Dwell and Switch

A
  1. Airborne
  2. Intercept
  3. Fire Control
  4. Target tracking
33
Q

Electrical signals or radio waves are transmitted from an aerial in the form of electric and magnetic fields oscillating at right angles to each other. The ?? Of a radio wave is said to be in the plane of electric field

A

Polarisation

34
Q

A radar is intercepted with the following parameters and sequence
PRI’s : 1200, 3200, 1600, 4400 usecs
RF : 8750 MHz
Determine cyclic length usec
FO

A

Cyclic length = 12000 usec
FO = 1, 2, 3, 2, 4

35
Q

A wave of ?? amplitude frequency and phase which can be ?? In amplitude, frequency l or phase to convey information

A

Constant

Varied

36
Q

Juliet band frequency range

A

10-20 GHz = 10000-20000 MHz

37
Q

Charlie band frequency range

A

500-1000 MHz

Radar (1 decks)

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