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FA 8 RECEIVER THEORY > FA 8 > Flashcards

FA 8 Flashcards

SUMMATIVE

1
Q

A wave of ___ amplitude, frequency and phase which can be ___ in amplitude, frequency or phase to convey information.

A

Constant
Varied

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2
Q

The electric field is made to ___ degrees 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 revolution per cycle.

A

360
Two Polarised
Frequency

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3
Q

Military bands
Charlie
Delta
India
Bravo
Echo

A

Charlie 0.5 - 1 GHz
Delta 1-2 GHz
India 8-10 GHz
Bravo 250-500 MHz
Echo 2-3 GHz

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4
Q

___ ___ is the ratio between the ___ PD to the effective PD.

A

Pulse compression
Actual
Effective

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5
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
Set Pattern

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6
Q

A decibel is a ___ measure of the ratio between the output and the input of an electrical or acoustical circuit. Symbolised by __

A

Logarithmic
Ratio
dB

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7
Q

Power gain is any ___ in power when a signal is transmitted form one point to another, also expressed in decibels.

A

Increase
Decibels

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8
Q

Moving Target Indicator (MTI) Radars will only show returns from ___ targets.

A

Moving

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9
Q

IFF FREQUENCIES
Interrogator
Transponder

A

1030
1090

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10
Q

Calculate frequencies
SOL DIVIDED BY WL = FREQ
60m
50km
23cm

A

5MHz
6KHz
1.3GHz

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11
Q

Four categories of polarisation.

A

LERC
Linear
Elliptical
Rotating
Circular

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12
Q

Radar kilometre is equal to

A

6.66 usecs

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13
Q

MTUR is the ___ range radar can detect an object before range___occur.

A

Maximum
Ambiguities

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14
Q

Two characteristics the pulse duration determines in a radar.

A

Minimum range
Range resolution

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15
Q

5 types of signal fading.

A

PISSA
Polarisation
Interference
Skip
Selective
Absorption

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16
Q

CAD

A

Continuous Amplitude Digitisation

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17
Q

BAD

A

Burst Amplitude Digitisation

18
Q

TBD

A

Time burst Digitisation

19
Q

List 3 types digital recording media

A

PDW
PPDW
PDIF

20
Q

What is RCS influenced by

A

Target Size
Target Shape
Target Orientation
Construction Materials

21
Q

Pulse repetition interval is the time period between the ___ of one pulse to the ___ of the next successive pulse within the pulse train. PRI is measured in ___ .

A

Leading Edge
Trailing Edge
Microseconds

22
Q

Two types of stagger interpulse modulations.

A

Simplex
Complex

23
Q

What are the causes of unintentional jitter interpulse modulation.

A

Equipment failure in timing circuits
Fluctuations in power supplies.

24
Q

Range resolution is the ability to discriminate between

A

grouped objects at different ranges but on the same bearing.

25
Q

Advantages of intrapulse modulation

A

All the above
EP feature
Reduced peak power requirements
Increased range
Increased range resolution

26
Q

The scan categories for radars are

A

Primary
Secondary
Combined
Passive

27
Q

What is the basic principle of a receiver

A

The basic principle of a receiver is a Part of a radio system that extracts information from radio frequency energy intercepted by the antenna.

28
Q

6 descriptive characteristics

A

PMMUST
Platform Type
Function
Modulation Type
User
Scan Type
TOI

29
Q

2 advantages of LPI radar

A

LPI detection
Increased range

29
Q

List three uses of moving target indicators radars

A
29
Q

T OR F .
Reducing mutual interference and overcoming MTI blind speeds can be achieved by using a PRI stagger

A

TRUE

30
Q

T OR F.
PFM is when the PRI’S increase and/or decrease in the same time period.

A

TRUE

31
Q

If the percentage of jitter is less than 1 percent the jitter is assumed to be intentional

A

FALSE

32
Q

T OR F.
The range resolution of a radar with a PD of 3.5 usecs is 525m

A

TRUE

33
Q

Three types of Intrapulse modulation

A

PMOP
AMOP
FMOP

34
Q

T OR F.
The basic principle of a receiver is a Part of a radio system that extracts information from radio frequency energy intercepted by the antenna.

A

TRUE

35
Q

T OR F.
Time burst digitisation uses much less storage space than CAD and BAD

A

TRUE

36
Q

A ___ is considered a detectable threat and it utilises an uplink and downlink.

A

UAV/UAS

37
Q

T OR F.
Synthetic Aperture radar is strictly forward looking.

A

FALSE

38
Q
A

FA 8 RECEIVER THEORY (1 decks)

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