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Receiver Theory > Receiver Theory Test 2 > Flashcards

Receiver Theory Test 2 Flashcards

1
Q

Is Morse code an example of continuous wave?

A

False

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2
Q

A continuous wave is a radio wave of constant amplitude, frequency and phase. The wave is not interrupted from its normal start and it’s termination. True or false

A

True

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3
Q

A UAV/USV is considered a detectable threat and it utilises an uplink and downlink. True or false?

A

TRUE

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4
Q

The process of beam forming is to produce good angular resolution/ sharpen is radiation pattern by combining energy forms singular emitter element, effectively forming a short linear array. True or false

A

False

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5
Q

Quantum radar utilises quantum mechanical effects, such as entanglement of photons or quantum efforts. True or false

A

True

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6
Q

What is the definition of modulation

A

Process of encoding sine waves for the purpose of deciphering information

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7
Q

A carrier wave of constant amplitude and phase is varied in frequency in accordance with the amplitude of the modulation wave

A

FMOP

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8
Q

A carrier wave of constant frequency and phase is varied in amplitude in accordance with the amplitude of the modulation wave

A

AMOP

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9
Q

A carrier wave of constant frequency and amplitude is varied in phase in accordance with the amplitude of the modulation wave

A

PMOP

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10
Q

Three uses of MTI - Moving target indicator

A

Eliminate clutter in situations such as busy airports

Detect low flying aircraft among ground clutter. Hills, building etc

Detect targets in a battlefield amongst hills and trees

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11
Q

6 types of phased array

A

Sub
Array
Linear
Thinned
Conformal
Planar
Spherical

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12
Q

A continuous wave radar is a continuous flow of radio energy that is transmitted, reflected by a moving target and then received in the form of a ?

A

Doppler Shift

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13
Q

Define pulsed Doppler

A

A pulsed radar extracts Doppler frequency shifts to detect moving targets and their velocity

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14
Q

Pulsed ~~~ radar is a technique where a pulsed radar extracts Doppler ~~~ ~~~ for the purpose of detecting moving targets and their ~~~

A

Doppler
Frequency
Shifts
Velocity

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15
Q

Uses of secondary surveillance radar

A

MAINE
Missile Guidance
ATC - Air traffic control
IFF
Navigation Systems
Earth Satellite vehicle beacons

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16
Q

PRF Range Doppler
Low
Medium
High

A

USA
Australia
Australia USA

U A
A A
A U

17
Q

Advantages of low probability intercept radar

A

Increased range resolution
Low probability detection

18
Q

Disadvantages of low probability of intercept radar

A

Reduced range

19
Q

Define RCS

A

The amount of energy reflected by a target or equivalent area seen by radar

20
Q

What is radar cross section influenced by

A

Target Size
Target Shape
Target Orientation
Construction materials

21
Q

Expand LIDAR

A

Light detection and ranging

22
Q

One advantage of LIDAR

A

More accurate and high resolution

23
Q

Frequency deviation is a measure from the ~~~ frequency of an FSK signal to either the ~~~ or ~~~ limit

A

Centre
Mark
Space

24
Q

Unmanned Aerial vehicles ( UAVs) or drones are sophisticated military assets which are used for

A

Surveillance
Reconnaissance
Intelligence
Target Acquisition

25
Q

A wave of constant amplitude and frequency and phase ( unkeyed area ). The wave is not interrupted form it’s normal start and it’s termination.

A

Continuous Wave

26
Q

A use of MTI for detecting low flying aircraft among ground clutter such as hills and building. True of false

27
Q

What MTI radar use a coherent oscillator and phase comparison techniques

A

Coherent MTI radar

28
Q

Which MTI radar use fixed targets and ground clutter returns to determine moving targets

A

Incoherent

29
Q

List 3 MTI radars

A

Air search
Low level targets
Civil airports

30
Q

5 Ionosphere conditions

A

SASSR
Sporadic E
Atmosphere Absorption
Solar flares
Sun spots
Rain echoes

31
Q

A radar which instead of relying on a reflected pulse, triggers a response from another radar carried on the target platform

32
Q

LPI

A

Low probability intercept

33
Q

RCS

A

Radar Cross section

34
Q

RCS is influenced by

A

Target Size
Target shape
Target orientation
Construction material

35
Q

Describe RCS

A

Equivalent areas seen by a radar

36
Q

TA
TT
OTHR
EW
SS

A

Target acquisition
Target tracking
Over the horizon radar
Early warning
Surface search

37
Q

NA
AM
MH
FC
CS

A

Navigation
Airborne Mapping
Missile Homing
Fire Control
Coastal search

38
Q

Military Frequency Band

A

A 0-250 MHZ H 6-8GHz
B 250-500 MHZ I 8-10GHz
C 0.5 - 1 GHZ J 10-20GHz
D 1-2 GHZ K 20-40 GHz
E 2-3 GHz
F 3-4 GHz
G 4-6GHz

Receiver Theory (1 decks)

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