FA 8 Flashcards
SUMMATIVE
A wave of ___ amplitude, frequency and phase which can be ___ in amplitude, frequency or phase to convey information.
Constant
Varied
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.
360
Two Polarised
Frequency
Military bands
Charlie
Delta
India
Bravo
Echo
Charlie 0.5 - 1 GHz
Delta 1-2 GHz
India 8-10 GHz
Bravo 250-500 MHz
Echo 2-3 GHz
___ ___ is the ratio between the ___ PD to the effective PD.
Pulse compression
Actual
Effective
The scan of a radar is the ___ of a beam of ___ in a ___ ___ in order to cover a region of space.
Directing
Energy
Set Pattern
A decibel is a ___ measure of the ratio between the output and the input of an electrical or acoustical circuit. Symbolised by __
Logarithmic
Ratio
dB
Power gain is any ___ in power when a signal is transmitted form one point to another, also expressed in decibels.
Increase
Decibels
Moving Target Indicator (MTI) Radars will only show returns from ___ targets.
Moving
IFF FREQUENCIES
Interrogator
Transponder
1030
1090
Calculate frequencies
SOL DIVIDED BY WL = FREQ
60m
50km
23cm
5MHz
6KHz
1.3GHz
Four categories of polarisation.
LERC
Linear
Elliptical
Rotating
Circular
Radar kilometre is equal to
6.66 usecs
MTUR is the ___ range radar can detect an object before range___occur.
Maximum
Ambiguities
Two characteristics the pulse duration determines in a radar.
Minimum range
Range resolution
5 types of signal fading.
PISSA
Polarisation
Interference
Skip
Selective
Absorption
CAD
Continuous Amplitude Digitisation
BAD
Burst Amplitude Digitisation
TBD
Time burst Digitisation
List 3 types digital recording media
PDW
PPDW
PDIF
What is RCS influenced by
Target Size
Target Shape
Target Orientation
Construction Materials
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 ___ .
Leading Edge
Trailing Edge
Microseconds
Two types of stagger interpulse modulations.
Simplex
Complex
What are the causes of unintentional jitter interpulse modulation.
Equipment failure in timing circuits
Fluctuations in power supplies.
Range resolution is the ability to discriminate between
grouped objects at different ranges but on the same bearing.
Advantages of intrapulse modulation
All the above
EP feature
Reduced peak power requirements
Increased range
Increased range resolution
The scan categories for radars are
Primary
Secondary
Combined
Passive
What is the basic principle of a receiver
The basic principle of a receiver is a Part of a radio system that extracts information from radio frequency energy intercepted by the antenna.
6 descriptive characteristics
PMMUST
Platform Type
Function
Modulation Type
User
Scan Type
TOI
2 advantages of LPI radar
LPI detection
Increased range
List three uses of moving target indicators radars
T OR F .
Reducing mutual interference and overcoming MTI blind speeds can be achieved by using a PRI stagger
TRUE
T OR F.
PFM is when the PRI’S increase and/or decrease in the same time period.
TRUE
If the percentage of jitter is less than 1 percent the jitter is assumed to be intentional
FALSE
T OR F.
The range resolution of a radar with a PD of 3.5 usecs is 525m
TRUE
Three types of Intrapulse modulation
PMOP
AMOP
FMOP
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.
TRUE
T OR F.
Time burst digitisation uses much less storage space than CAD and BAD
TRUE
A ___ is considered a detectable threat and it utilises an uplink and downlink.
UAV/UAS
T OR F.
Synthetic Aperture radar is strictly forward looking.
FALSE
