Receiver Theory Test 2 Flashcards
Is Morse code an example of continuous wave?
False
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
True
A UAV/USV is considered a detectable threat and it utilises an uplink and downlink. True or false?
TRUE
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
False
Quantum radar utilises quantum mechanical effects, such as entanglement of photons or quantum efforts. True or false
True
What is the definition of modulation
Process of encoding sine waves for the purpose of deciphering information
A carrier wave of constant amplitude and phase is varied in frequency in accordance with the amplitude of the modulation wave
FMOP
A carrier wave of constant frequency and phase is varied in amplitude in accordance with the amplitude of the modulation wave
AMOP
A carrier wave of constant frequency and amplitude is varied in phase in accordance with the amplitude of the modulation wave
PMOP
Three uses of MTI - Moving target indicator
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
6 types of phased array
Sub
Array
Linear
Thinned
Conformal
Planar
Spherical
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 ?
Doppler Shift
Define pulsed Doppler
A pulsed radar extracts Doppler frequency shifts to detect moving targets and their velocity
Pulsed ~~~ radar is a technique where a pulsed radar extracts Doppler ~~~ ~~~ for the purpose of detecting moving targets and their ~~~
Doppler
Frequency
Shifts
Velocity
Uses of secondary surveillance radar
MAINE
Missile Guidance
ATC - Air traffic control
IFF
Navigation Systems
Earth Satellite vehicle beacons
PRF Range Doppler
Low
Medium
High
USA
Australia
Australia USA
U A
A A
A U
Advantages of low probability intercept radar
Increased range resolution
Low probability detection
Disadvantages of low probability of intercept radar
Reduced range
Define RCS
The amount of energy reflected by a target or equivalent area seen by radar
What is radar cross section influenced by
Target Size
Target Shape
Target Orientation
Construction materials
Expand LIDAR
Light detection and ranging
One advantage of LIDAR
More accurate and high resolution
Frequency deviation is a measure from the ~~~ frequency of an FSK signal to either the ~~~ or ~~~ limit
Centre
Mark
Space
Unmanned Aerial vehicles ( UAVs) or drones are sophisticated military assets which are used for
Surveillance
Reconnaissance
Intelligence
Target Acquisition
