EW300 Final Exam UPDATED
QUESTIONS AND CORRECT ANSWERS
Write the steps of the Detect to Engage sequence in order. - CORRECT ANSWER 1)Detect
*DeLoClassTrackSN*
2)Localize
3)Classify
4)Track
5)Selection
6)Neutralize
Pulse Width (PW) - CORRECT ANSWER the *active transmit time* or duration of the
electromagnetic pulse
Rest time (RT) - CORRECT ANSWER the *non-transmit time* or interval between
electromagnetic pulses
Pulse Repetition Time (PRT) - CORRECT ANSWER the total time for *one transmission
cycle*
Pulse Repetition Frequency (PRF) - CORRECT ANSWER number of *pulses transmitted per
second*
Peak Power (PPK) - CORRECT ANSWER the *maximum power* transmitted by a RADAR
Duty Cycle (DC) - CORRECT ANSWER the *ratio of transmit time to the total time*of one
transmission cycle
Range Resolution (RRES) - CORRECT ANSWER the *minimum range between two targets on
the same bearing* that the RADAR system is able to distinguish as two separate targets
,Cross Range Resolution (RCROSS) - CORRECT ANSWER the *minimum angular resolution*
between two targets of the same range which the RADAR system is able to distinguish as two targets
Which of the following changes would result in a decrease in maximum radar range (Rmax)? -
CORRECT ANSWER -Reduced *RADAR cross section* of target
-Widening *beamwidth* (azimuth or elevation)
How does a Track While Scan (TWS) system respond when a target fails to appear in an established
tracking gate ? - CORRECT ANSWER *Establish a turn gate* around the last known position
of the target.
Reflection - CORRECT ANSWER When an EM wave strikes a conductive surface and
*bounces off* it at an angle equal to the incident angle.
Diffraction - CORRECT ANSWER The tendency of EM waves to *spread out, or bend *around
objects.
Refraction - CORRECT ANSWER When an EM wave passes into a *medium with a different
SPEED of propagation*, and the EM wave bends towards/into the *medium of SLOWER* wave
propagation.
Interference - CORRECT ANSWER The property by which EM waves *superimpose and their
energies* combine when overlapping.
Basic Pulse RADAR - CORRECT ANSWER Detects bearing and range to target using a
*single antenna*
Basic Contiunuous Wave RADAR - CORRECT ANSWER Detects bearing and *relative
velocity* of target using *2 antennas*.
-Receiver
-*Two Antennas*
-*Mixer*
-Transmitter
, Pulse Doppler RADAR - CORRECT ANSWER Detects *bearing, range, and relative velocity;
ALL 3* of a target using a mixer and 1 antenna.
Frequency Modulated Continuous Wave RADAR (FMCW) - CORRECT
ANSWER Determines target bearing, relative velocity, and range with 2 anttenas *and
changing frequency* over a given time period.
Put the following "gates" in the order used by a track-while-scan radar during a normal tracking
sequence: - CORRECT ANSWER 1)*Acquisition* gate
2)Tracking gate
3)Turn gate -----*R before U*
Beamforming can be achieved by which two means? - CORRECT ANSWER 1)quasi-optical
reflectors
2)antenna array
Electromagnetic wave energy is attenuated due to - CORRECT ANSWER 1)Spreading
2)Scattering
3)Absorption
What type of interference occurs when overlapping EM waves have 0 degrees of phase difference
between them? - CORRECT ANSWER Constructive
The radar cross section of a target is dependent upon: - CORRECT ANSWER 1)Size
2)shape
3)construction *material *
4)*aspect angle* of the target.
Pulse Compression - CORRECT ANSWER is a *signal processing technique* in which the
receiver is able to resolve two or more targets with overlapping returns down the same bearing but
differ in range by varying the carrier frequency.
QUESTIONS AND CORRECT ANSWERS
Write the steps of the Detect to Engage sequence in order. - CORRECT ANSWER 1)Detect
*DeLoClassTrackSN*
2)Localize
3)Classify
4)Track
5)Selection
6)Neutralize
Pulse Width (PW) - CORRECT ANSWER the *active transmit time* or duration of the
electromagnetic pulse
Rest time (RT) - CORRECT ANSWER the *non-transmit time* or interval between
electromagnetic pulses
Pulse Repetition Time (PRT) - CORRECT ANSWER the total time for *one transmission
cycle*
Pulse Repetition Frequency (PRF) - CORRECT ANSWER number of *pulses transmitted per
second*
Peak Power (PPK) - CORRECT ANSWER the *maximum power* transmitted by a RADAR
Duty Cycle (DC) - CORRECT ANSWER the *ratio of transmit time to the total time*of one
transmission cycle
Range Resolution (RRES) - CORRECT ANSWER the *minimum range between two targets on
the same bearing* that the RADAR system is able to distinguish as two separate targets
,Cross Range Resolution (RCROSS) - CORRECT ANSWER the *minimum angular resolution*
between two targets of the same range which the RADAR system is able to distinguish as two targets
Which of the following changes would result in a decrease in maximum radar range (Rmax)? -
CORRECT ANSWER -Reduced *RADAR cross section* of target
-Widening *beamwidth* (azimuth or elevation)
How does a Track While Scan (TWS) system respond when a target fails to appear in an established
tracking gate ? - CORRECT ANSWER *Establish a turn gate* around the last known position
of the target.
Reflection - CORRECT ANSWER When an EM wave strikes a conductive surface and
*bounces off* it at an angle equal to the incident angle.
Diffraction - CORRECT ANSWER The tendency of EM waves to *spread out, or bend *around
objects.
Refraction - CORRECT ANSWER When an EM wave passes into a *medium with a different
SPEED of propagation*, and the EM wave bends towards/into the *medium of SLOWER* wave
propagation.
Interference - CORRECT ANSWER The property by which EM waves *superimpose and their
energies* combine when overlapping.
Basic Pulse RADAR - CORRECT ANSWER Detects bearing and range to target using a
*single antenna*
Basic Contiunuous Wave RADAR - CORRECT ANSWER Detects bearing and *relative
velocity* of target using *2 antennas*.
-Receiver
-*Two Antennas*
-*Mixer*
-Transmitter
, Pulse Doppler RADAR - CORRECT ANSWER Detects *bearing, range, and relative velocity;
ALL 3* of a target using a mixer and 1 antenna.
Frequency Modulated Continuous Wave RADAR (FMCW) - CORRECT
ANSWER Determines target bearing, relative velocity, and range with 2 anttenas *and
changing frequency* over a given time period.
Put the following "gates" in the order used by a track-while-scan radar during a normal tracking
sequence: - CORRECT ANSWER 1)*Acquisition* gate
2)Tracking gate
3)Turn gate -----*R before U*
Beamforming can be achieved by which two means? - CORRECT ANSWER 1)quasi-optical
reflectors
2)antenna array
Electromagnetic wave energy is attenuated due to - CORRECT ANSWER 1)Spreading
2)Scattering
3)Absorption
What type of interference occurs when overlapping EM waves have 0 degrees of phase difference
between them? - CORRECT ANSWER Constructive
The radar cross section of a target is dependent upon: - CORRECT ANSWER 1)Size
2)shape
3)construction *material *
4)*aspect angle* of the target.
Pulse Compression - CORRECT ANSWER is a *signal processing technique* in which the
receiver is able to resolve two or more targets with overlapping returns down the same bearing but
differ in range by varying the carrier frequency.
