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  The Micro-Doppler Effect in Radar
RF Cafe Quiz #42

All RF Cafe quizzes would make perfect fodder for employment interviews for technicians or engineers - particularly those who are fresh out of school or are relatively new to the work world. Come to think of it, they would make equally excellent study material for the same persons who are going to be interviewed for a job.

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Note: Many answers contain passages quoted in whole or in part from the text.



The Micro-Doppler Effect in Radar - RF Cafe Quiz #42This quiz is based on the information presented in "The Micro-Doppler Effect in Radar," by Victor C. Chen .




1.  What is the micro-Doppler effect?

a)  An oscillatory motion in addition to a bulk motion
b)  Micron-scale Doppler effects
c)  Large-scale nano-Doppler effects
d)  High resolution Doppler measurements



2.  Which of these is an image of Christian Doppler?

a)  The Micro-Doppler Effect in Radar, dude 1 - RF Cafe Quiz #42       b)  The Micro-Doppler Effect in Radar, dude 2 - RF Cafe Quiz #42       c)  The Micro-Doppler Effect in Radar, dude 3 - RF Cafe Quiz #42       d)  The Micro-Doppler Effect in Radar, dude 4 - RF Cafe Quiz #42



3.  What is an Euler angle?

a)  Angles of clockwise rotation about the x, y, and z axes.
b)  Angles of counterclockwise rotation about the x, y, and z axes.
c)  Angles of RF conduction
d)  Angles of dangles



4.  Which of the following are mechanisms for producing micro-Doppler shift?

a)  Vibration
b)  Rotation
c)  Coning motion
d)  All the above



5.  In the case of a rotating helicopter blade on a stationary aircraft, which Doppler frequency
     graph would be correct?

a)  The Micro-Doppler Effect in Radar, Helicopter Blade Signature 1 - RF Cafe Quiz #42           b)  The Micro-Doppler Effect in Radar Helicopter Blade Signature 2 - RF Cafe Quiz #42



c)  The Micro-Doppler Effect in Radar, Helicopter Blade Signature 3 - RF Cafe Quiz #42           d)  The Micro-Doppler Effect in Radar, Helicopter Blade Signature 4 - RF Cafe Quiz #42



6.  In figure "a" from question 5, why is a plateau over a range of Doppler frequencies formed
      in the blade signature rather than a single frequency?

a)  Helicopter blades are broadband components
b)  Blade speed varies along the span, increasing toward the tips
c)  Blade speed varies along the span, decreasing toward the tips
d)  Wobble along the span



7.  What is the Denavit-Hartenberg (D-H convention)?

a)  A quantum mechanics-based micro-Doppler model
b)  A way to describe static models as dynamic
c)  A mathematical translation of aircraft micro motion
d)  A kinematic representation of human body links and joints



8.  When analyzing articulated locomotion (animal
     walking, bird wing flapping, etc.), what is
     commonly assumed to describe the style of
     sinusoidal motion?

a)  Orthogonal equations
b)  Newtonian motion
c)  Harmonic oscillations
d)  Special relativity



9.  What is the difference between bipedal and
     quadrupedal locomotion?

a)  Two additional feet
b)  Two additional meters
c)  Two additional furlongs
d)  Two additional lightyears



10.  Which parameters can be extracted from micro-Doppler signatures of targets?

a)  Time and frequency
b)  Magnitude and phase of frequency shifts
c)  Position and direction
d)  All the above



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