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    Kirt Blattenberger,


RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while typing up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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

RF Engineering Quizzes - RF CafeAll RF Cafe Quizzes make great 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. Bonne chance, Viel Glück, がんばろう, buena suerte, удачи, in bocca al lupo, 행운을 빕니다, ádh mór, בהצלחה, lykke til, 祝你好運. Well, you know what I mean: Good luck!

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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

Need some help? Click here for the answers and explanations.

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