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# The Micro-Doppler Effect in RadarRF Cafe Quiz #42

All 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!

Note: Some material based on books have quoted passages.

This 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)         b)         c)         d)

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)             b)

c)             d)

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?

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