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Monopulse Principles and Techniques
Answers to RF Cafe Quiz #44
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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!

Click here for the complete list of RF Cafe Quizzes.

Note: Some material based on books have quoted passages.

Return to RF Cafe Quiz #44

Monopulse Principles and Techniques - RF Cafe Quiz 44This quiz is based on the information presented in Monopulse Principles and Techniques, by Samuel M. Sherman and David K. Barton.

 

 

 

1.  What is another common term for monopulse?

b)  Simultaneous lobe compression

Monopulse, also known as simultaneous lobe compression, is a method of determining the angular location of a source of radiation or of a "target" that radiates part of the energy incident upon it.  (see page xv)

 

 

2.  What is the main unique feature of the monopulse technique?

d)  A single pulse provides information needed to obtain a pair of two-coordinate angle estimates

[Monopulse] was coined because it clearly expressed the ability to collect from each pulse the information needed for a pair of two-coordinate angle estimates, whereas the older angle-sensing techniques of sequential lobing required several (at least four) pulses to form a pair of angle estimates.  (see page 20)

 

 

Magic-T hybrid junction - RF Cafe3.  What is the primary function of a Magic-T hybrid junction for radar purposes?

b)  It provides high isolation, sum and difference outputs from two independent inputs

...if inputs are applied simultaneously to ports 1 (d in image) and 2 (b in image). their sum will appear at one of the outputs and their difference at the other (a & c in image).  (see page 58)

 

 

 

4.  What are the two primary classes of monopulse techniques?

a)  phase and amplitude comparison

Distinguishing between phase- and amplitude-comparison monopulse  (see page 93)

 

 

 

5.  Which of these are methods commonly used for beam steering?

d)  All of the above

There are three principle methods of electronic steering.  (see page 127)

 

 

 

6.  What is range rating?

a)  Blocking received signal from the receiver outside a specified time period

To enable the monopulse processor to reject extraneous echoes and noise and to operate only on echoes received from the desired target, a range tracking loop keeps a range gate (time gate) centered on the desired target.  (see page 146)

 

 

 

7.  What is the main source of angular error in monopulse in low SNR conditions?

d)  Noise

Noise is the dominant source of angular error (or loss of track) under conditions of low signal-to-noise ratio, usually at long ranges.  (see page 226)

 

 

 

8.  How does multipath affect monopulse performance?

c)  Target resolution and tracking is degraded

Specular multipath causes erratic elevation tracking... Diffuse multipath effects are somewhat noise-like and can be treated only statistically.  (see page 271)

 

 

 

9.  Which common ECM technique has little effect on monopulse?

a)  Self-protection jammers

[Self-protection jammers] provide a strong, point-source signal that may actually improve monopulse tracking accuracy.  (see page 317)

 

 

 

10.  What is squint angle?

c)  Distance of a focused beam from the primary antenna boresight

See Figure 1.4  (page 8)

Quizzes from vintage electronics magazines such as Popular Electronics, Electronics-World, QST, Radio-Electronics, and Radio News were published over the years - some really simple and others not so simple. Robert P. Balin created most of the quizzes for Popular Electronics. This is a listing of all I have posted thus far.

RF Cafe Quizzes

Vintage Electronics Magazine Quizzes

Vintage Electronics Magazine Quizzes
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Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2026
Webmaster: Kirt Blattenberger
   BSEE - KB3UON - AMA92498
   USAF Radar Technician

About RF Cafe

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 tying up your telephone line, and a lady's voice announced "You've Got Mail" when a new message arrived...

Copyright  1996 - 2026

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