# Monopulse Principles and TechniquesRF Cafe Quiz #44

All RF Cafe quizzes would make perfect fodder in 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.

Note: Some material based on books have quoted passages.

This 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?

a)  Synchronous lobe compression
b)  Simultaneous lobe compression
c)  Asynchronous lobe compression
d)  Random lobe compression

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

a)  A single pulse is used per target
b)  A single pulse provides complete range, Doppler, speed, and position data for the target
c)  A Single pulse is compressed to do the work of multiple pulses
d)  A single pulse provides information needed to obtain a pair of two-coordinate angle estimates

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

a)  It supports only "high" frequencies
b)  It provides high isolation, sum and difference outputs from two
independent inputs
c)  It combines the two input signals orthogonally
d)  It rotates the fields to E and H planes

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

a)  phase and amplitude comparison
b)  phase and angle comparison
c)  amplitude comparison and pulse compression ratio
d)  pulse compression ratio and phase comparison

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

a)  Phase steering
b)  Time-delay steering
c)  Frequency steering
d)  All of the above

6.  What is range rating?

a)  Blocking received signal from the receiver outside a specified time period
b)  Blocking received signal from the receiver inside a specified time period
c)  Blocking transmitted signal from the transmitter outside a specified time period
d)  Blocking transmitted signal from the transmitter inside a specified time period

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

a)  Transmitter spew
b)  Waveguide expansion/contraction
c)  Power supply variations
d)  Noise

8.  How does multipath affect monopulse performance?

a)  Operation is enhanced
b)  Operation is completely inhibited
c)  Target resolution and tracking is degraded
d)  Monopulse is immune to multipath error

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

a)  Self-protection jammers
b)  Cruise missiles
c)  Metallic chaffe
d)  Monopulse is immune to all forms of ECM

10.  What is squint angle?

a)  Closure angle of the antenna aperture
b)  Boresight angular error
c)  Distance of a focused beam from the primary antenna boresight
d)  The degree of eyelid closure need for operators to resolve tiny PPI targets