Q11.
Q12.
Q13.
Q14.
Q15.
Q16.
Q17.
Q18.
Q19.
Q20.
Q21.
Figure 2-14.—Pulse length versus range resolution.
REVIEW QUESTIONS
How does pulse length affect the amount of
energy returned from each pulse?
Pulse length is usually measured in what units?
What is described by the term "resolution"?
What is a radar’s ‘pulse repetition frequency"?
What happens when a radar’s PBF is increased?
What is meant by the term "range ambiguity"?
If a radar had a pulse repetition frequency
(PRF) of 1000, what would be its maximum
unambiguous range?
What causes the phenomena of range folding?
How does pulse volume affect radar power?
Which beamwidth would provide better target
resolution, a large beamwidth or a small
beamwidth?
What is the effect of beam broadening on radar
pulses?
Q22. How does the presence of sidelobes affect radar
performance?
Q23. What is the main cause of degraded azimuthal
resolution?
Q24. What is the main radar characteristic affecting
range resolution?
FACTORS AFFECTING RADAR
PROPAGATION
LEARNING OBJECTIVES: Define refraction
and refractive index. Recognize the effects of
refractivity on radar systems. Identify effects of
subrefraction, superrefraction, and ducting on
radar systems. Define and identify effects of
diffraction and ground clutter on radar systems.
Identify effects of scattering, absorption, and
solar activity on radar systems.
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