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Communication Systems

Q1:

Consider the following statements:
In a radar system having a high value of the ratio (antenna diameter)/wavelength
  1. the maximum range is large
  2. good target discrimination is achieved
  3. capture area is increased
  4. target acquisition is difficult
Which of the above are correct?

A 1, 2, 3, 4

B 1, 2, 3

C 1, 2

D 1, 3, 4

ANS:B - 1, 2, 3

As D/W increase, Gain G increases as G = k * pi^2 * (D/W) ^2 .

As G = 4 * pi/w^2 * area as G increses, effective area increases as Directive gain increases target discrimination is easier.



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