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AP3302 Pt3 Contents

AP3302 Pt3 Section 1 Contents

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AP 3302 Pt. 3

Section 1


Factors affecting the performance of Pulse-Modulated Radars

p.r.f. must be reduced. For a p.r.f. of 200 p.p.s. the peak power output is now 103/(200 x 5 x 10-6) = 1 MW. What we are really doing here is to adjust the pulse duty factor - the ratio of pulse duration to pulse spacing.

d. Improved definition. The more pulses that are transmitted per second the more pictures are 'painted' on the c.r.t. per second. This means a brighter and clearer display and improved definition. In addition the higher the p.r.f. the more echoes that are received from any one target per second. This means more reports per second on the change in range and direction of a moving target.

From what has been said it is clear that the p.r.f. selected for a particular radar must be a compromise between several conflicting requirements (Fig 18). Because of this, many radars have more than one value of p.r.f. for different ranges.



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