Figure 1-5.Pulse energy content

PULSE-REPETITION FREQUENCY AND POWER CALCULATIONS

Figure 1-6.Duty cycle

Neets Module 18-Radar Principles
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1-8 system. The figure is drawn just to show you how average power is calculated.) Pulse-repetition time is used to help figure average power because it defines the total time from the beginning of one pulse to the beginning of the next pulse. Average power is figured as follows: Figure 1-5.—Pulse energy content. Because 1/prt is equal to prf, the formula may be written as follows: The product of pulse width (pw) and pulse-repetition frequency (prf) in the above formula is called the DUTY CYCLE of a radar system. The duty cycle is a ratio of the time on to the time off of the transmitter, as shown in figure 1-6. The duty cycle is used to calculate both the peak power and average power of a radar system. The formula for duty cycle is shown below: NOTE: Pulse repetition frequency (prf) and pulse repetition rate (prr) are interchangeable terms.

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