Subelement A: RADAR Principles – 10 Key Topics – 10 Exam Questions – 8 Drawings— Topic 4: Power, Pulse Width, PRR
Question 8-4A2
Element 8 (RADAR)A shipboard RADAR transmitter has a pulse repetition frequency (PRF) of 1,000 Hz, a pulse width of 0.5 microseconds, peak power of 150 KW, and a minimum range of 75 meters. Its duty cycle is:
Explanation
The duty cycle of a pulsed radar transmitter represents the fraction of time the transmitter is actively emitting a pulse compared to the total cycle time. It is a fundamental parameter in radar theory, indicating the transmitter's "on" time.
The duty cycle is calculated by multiplying the pulse width (TW) by the pulse repetition frequency (PRF):
Duty Cycle = Pulse Width (TW) × Pulse Repetition Frequency (PRF)
Given values:
Pulse Width (TW) = 0.5 microseconds = 0.5 × 10$^{-6}$ seconds
Pulse Repetition Frequency (PRF) = 1,000 Hz
Substitute these values into the formula:
Duty Cycle = (0.5 × 10$^{-6}$ s) × (1,000 Hz)
Duty Cycle = 0.5 × 10$^{-6}$ × 10$^{3}$
Duty Cycle = 0.5 × 10$^{-3}$
Duty Cycle = 0.0005
The peak power and minimum range are additional radar parameters but are not required for calculating the duty cycle. Therefore, the calculated duty cycle is 0.0005.
Related Questions
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