Question

The fraction of time that the transmitter is transmitting during one radar cycle is called

• A. Pulse Repeating Frequency
• B. Pulse Repetition Interval
• C. Pulses Per Second
• D. Duty Factor

Hint:

Radar Duty Factor: \[ DF=\frac{\text{Pulse Width}} {\text{PRI}} \] Average Power: \[ P_{avg}=DF\times P_{peak} \]

Answer 1

The Correct Option is D

Concept: Duty factor (or duty cycle) is defined as the fraction of time during which a radar transmitter is ON. Mathematically, \[ \text{Duty Factor} = \frac{\text{Pulse Width}} {\text{Pulse Repetition Interval}} \]

Step 1: Understand the meaning of duty factor.
During one radar cycle, the transmitter operates only for a small pulse duration. The ratio of transmitting time to total cycle time is called duty factor. \[ DF=\frac{\tau}{T} \] where \[ \tau=\text{pulse width} \] and \[ T=\text{pulse repetition interval} \]

Step 2: Compare with the options.
The definition exactly matches duty factor.

Step 3: Final Answer.
\[ \boxed{\text{Duty Factor}} \] Hence, \[ \boxed{\text{Correct Option (D)}} \]