What is the purpose of time-domain gating in radar or pulsed radio?

• A. To change modulation scheme during operation
• B. To control when the system is listening or transmitting
• C. To adjust antenna orientation
• D. To increase transmitter power

Answer: (B)

Time-domain gating focuses on when the system listens or transmits. In pulsed radar, a pulse is sent and then the receiver is enabled only for a specific time window when echoes from targets at the expected ranges should return. This window, or gate, protects the receiver from the strong transmit pulse, reduces self‑interference, and helps pick up only useful echoes. The gate’s position determines the range you’re observing, and its width relates to range resolution. It’s not about changing how the signal is modulated, changing antenna orientation, or boosting transmitter power—those are separate functions.