In pulsed radar, the range gate chiefly defines what?

In pulsed radar, the range gate chiefly defines what?

• A. Maximum unambiguous range
• B. Pulse repetition frequency control
• C. Transmitter duty cycle
• D. Receiver sensitivity

Answer: (A)

In pulsed radar, the range gate is the specific time window after each transmitted pulse during which the receiver is allowed to listen for echoes. This window maps directly to a particular distance being examined, because range is derived from the two-way travel time of the pulse (range = c × time / 2). The farthest range you can unambiguously determine is set by the time between pulses, i.e., the pulse repetition interval. If an echo returns later than the next pulse is transmitted, it can become mixed with echoes from subsequent pulses, causing ambiguity about which pulse it came from. Therefore, the range gate effectively defines the maximum unambiguous range because it fixes how long you wait to receive echoes within each PRI before the next pulse starts. The width of the gate influences how finely you can resolve range within that window, but the primary thing the gate establishes is the unambiguous range limit. The other aspects—PRF control, transmitter duty cycle, and receiver sensitivity—are governed by separate design choices and aren’t defined by the gate itself.

In pulsed radar, the range gate is the specific time window after each transmitted pulse during which the receiver is allowed to listen for echoes. This window maps directly to a particular distance being examined, because range is derived from the two-way travel time of the pulse (range = c × time / 2).

The farthest range you can unambiguously determine is set by the time between pulses, i.e., the pulse repetition interval. If an echo returns later than the next pulse is transmitted, it can become mixed with echoes from subsequent pulses, causing ambiguity about which pulse it came from. Therefore, the range gate effectively defines the maximum unambiguous range because it fixes how long you wait to receive echoes within each PRI before the next pulse starts.

The width of the gate influences how finely you can resolve range within that window, but the primary thing the gate establishes is the unambiguous range limit. The other aspects—PRF control, transmitter duty cycle, and receiver sensitivity—are governed by separate design choices and aren’t defined by the gate itself.