For open sea and longer range, which pulse size is preferred?

• A. Long
• B. Short
• C. Medium
• D. Ultra-Long

Answer: (A)

Longer pulse length increases energy per pulse, which is crucial for detecting distant targets on open water. The energy per pulse is essentially peak power times pulse duration, so extending the duration delivers more energy to the return echo. That higher energy improves the signal-to-noise ratio and extends the maximum detectable range, making distant objects more likely to be seen. The trade-off is poorer range resolution, since a longer pulse blurs targets that are close in range. In open-sea surveillance, where targets are often spread out and long-range detection is the goal, this loss in resolution is acceptable and the gain in detectability at long range is worth it. Shorter pulses provide finer range resolution but deliver less energy per pulse, making distant targets harder to detect.