We are looking at a target 25 miles away. When a RADAR is being operated on the 25 mile range setting what is the most appropriate pulse width and pulse repetition rate?
• Maximum unambiguous range vs. pulse repetition rate (pps) • Effect of pulse width (μs) on minimum range and target resolution • Relationship between range setting (25 miles) and suitable PRR (high vs. low)
• For a 25‑mile range scale, should the radar use a higher or lower pulse repetition rate to avoid echoes from beyond the selected range folding back? • Does a longer or shorter pulse width give better range resolution for a single target at 25 miles, and what do real marine radars typically do on long‑range scales? • Compare which answer choices combine a realistic PRR for long range with a practical pulse width used on 24–48 mile scales.
• Compute how far radio waves travel in 1 microsecond (μs) and compare that to miles of range coverage. • Remember that higher PRR gives better update rate but reduces maximum unambiguous range; lower PRR allows longer range. • Eliminate any combination that would be typical for short‑range (e.g., 1–6 mile) operation rather than a 25‑mile scale.
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