What is a blind sector in radar operation?

• A. A blind sector is an area of the radar sweep where no data is received
• B. A blind sector is a region of the sky not scanned
• C. A blind sector is a portion of the scan where detections are not updated
• D. A blind sector is the area behind the ship

Answer: (C)

In radar operation, focus is on how often targets are refreshed with new bearing and range information as the antenna sweeps. A blind sector is the portion of the scan where detections are not updated. The radar may still be sweeping and receiving returns, but the tracking logic isn’t producing fresh updates for targets within that angular region, so their displayed positions can become stale until the next update or until the target is reacquired. This can happen due to processing limits, clutter filters, or signal quality in that sector, rather than an outright absence of radar data. It’s different from a completely data-empty area or a region that isn’t scanned; it’s specifically about the lack of updates to existing detections within part of the scanned arc.