Word: blip
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...back & forth motion. In doing this mannered dance, it probes the air ahead with far-reaching radar pulses. If the air is empty, a single line of light glows on the radar-man's scope. When a pulse bounces back from the enemy, a jog or "blip" appears in the line...
...observer makes his adjustments; the radar "locks" to the enemy and steers the plane toward him. The "blip" grows brighter and clearer. By this time the pilot is watching his own radar, which shows a bright green targetlike circle with a smaller circle inside...
From a story by Blip...
...simplest terms, a radar set shoots radio energy at a target, catches the reflected echo, times the round trip, divides by two, and. since the speed of the radio wave is known, translates all the information into a "blip" of light on a fluorescent (television) screen showing the target's distance and position...