Technology / Radar / Sweep: Determined by the time base or range calibration, the radial movement of the stream of electrons impinging on the face of the cathode-ray tube. The origin of the sweep is the center of the face of the cathode-ray tube or ppi. Because of the very high speed of movement of the point of impingement, the successive points of impingement appear as a continuously luminous line. The line rotates in synchronism with the radar antenna. If an echo is received during the time of radial travel of the electron stream from the center to the outer edge of the face of the tube, the sweep will be increased in brightness at the point of travel of the electron stream corresponding to the range of the contact from which the echo is received. Since the sweep rotates in synchronism with the radar antenna, this increased brightness will occur on the bearing from which the echo is received. With this increased brightness and the persistence of the tube face, paint corresponding to the object being ‘illuminated’ by the radar beam appears on the ppi.
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Sweep Verb Synonyms: pass, clearance, stroke, purge
Sweep Noun Synonyms: brush, whisk, clean, clear, tidy up
Technology / Radar / Sweep Jamming: Sweep jamming aims to counter a number of different radar systems spread in frequency over a wide band by continuously sweeping the jamming frequency across the band. MORE
Technology / Television (TV) / Sweeps: Time period during which Nielsen Media Research conducts seasonal ratings of network television programs. MORE