Doppler beam sharpening

Doppler beam sharpening (DBS)

Doppler beam sharpening (DBS)click for a larger image
A Doppler correction to eliminate background clutter when aircraft radar aerial points in a direction other than straight ahead and consequently the computer breaks each reading into small pieces and reassembles them as a high-resolution map.
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The radar also has basic air-to-ground functions, such as terrain mapping; ground-target detection, tracking, and ranging; and Doppler beam sharpening. A N019M1 version was proposed for the MiG-29SD and MiG-29SE, which are only prototypes of RSK MiG modernization proposals.
Among them are ground mapping, detection and track of stationary ground targets, ground-moving-target indicator (MTI), Doppler beam sharpening and terrain avoidance.
Doppler beam sharpening uses a coherent low-PRF radar mode.
Its air-to-ground modes included real-beam ground mapping, expanded ground mapping and Doppler beam sharpening.
Doppler beam sharpening relied on the processing of Doppler shift, so was only available at angles between 15 and 60 degrees off the aircraft's velocity vector.
The resolution available from Doppler beam sharpening is limited by the antenna dwell time--the length of time for which the patch of terrain being observed is illuminated by the radar beam.
The purely air-to-air processor C.90 was replaced by the Bagiet, adding several air-to-ground modes, such as ground mapping, detection and track of static ground targets, ground-moving-target indication, Doppler beam sharpening, and terrain avoidance.
The radar has also basic air-to-ground functions, such as terrain mapping; ground-target detection, tracking, and ranging; and Doppler beam sharpening. A N019MI version was proposed for the MiG-29SD and MiG-29SE, which are only prototypes of RSK MIG modernization proposals.
Among them are ground mapping, detection and track of stationary ground targets, ground-moving-target indicator (MTI), Doppler beam sharpening, and terrain avoidance, In the meantime, work on a bigger version of the Zkuk started.
Modes: RWS = range while scan TWS = track while scan LD/SD = look-down/shoot-down ATA = automatic threat assessment RA = raid assessment CM = combat maneuver (close combat) GTD = ground-target detection GTT = ground-target tracking GMTI = ground-moving-target indication DBS = Doppler beam sharpening SAR = synthetic-aperture radar PF = picture freeze TA = terrain avoidance TF = terrain following
Doppler beam sharpening (DBS) is an effective technique to improve the azimuth resolution of airborne pulse Doppler radar in its air-to-ground mode.
Air-to-surface modes include ground mapping (with or without Doppler beam sharpening), beacon interrogation, freeze (radar silent), ranging, sea search, fixed target tracking and moving sea target tracking.