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Doppler Beam Sharpening

A coherent ground map mode which provides higher azimuth resolution by processing the radar return signal phase to exploit the doppler dependency on azimuth angle. The DBS mode is defined as having constant angular resolution, as opposed to the constant cross-range resolution of SAR. The DBS mode provides a large area map and is useful for defining land/water boundaries, landmark identification, etc. The display format is Plan Position lndicator (PPl) with large range and azimuth extent to provide wide coverage of the aircraft forward sector similar to Real Beam Ground Map (RBGM). The DBS mode forms an image while scanning the antenna toward the velocity vector.