The invention provides a method for eliminating terrestrial clutters of an airborne
weather radar based on
terrain altitude data. The method provided by the invention comprises the following steps of: reading
airplane position and
radar parameters, establishing a local rectangular coordinate
system, calculating longitudes and latitudes of ground sampling points in a
beam direction, reading DEM (
Digital Elevation Model) data, calculating a lower
view angle sequence of the sampling points relative to an
airplane, analyzing a tendency of the lower
view angle sequence, judging a monotonically decreasing sequence, eliminating a non-monotonically-decreasing lower
view angle value, determining a beam grounding range, editing echo signals and replacing by a background, updating the
airplane position and an antenna
azimuth angle, judging whether the scanning is finished, displaying complete scanning echo signals by a
radar display screen and the like. According to the method provided by the invention, by utilizing the characteristics that the terrestrial clutters of the airborne
weather radar echoes and weather targets are respectively located at units with different distances and can be separated in the distance and adopting the discipline characteristics of the lower view angle, the grounding position of the
radar beam is analyzed, and the terrestrial clutters is eliminated by utilizing and utilizes the
terrain altitude data; and the method has the advantages of simple method, calculation accuracy, good inhibition effect, capability of effectively eliminating terrestrial cluttersof the airborne
weather radar in a
time domain and the like.