Airborne PD radar high-fidelity and non-homogeneous ground clutter simulation method based on DEM and DLCD

Abstract

The invention discloses an airborne PD radar high-fidelity and non-homogeneous ground clutter simulation method based on DEM and DLCD. The method comprises the steps of: intercepting DEM data and DLCD; calculating a slant distance, a azimuth angle, a pitching angle and a wiping angle; performing shading treatment on each surface scattering point according to the wiping angle and the slant distance; determining the geomorphology type, and respectively matching each geomorphology type with a corresponding backward scattering coefficient model; calculating the backward scattering coefficient of each surface scattering point of all places within the PD radar action range; and substituting the slant distance, the azimuth angle, the pitch angle and the backward scattering coefficient into a Wardmodel, thereby realizing the steps of clutter simulation and the like. According to the airborne PD radar high-fidelity and non-homogeneous ground clutter simulation method based on DEM and DLCD, forsolving the high-fidelity and non-homogeneous ground clutter simulation problem, the DLCD is introduced on the basis of DEM data, the backward scattering coefficient is calculated by matching the geomorphology type information in the DLCD with the different backward scattering models, and the airborne PD radar high-fidelity and non-homogeneous ground clutter simulation is realized by combining with the Ward ground clutter model, thereby improving the accuracy and the authenticity of the ground clutter simulation.

Description

technical field [0001] The invention belongs to the field of airborne pulse Doppler (PD) radar non-uniform clutter simulation technology, in particular to a high-fidelity non-uniform airborne PD radar based on digital elevation model (DEM) and digital surface classification data (DLCD). Uniform clutter simulation method. Background technique [0002] Compared with ground-based radar, airborne radar has good vision and maneuverability, strong survivability, and can detect ultra-low-altitude flying targets and ground moving targets. When the airborne PD radar works in down-looking mode, the useful signal will be covered by strong ground clutter, so the suppression effect of ground clutter will directly affect the performance of target detection and parameter estimation. At present, airborne radar ground clutter suppression mainly adopts adaptive processing technology, and the adaptive processing technology based on uniform clutter needs to meet the RMB criterion to estimate t...

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Problems solved by technology

The above method integrates the prior geographic information data into the ground clutter simulation, and obtains more realistic ground clutter simulation results, but the backscatter coefficient model adopted by the above method is relatively simple, and the terrain factor is determined only from the DEM data. Landform type, the data resolution is not high, and the classification of landforms is relatively rough, which cannot be used for high-fidelity fitting of non-uniform real terrain

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