Research On Clutter Simulation And Clutter Characteristics For Airborne Three-Dimensional Heterogeneous Array

The three-dimensional isomorphic array can be equivalent to the superposition of multiple pre-and post-interlaced planar arrays,which belongs to the most general form of the array,and therefore need to establish a more general uniform clutter model to meet the three-dimensional heterogeneous array The requirement of modeling the ground clutter in any formation.Three-dimensional isomorphic matrix is more complicated than the two-dimensional regular array,resulting in its clutter characteristics are more complex.In this paper,the three-dimensional isomorphic array is not arranged regularly,there is no universal pattern calculation formula and the clutter echo model of the problem,a comprehensive consideration of the impact of three-dimensional heterogeneous array of clutter echoes of various factors,Based on this model,the clutter simulation and clutter characteristics were studied based on this model.The main work of this paper is as follows: 1.The traditional phased array spatial beamforming theory is extended to the polarized domain-space domain.Considering the influence of the occlusion effect of the three-dimensional heterogeneous array on the beamforming,the array polarization-space vector and array of three-Polarization direction of the unified calculation method,and gives the mutual coupling factors on the array pattern of the two corrections.2.Based on some simplified assumptions,the joint clutter model of the airborne three-dimensional isomorphic array in the air-time-polarization domain is established,and the model and calculation method of the various parameters in the clutter model are given: Electromagnetic polarization model,clutter amplitude distribution statistical model,clutter power spectrum model.Finally,the three-dimensional cylindrical array,three-dimensional cone array,cylindrical cone adjacent three-dimensional isomorphic array,cylindrical cone-separated three-dimensional isomorphic array pattern simulation and clutter PD processing distance Doppler simulation.3.Based on the above model and simulation,the common clutter echo decorrelation factors(angle de-correlation,polarization de-correlation,waveform decorrelation,etc.)were analyzed theoretically and verified,and the clutter To the relevant conditions.Then,the influence of the mutual coupling on the three-dimensional cylindrical array pattern and the clutter distribution is given from the simulation point of view,and the clutter space-time characteristics of the three-dimensional heterogeneous array are analyzed theoretically.4.The method of angle estimation based on phase jitter DDMA signal is proposed,including maximum likelihood method,maximum likelihood iterative method,adaptive angle curve method and adaptive single pulse method.The simulation results show that the four-Method of performance.