Study On Analisis And Synthesis Of Conformal Array Antenna

Compared with the traditional planar array antenna,the conformal array antenna has a wider field of view and higher structural flexibility,and can better adapt to the conformal carrier without affecting the aerodynamic performance of the carrier and improving the space utilization of the equipment Therefore,it has been increasingly widely used in airborne and shipborne radars,base stations,satellite communications and other fields.However,the classical theories in planar arrays cannot be directly applied to the design and synthesis of conformal arrays.In the actual design of conformal arrays,it is necessary to evaluate the performance of the arrays under different array scales,array layouts,and element configurations.Aiming at this engineering problem,this thesis conducts research on the rapid analysis and synthesis of conformal arrays.The main work content is as follows:1.The fast calculation method of conformal array antenna pattern under the condition of arbitrary curved surface and arbitrary polarization is studied.Based on the space coordinate system transformation and synthesis of the isolated pattern,this thesis realizes the approximate calculation and analysis of the far-field pattern of the conformal array antenna,and compares the calculation results with the full-wave simulation results to verify the correctness of the analysis method.Furthermore,based on the maximum gain theorem,this thesis analyzes and optimizes the amplitude and phase of the element feed,and solves the problem of the scan gain decrease caused by the polarization rotation of the circularly polarized element in the conformal array.In order to solve the time-consuming problem in array synthesis,a parallel acceleration method for conformal array pattern calculation is studied in this thesis.In this thesis,two acceleration algorithms suitable for different scenarios are implemented based on CPU and GPU respectively.In this thesis,the fast calculation of the pattern is realized by caching the result of the transformation of the pattern coordinate system and parallelizing the loop expansion of part of the matrix operation process.In order to further improve the acceleration effect,based on the Compute Unified Device Architecture(CUDA),this thesis realizes the parallel acceleration of the coordinate transformation of the pattern and the superposition of the electric field vector on the GPU,and realizes the rapid evaluation of the pattern of the conformal array antenna(including large Scale conformal array antennas,etc.).2.Study the layout method of large-angle scanning conformal array and its low sidelobe comprehensive design.On the basis of parallel fast calculation,this thesis takes the hemispherical array as the research object,and analyzes the classic spherical array method and its scanning performance,such as the regular icosahedron triangulation array.In order to solve the limitations of the classic array method,such as the inability to apply to aspherical surfaces,inflexible configuration of the number of elements,and uneven spatial distribution,this thesis proposes a random array method based on Poisson disk sampling,which realizes the Uniform array on any curved surface and flexible configuration of the number of elements.The low sidelobe synthesis and sparse design of conformal array based on differential evolution algorithm is studied.In this thesis,the feed amplitude of the array is optimized based on the differential evolution algorithm,and the low sidelobe optimization synthesis of the traditional cylindrical array and spherical array is realized.On this basis,this thesis further implements the sparse design of conformal arrays through variable coding conversion.