Design And Beam Synthesis Of Missile-borne Conformal Array

In the design of existing missile-borne weapon systems,the selection of array antennas must be based on miniaturization,low profile,low Radar Cross-Section(RCS)and high performance.Array antennas can control beams flexibly and achieve large-scale detection targets during beam synthesis,which is an important demand of array signal processing.Compared with the traditional linear array or planar array,the conformal arrays antenna matches the shape of the carrier.Meet the characteristics of missile-borne antenna,which is conducive to the integrated design of pneumatic or stealth.The design can reduce the probability of being intercepted;the use of digital array technology for conformal arrays can realize the characteristics of fast and accurate beam scanning and wide-angle scanning,so as to complete the flexible and rapid control of the beam,in addition,the multi-beam search can be realized through sub-array division,the scanning range of the missile-borne radar beam is expanded to 90,and the effective aperture of the large-scale scanning is improved.Therefore,this thesis revolves around a research task,for the purpose of realizing multi-target detection in large airspace,researches on the design of missile-borne conformal arrays and beam synthesis methods.The related methods of time-sharing multi-beam synthesis,simultaneous multi-beam synthesis and wide beam synthesis for multiple sub-arrays of conformal array with truncated cone are studied,then,the simulation and analysis of time-sharing multi-beam synthesis,simultaneous multi-beam synthesis,and beam synthesis with a single beam that doubles the width compared to which of circular aperture planar array.The specific work can be summarized as follows:1.The configuration and array layout design for missile-borne conformal array and time-sharing multi-beam synthesis of its multi-sub-array.Modeling the seeker with truncated cone structure.Through comparing the performance,the rectangular trellis is used to arrange the side of the truncated cone,and the mirror-symmetric is used to arrange the upper surface of truncated cone.In order to achieve multi-target detection in large airspace,two types of sub-array division methods of the truncated cone-shaped conformal arrays are studied: fixed division and dynamic division,and then separately perform time-sharing multi-beam forming,that is,each sub-array perform single beam synthesis separately,and then directly superimpose the directional patterns of multiple sub-arrays to obtain a time-sharing multi-beam comprehensive directional pattern.Simulation experiments show that the use of multiple sub-arrays partitioning can achieve the purpose of multi-target detection in large airspace,but the hardware implementation is more complicated;And thus determine the division of the beam scanning range of the cone table array are azimuth from-90° to 90° and pitch angle from 0° to 45°,while the beam scanning range of the four sub-arrays on the side of the cone table are azimuth from-90° to 90° and pitch angle from-90° to-45° and from 45° to 90°.2.Research and verification of the simultaneous multi-beam synthesis method of the missile-borne conformal array.In order to complete the simultaneous multi-beam comprehensive design of the missile-borne conformal array,this thesis proposes a hybrid adaptive particle swarm optimization shaping algorithm.In the population update module of the particle swarm algorithm using dynamic inertia weights,genetic algorithm selection,crossover and mutation operation are adopted.Adjust the cross-mutation probability according to the degree of convergence,and dynamically weight the fitness function.In addition,the fixed acceleration factor can be adjusted to an adaptive change form or add random interference to jump out of local convergence according to the needs of the actual optimization problem;and suitable for Beam forming for large and complex arrays is not limited to array structure and array layout.The main point of its design is to select a reasonable optimization object and fitness function according to the optimization goal;The simultaneous two-beam synthesis and three-beam synthesis of the planar array verify the feasibility of the algorithm.on this basis,the shape optimization design of the five-beam synthesis and the single wide-beam synthesis of the truncated cone-shaped conformal array constructed in this thesis were carried out.The simulation results show that the hybrid adaptive particle swarm optimization shaping algorithm proposed in this thesis can meet the shaping requirements of the conformal array on the missile.of course,the results obtained through optimization algorithm is a non-inferior solution,not necessarily the optimal solution.