基于Gordon积分法的大型阵列天线RCS高效计算方法OA

[Objective]To address the challenges of balancing accuracy and computational efficiency,ex-cessive mesh density under high-frequency incidence conditions,and high computational resource consump-tion in the RCS calculation of large-scale array antennas,a subarray extrapolation method based on Gordon's integral method is proposed.By utilizing full-wave simulation results of small-scale subarrays,the RCS char-acteristics of large array antennas can be efficiently and accurately extrapolated.[Method]Considering the differences in the spatial characteristics of array elements,the entire array is divided into several typical subar-ray units,and the aperture fields of these units are extracted from different regions.Gordon's integral method is introduced to convert the two-dimensional surface integral into a line integral along polygon boundaries,there-by accelerating the near-field-to-far-field transformation,reducing mesh density requirements,and improving the computational efficiency of equivalent surface current calculations.A spatial extrapolation mapping of scattering characteristics is achieved through phase correction factors,and the overall scattering field of the target array is subsequently obtained.[Results]For Vivaldi array antennas and multi-layer stacked patch array antennas,the proposed method is validated through monostatic and bistatic RCS extrapolation ex-periments,respectively.Compared with full-wave simulation results,the proposed method achieves a three-fold increase in computational speed while maintaining a relative root mean square error of less than 5%.[Conclusion]The proposed RCS extrapolation method achieves both high computational accuracy and excellent efficiency,providing an efficient and reliable approach for RCS calculation of large-scale array an-tennas.