基于均匀同心圆阵列的近场宽带波束形成

该文提出了一种频率不变近场宽带波束形成的方法。该方法将均匀同心圆阵列的输出经傅里叶逆变换转换成相位模式信号,并经过近场矫正和频率补偿网络,可达到频率响应不变的远场阵列响应效果。在此基础上,该文将传统远场窄带波束形成法推广到近场宽带阵列中。仿真结果表明,该文提出的近场宽带阵列响应具有近似频率响应不变的效果,其波束图也接近远场窄带阵列波束图。另外,与其他几种波束形成方法相比,基于该文提出的频率不变近场宽带阵列提升了波束形成性能,且具有较低的计算复杂度。

Near field Broadband Beamforming Based on Uniform Concentric Circular Array

A method of frequency invariant near field broadband beamforming is proposed in this paper. The output signals of a uniform concentric circular array (UCCA) are converted into phase mode signals by using inverse discrete Fourier transform (IDFT), and a far field array with frequency invariant response is then approximately achieved by using the near field correction and frequency compensation network. Therefore, the traditional far field narrow band beamforming methods can be extended to the proposed near field broadband array. The simulation results show that the array response of the near field broadband array is approximately frequency invariant, and its beam pattern is also similar to that of the far field narrow band array. In addition, compared with other beamforming methods, the performance of the proposed frequency invariant near field broadband array is significantly improved with even lower computational complexity.