滤波求和恒定束宽波束形成器设计

文章在深入分析连续阵的恒定束宽波束形成理论基础上，将阵元权系数等效为两级滤波器，第一级只该与基阵的孔径分布有关，第二级只与基阵的维数有关，给出了滤波器的设计方法。通过时域的滤波求和实现恒定束宽波束形成，避免了频域分解，降低了运算量。该方法可用于一维、二维和三维情况，并且适用于任意带宽。基于非均匀线阵的计算机仿真表明该方法的恒定束宽效果是令人满意的。

Design of beamformer with constant beamwidth based on filtering and summation

Based on the theory of continuous constant beamwidth beamforming, the weighting process is equivalent to two steps of filtering. The first filter is related to the desired aperture distribution, and the second to the dimension of the sensor array. Design of the FIR filter is also considered. To avoid complicated frequency decomposition, beamforming is implemented in the considered. To avoid complicated frequency decomposition, beamforming is implemented in the time domain by filtering and summation. Therefore computation complexity is reduced significantly. The method can be applied to one-, two- and three-dimensional sensor arrays, and is suitable for arbitrary bandwidth. Simulation based on an unequally spaced array is presented to verify the method.