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在时域上实现多波束形成,其运算量与系统时空采样点数的平方成正比.木文提出以“交迭-贮存”的方法计算输入信号与时延横向滤波器脉冲响应的卷积,再根据Farrier等人的工作,用FFT算法完全实现时域上的圆阵多波束形成.因此在节省运算量的同时,保证了结果的准确.文中给出了计算机模拟计算的结果,同时还提出了一种非整数倍采样周期时延的方法,改善了指向特性.
In the time domain, multi-beamforming is realized, and the computation amount is proportional to the square of the sample space-time sampling points.Wu-Wen proposes to calculate the convolution of the impulse response of the input signal and the delay transversal filter by the method of “overlap-store” According to the work of Farrier et al., The circular array multi-beamforming in the time domain is completely realized by the FFT algorithm, thereby saving the computation amount and ensuring the accuracy of the result. The paper gives the result of the computer simulation calculation, A non-integer multiple sampling period delay method to improve the directional characteristics.