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目前,恒定束宽宽带波束形成算法中权值拟合运算量较大,当信号与干扰相干时性能恶化。文中将宽带测向中常用的聚焦变换的思想(即频域平滑)运用于权值拟合中,在保证恒定束宽的条件下,实现解相干功能。同时,在聚焦矩阵求取过程中,利用Bessel函数分解导向矢量的性质,构造出可以预先计算并存储的聚焦矩阵,大大减少了权值拟合的运算量。仿真结果验证了本文算法的有效性。
At present, the weight of beamforming in the constant beamwidth broadband beamforming algorithm is large, and the performance deteriorates when the signal and interference are coherent. In this paper, the idea of focus transformation (ie, frequency domain smoothing), which is commonly used in wideband direction finding, is applied to the weight fitting. Under the condition of constant beamwidth, the coherent function is realized. In the meantime, using the Bessel function to decompose the properties of the steering vector during the process of finding the focus matrix, a pre-computed and stored focus matrix is constructed, which greatly reduces the computational complexity of weighting. The simulation results verify the effectiveness of the proposed algorithm.