任意形状旁瓣波束形成技术研究

在自适应零陷形成的基础上,提出了一种自适应加权算法,用于任意阵型阵列构成具有任意形状旁瓣的波束图,并考虑基元方向性对波束图的影响.给出了实现自适应加权算法的三个步骤,预先设定所需旁瓣形状及旁瓣级,采用循环,最终使旁瓣与预设形状吻合.将该算法用于均匀线阵和抛物线阵,均得到期望的结果,并与道夫-切比雪夫加权作了相应比较.研究表明,基元的方向性对该算法波束形成的影响很小,新算法可以消除基元宽带方向性对波束的影响.

Research on the Technology of Arbitrary Shape Sidelobe Beamforming

An adaptive weighting algorithm is proposed based on the adaptive null beamforming technology,which can be used for forming arbitrary sidelobe shape beam pattern for arbitrary structure arrays,considering the effect of element directivity at the same time.Three steps are given to implement the new algorithm;by presetting the sidelobe shape and sidelobe level and having cycle steps,the real beam pattern will close to the presetting one.The new algorithm is applied to arrays such as uniform linear array and parabola array as examples and compared with Dolph-Chebyshev(DC) weighting algorithm,and all the examples have the desired results.It is shown that the element directivity has little effect on the beamforming by the new algorithm and that the new algorithm can eliminate the effect of the broadband element directivity in broadband beamforming.