基于CIC 内插时延的宽带数字阵列波束形成

针对宽带数字阵列采用传统窄带波束形成方法导致的方向图指向偏移、主瓣畸变问题,提出了一种基CIC内插的时延补偿方法。该方法不仅通过内插的方式实现宽带数字阵各个阵元时延的精确补偿,而且所需的乘法运算次数不随数字阵列合成波束数的增加而增加。仿真结果表明:该方法应用于宽带数字阵列多波束形成时,处理性能与基于分数时延滤波方法相当,但需要的乘法运算次数明显少于后者,因此具有很好的工程实现价值。

Wideband Digital Array Beamforming Based on CIC Interpolation

Aiming at the beam pattern deviation and mainlobe distortion of wideband digital array, using the traditional narrow band beamforming method, a time delay compensation method base on cascade integrator comb (CIC) interpolation is proposed,which not only achieves the each channel time delay compensation of wideband digital array accurately, but also can accomplish wideband digital array multi-beamforming without increasing multiplication times. The simulation results show that the method has the similar performance but obviously low multiplication complexity comparing with the fractional delay filter method, thus it is good for engineering realization.