大规模面阵分级波束形成算法研究

为了解决大规模阵列宽带数字波束形成系统实现复杂这一问题,结合子阵内波束合成对相位不敏感的特性,设计了一种基于子阵的分级波束形成算法.首先根据阵列合成带宽、频段、阵列规模等信息参数确定子阵规模,在子阵内利用移相器进行移相处理,实现窄带模拟波束合成;其次在子阵间利用FIR滤波器对宽带信号进行时延的精确控制,实现宽带数字波束...

Research on hierarchical beamforming algorithm forlarge-scale area array

In order to solve the problem of complex implementation of large-scale array broadband digital beamforming system,combined with the phase insensitive characteristic of beamforming in subarrays,a hierarchical beamforming algorithm based on subarrays was designed.Firstly,the size of the sub-array was determined according to the information parameters such as the array synthesis bandwidth,frequency band,and array size.The phase shift processing in the sub-array was performed to achieve narrow-band analog beam synthesis by using a phase shifter.Secondly,the FIR filters were used to precisely control the time delay of the broadband signal between the sub-arrays to realize the broadband digital beam synthesis,thereby the adjustment of the beam synthesis error in the sub-array was completed.Finally,a simulation test on the large-scale area array hierarchical beamforming algorithm was performed.The results show that the sub-array-based hierarchical beamforming algorithm can achieve the required beam performance indicators,and at the same time it can effectively reduce the implementation complexity of the large-scale area array broadband digital beamforming system.The designed sub-array-based hierarchical beamforming algorithm can be applied to large-scale phased array beamforming,which has certain reference value for engineering realization.