宽带聚焦波束形成算法优化

Research on broadband focused beamforming algorithm optimization

通过聚焦的方法实现宽带信号的波束形成,可以得到更好的波束形成效果,而且运算量较小,精度更高。在聚焦过程中,聚焦矩阵和聚焦频率选择的偏差会直接影响宽带聚焦波束形成效果,严重时聚焦算法还可能失效,达不到宽带聚焦的目的。利用稳健Capon波束形成算法(RCB)算法对聚焦矩阵进行修正,使宽带信号通过修正的聚焦矩阵全部聚焦在最佳聚焦频率上,最后再对窄带数据利用二阶锥方法实现波束形成。仿真结果表明该算法得到的宽带聚焦波束旁瓣级更低、主瓣更窄。

Using focusing method to realize the broadband signal beam can have better beamforming effect,and the operation is small,and the precision is higher. In the process of focusing,the deviation of the focusing matrix and the frequency selection will directly influence the effect of broadband focusing beam. The algorithm uses the RCB algorithm to correct the focusing matrix,and then the broadband signals are focused on the best focusing frequency by the corrected focusing matrix. Finally,the narrowband signals are beamformed by the SOCP algorithm. The simulation results show that the broadband focusing beam has lower sidelobe level and narrower main lobe by using this algorithm.