基于对角负载的波束空间波束合成器

Beam space beamformers with diagonal loading

同传统的阵元空间波束合成器相比,波束空间波束合成器通过减少自由度来实现运算量的减少。但该方法由于阵列失配的影响,会使系统性能大大降低。从理论上证明了在波束空间自适应阵列中,同样可以采用对角负载技术克服阵列失配,同时给出了此时对角负载方法的实现步骤、负载值的选择及阵列的增益参数。仿真结果证明了对角负载方法对波束空间波束合成器稳健性提高的有效性。

The computational complexity of beam space beamformers is reduced through reducing the num ber of degreesof freedom compared with the traditional element space beamformers, But the adaptive algorithm generates a beam pattern with distorted main beam and high side lobes because of the same array mismatch. Diagonal loading is not an effective method to improve the robustness of the beamformer in element space, but also in beam space. The steps of beam space DL algorithm, the expression of load value and array gain are intro duced. Simulation results show that the DL method can improve the array gain for beam space beamformer.