利用空间平滑提高小快拍数时的自适应波束形成性能

Improvement of the performance of adaptive beamforming with a small number of snapshots via spatial smoothing

文中利用空间平滑法,研究提高小快拍数条件下的自适应波束形成性能.由于采用子阵前后向平滑,等效地提高了快拍数,且显著地提高了小快拍数时的自适应波束形成性能.同时,考虑了对信号指向各子阵间的相位线性递增关系,可将子阵的自适应权值递推为全阵列的权,避免了子阵处理带来的孔径损失。计算机模拟验证了这些优点.

A method for improving the performance of adaptive beamforming with a small number of snapshots via spatial smoothing is presented.Through forward and backward smoothing,the corresponding number of snapshots can be greatly raised,so that the performance of adaptive beamforming with a small number of snapshots can be significently improved.Furthermore,the phase relationship of each subarray to the desired signal is considered,and adaptive weights should be corrected according to this phase relationship in order to decrease the loss of the desired signal power resulting from subarray processing.Results of computer simulations are included to support our analysis.