Conventional beamforming technology is widely used in passive sonar engineering practice

in view of its simple principle and good robustness

while false alarms due to multilevel sidelobes and low bearing accuracy defect still exist.The method using different split-beam configurations is proposed

considering serial rough and accurate measurement employed in phase interferometer together with energy selection used in phase binning process

to achieve high precision and low false alarm detection.The experimental results show that the proposed method is practical to reduce the sidelobe interference

and the noise background level is reduced by at least 5dB compared to the conventional method.The algorithm is suitable for passive uniform line array

and also has certain reference significance for radar and active sonar in spatial spectrum construction.