Research of Modified Hyper-beam Performance based on Passive Sonar

The key to array signal processing is to enhance the processing gain in the background of strong reverberation and high noise while the processing gain plays an important role in improving system detection performance and reducing target detection false alarms. Traditional weighted processing method mainly reduces the side lobe and sharp the beam-width, however, it is difficult to reconcile the two aspects. The output of the hyper-beam loses phase information, and thus post-processing such as spectrum analysis cannot be performed. This paper introduces an idea of modified hyper beam, and then apply it to space-time processing of passive signals. The modified hyper-beam technique uses the output of hyper-beam as weight coefficient to the conventional beam output, which can retain the beam output phase information while reducing the main lobe width and side lobes. The experiment data analysis based on passive sonar verifies that the processing gain brought by the method in this paper can further improve the detection performance and improve the tracking effect.