A Line Spectrum Extraction Method based on Sonar Array Beam Pattern

摘要

The conventional method of extraction of target line spectrum based on target tracking beam data of sonar array signal. In the presence of multiple target, there are line spectrum interference between targets signal, especially In the low frequency region. It brought difficulties to extraction the target line spectrum correctly. Based on the linear array sonar, this paper analyzes multi-target line spectrum energy distribution in frequency domain and spatial domain. A multi-beam line spectrum model is given under the condition of multi-target array signal. Based on the model, this paper proposes a target line-spectrum extraction method based on multi-beam data. The method transfer array data to multi-beam frequency domain data by frequency domain beamforming. The line spectrum detection is made considering the conditions of frequency domain and spatial domain at the same time. Experimental results based on simulation data have verified the correctness and effectiveness of the proposed method.