On Robust Beamforming for Distorted Towed Linear Array Using Product Theorem

• Published in: Acoustics Australia Vol. 48; no. 2; pp. 211 - 219
• Main Authors: Lu, Daiqiang, Xing, Gaoxiang, Luo, Tao, Zhang, Qi
• Format: Journal Article
• Language: English
• Published: Singapore Springer Singapore 01.08.2020; Springer Nature B.V
• Subjects: Acoustics; Arrays; Beamforming; Distortion; Engineering; Engineering Acoustics; Linear arrays; Mathematical analysis; Noise Control; Noise levels; Original Paper; Performance degradation; Robustness; Sea trials; Signal processing; Theorems; Secondary beamforming; Array shape distortion; Linear array; Sub-array; Product theorem
• ISSN: 0814-6039; 1839-2571
• DOI: 10.1007/s40857-020-00189-z

To solve the beamforming performance degradation problem of the towed linear array caused by the shape distortion, we propose a robust beamforming way for distorted towed linear array. The proposed method basically uses the segmented processing, which can be divided into 3 steps. Firstly, towed linear array is divided into sub-arrays. Then, the weights of sub-arrays are obtained and outputs of beamforming of sub-arrays are obtained. In the end, according to the principle of the product theorem, the correlation calculations are performed on the output of the sub-array. Due to the adoption of sub-array correlation calculations, the proposed method can upgrade beamforming performance. Compared with the traditional distortion array processing method, the proposed method can improve the local signal-to-interference plus noise ratio (SINR) by about 2–3 dB. Simulation and sea trial data verify the effectiveness of the proposed method.