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.
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This work was supported by the National Natural Science Foundation of China (Grant No. 51679247).
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Lu, D., Xing, G., Luo, T. et al. On Robust Beamforming for Distorted Towed Linear Array Using Product Theorem. Acoust Aust (2020). https://doi.org/10.1007/s40857-020-00189-z
- Linear array
- Array shape distortion
- Product theorem
- Secondary beamforming