Northwest Electromagnetics and Acoustics Research Laboratory, Department of Electrical Engineering, Portland State University, Portland, Oregon 97201-0751, USA.
J Acoust Soc Am. 2012 Oct;132(4):EL264-70. doi: 10.1121/1.4748281.
A physics-based method for beamforming signals measured on a horizontal array is developed with an application to underwater active sonar systems. The proposed striation-based beamformer coherently combines the pressure from each element in the array at different frequencies, and these frequencies are selected based on a striation hypothesis. The linear frequency shift and corresponding phase term introduced in the array weight vector accounts for multipath-induced fading, producing beam output with increased signal gain. The method is demonstrated using data collected on an array towed in the North Atlantic. The combination of the striation-based beamformer with the waveguide invariant concept to improve tracker performance is discussed.
提出了一种基于物理的水平阵信号波束形成方法，应用于水下主动声纳系统。所提出的条纹基波束形成器在不同频率下相干地组合了阵列中每个元件的压力，这些频率是基于条纹假设选择的。在阵列权向量中引入的线性频率偏移和相应的相位项，用于补偿多径引起的衰落，从而产生具有更高信号增益的波束输出。该方法使用在北大西洋拖曳的阵上采集的数据进行了验证。讨论了将条纹基波束形成器与波导不变性概念相结合以提高跟踪器性能的问题。
