Kleiman Avital, Cohen Israel, Berdugo Baruch
Andrew and Erna Viterby Faculty of Electrical and Computer Engineering, Technion-Israel Institute of Technology, Technion City, Haifa 3200003, Israel.
Sensors (Basel). 2021 Oct 31;21(21):7253. doi: 10.3390/s21217253.
Designing beampatterns with constant beamwidth over a wide range of frequencies is useful in many applications in speech, radar, sonar and communication. In this paper, we design constant-beamwidth beamformers for concentric ring arrays. The proposed beamformers utilize the circular geometry to provide improved beamwidth consistency compared to beamformers which are designed for linear sensor arrays of the same order. In the proposed configuration, all sensors on each ring share the same weight value. This constraint significantly simplifies the beamformers and reduces the hardware and computational resources required in a physical setup. Furthermore, a theoretical justification of the beamforming method is provided. We demonstrate the advantages of the proposed beamformers compared to the one-dimensional configuration in terms of directivity index, white noise gain and sidelobe attenuation.
在语音、雷达、声纳和通信等众多应用中，设计在很宽频率范围内具有恒定波束宽度的波束图非常有用。在本文中，我们为同心环阵列设计了恒定波束宽度的波束形成器。与为相同阶数的线性传感器阵列设计的波束形成器相比，所提出的波束形成器利用圆形几何结构来提供更好的波束宽度一致性。在所提出的配置中，每个环上的所有传感器共享相同的权重值。这一约束显著简化了波束形成器，并减少了物理设置中所需的硬件和计算资源。此外，还提供了波束形成方法的理论依据。我们展示了所提出的波束形成器与一维配置相比在方向性指数、白噪声增益和旁瓣衰减方面的优势。
