中国科技论文在线

Currently, the nonadaptive delay-and-sum (DAS) beamformer is extensively used for ultrasound imaging, despite the fact that it has lower resolution and worse interference suppression capability than the adaptive standard Capon beamformer (SCB) if the steering vector corresponding to the signal of interest (SOI) is accurately known. The main problem which restricts the use of SCB, however, is that SCB lacks robustness against steering vector errors that are inevitable in practice. Whenever this happens, the performance of SCB may become worse than that of DAS. Therefore, a robust adaptive beamformer is desirable to maintain the robustness of DAS and adaptivity of SCB. In this paper we consider a recent promising robust Capon beamformer (RCB) for ultrasound imaging. We propose two ways of implementing RCB, one based on time delay and the other based on time reversal. RCB extends SCB by allowing the array steering vector to be within an uncertainty set. Hence, it restores the appeal of SCB including its high resolution and superb interference suppression capabilities, and also retains the attractiveness of DAS including its robustness against steering vector errors. The time-delay-based RCB can tolerate the misalignment of data samples and the time-reversal-based RCB can withstand the uncertainty of the Green’s function. Both time-delay-based RCB and time-reversal-based RCB can be efficiently computed at a comparable cost to SCB. The excellent performances of the proposed robust adaptive beamforming approaches are demonstrated via a number of simulated and experimental examples.

关键词： Adaptive arrays,， array errors,， interference suppression,， robust adaptive beamforming,， robust Capon beamforming,， time delay,， time reversal,， ultrasound imaging.，

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2005年06月30日

【期刊论文】基于高阶统计量的自适应非线性波束形成新算法*

廖桂生，保铮

电子学报，1997，25（3）：102～104，-0001，（）：

摘要

本文提出了一种新的基于高阶统计量的自适应非线性波束形成器（HOS-ANBF），与常规的基于2阶相关矩阵自适应数字波束形成器（ADBF）相比，它的有效阵列孔径得到扩展，可抑制多于阵元数个有源干扰，对主瓣干扰抑制的性能及波束保形得到明显提高，对阵元误差具有更强的容差能力。计算机仿真结果验证了这些结论。

关键词：自适应阵列信号处理，非线性波束形成，高阶统计量

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2005年01月19日

【期刊论文】基于多普勒信息的盲波束形成方法在声呐信号处理中的应用研究

赵俊渭，李洪升，陈华伟，王峰，郭业才

，-0001，（）：

摘要

本文针对水声环境和水声信号的特点，提出了一种可用于任意阵形的自适应神经网络盲波束形成方法。该方法在未知基阵响应向量的情况下，利用水声信号多普勒频率信息，估计波束形成的权矢量，采用神经网络的方法实现盲波束形成，从而避免了矩阵的求逆运算，不但减小了运算量而且易于用硬件实现。此外该算法对系统误差具有很强的鲁棒性。通过拖曳阵和体积阵的仿真实验，验证了所提出方法的有效性和正确性。

关键词：盲波束形成，水声信号，多普勒信息，神经网络，体积阵

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2012年02月24日

【期刊论文】Joint source-and-relay beamforming for multiple-input multiple-output systems with single-antenna distributed relays

李春国， Chunguo Li， Xiang Wang， Luxi Yang， Wei-Ping Zhu

IET COMMUNICATIONS，-0001，（）：

摘要

暂无

关键词： joint beamforming,， MIMO,，

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