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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Theoretical assessment of a synthetic aperture beamformer forreal-time 3-D imaging
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Theoretical assessment of a synthetic aperture beamformer forreal-time 3-D imaging

机译：实时3D成像的合成孔径波束成形的理论评估

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摘要

A real-time 3-D imaging system requires the development of anbeamformer that can generate many beams simultaneously. In this paper,nwe discuss and evaluate a suitable synthetic aperture beamformer. Thenproposed beamformer is based on a pipelined network of high speedndigital signal processors (DSP). By using simple interpolation-basednbeamforming, only a few calculations per pixel are required for eachnchannel, and an entire 2-D synthetic aperture image can be formed in thentime of one transmit event. The performance of this beamformer wasnexplored using a computer simulation of the radiation pattern. Thensimulations were done for a full 64-element array and a sparse arraynwith the same receive aperture but only five transmit elements. Wenassessed the effects of changing the sampling rate and amplitudenquantization by comparing the relative levels of secondary lobes in thenradiation patterns. The results show that the proposed beamformernproduces a radiation pattern equivalent to a conventional beamformernusing baseband demodulation, provided that the sampling rate isnapproximately 10 times the center frequency of the transducer (34%nbandwidth pulse). The simulations also show that the sparse array is notnsignificantly more sensitive to delay or amplitude quantization than thenfull array
机译：实时3D成像系统需要开发可同时产生许多光束的波束形成器。在本文中，我们将讨论和评估合适的合成孔径波束形成器。然后提出的波束形成器基于高速数字信号处理器（DSP）的流水线网络。通过使用简单的基于插值的n波束形成，每个n通道仅需要对每个像素进行少量计算，并且可以在一个发射事件的时间内形成整个2D合成孔径图像。使用辐射方向图的计算机仿真来探索这种波束形成器的性能。然后对具有相同接收孔径但只有五个发射元件的全64元素阵列和稀疏阵列进行了仿真。温纳通过比较辐射模式中次瓣的相对水平，评估了改变采样率和幅度量化的效果。结果表明，假设采样率约为换能器中心频率（34％n带宽脉冲）的10倍，则所提出的波束形成器会产生与传统波束形成相同的辐射方向图。仿真还表明，与全阵列相比，稀疏阵列对延迟或幅度量化的敏感程度不明显

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