波束转向数据的阵列成像。

Array imaging with beam-steered data.

机构信息

Dept. of Electr. and Comput. Eng., State Univ. of New York, Buffalo, Amherst, NY.

出版信息

IEEE Trans Image Process. 1992;1(3):379-90. doi: 10.1109/83.148610.

Abstract

The author presents a system model and inversion for the beam-steered data obtained by linearly varying the relative phase among the elements of an array, also known as phased array scan data. The system model and inversion incorporate the radiation pattern of the array's elements. The inversion method utilizes the time samples of the echoed signals for each scan angle instead of range focusing. It is shown that the temporal Fourier transform of the phased array scan data provides the distribution of the spatial Fourier transform of the reflectivity function for the medium to be imaged. The extent of this coverage is related to the array's length and the temporal frequency bandwidth of the transmitted pulsed signal. Sampling constraints and reconstruction procedure for the imaging system are discussed. It is shown that the imaging information obtained by the inversion of phased array scan data is equivalent to the image reconstructed from its synthesized array counterpart.

摘要

作者提出了一种针对通过线性改变阵列单元之间的相对相位（也称为相控阵扫描数据）获得的波束转向数据的系统模型和反演。该系统模型和反演结合了阵列单元的辐射模式。反演方法利用每个扫描角的回波信号的时间样本，而不是距离聚焦。结果表明，相控阵扫描数据的时间傅里叶变换提供了被成像介质的反射率函数的空间傅里叶变换的分布。这种覆盖范围的程度与阵列的长度和发射脉冲信号的时间频率带宽有关。讨论了成像系统的采样约束和重建过程。结果表明，通过相控阵扫描数据的反演获得的成像信息与从其合成阵列对应物重建的图像等效。