Coherent-array imaging using phased subarmys. Part I: Basic principles
Coherent-array imaging using phased subarmys. Part I: Basic principles
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DOI：
10.1109/tuffc.2005.1397349
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发表时间：
2005-01-01
影响因子：
3.6
通讯作者：
Khuri-Yakub, BT
中科院分区：
文献类型：
--
作者：
Johnson, JA;Karaman, M;Khuri-Yakub, BT
相干阵列成像系统的前端硬件复杂性与同时用于信号发送或接收的有源阵列元素的数量成比例。不同的成像方法使用不同数量的活动通道和数据收集策略。传统的全相控阵（EPA）成像在传输和接收时使用所有元件，产生最佳的图像质量，并且具有较高的前端硬件复杂性。相比之下，经典的合成孔径成像（CSA）一次只能发射和接收单个元件，使硬件复杂性最小化，但图像质量较差。我们提出了一种新的相干阵列成像方法——相控子阵（PSA）成像，它在每个发射步骤使用相邻元素的子集来执行部分发射和接收波束形成。该方法将活动信道的数量减少到子数组元素的数量；这些信道在整个阵列上进行多路复用，并且从每个子阵列获取较少数量的波束。低分辨率子阵列图像横向上采样、插值、加权和相干求和，形成最终的高分辨率PSA图像。PSA成像降低了前端硬件的复杂度，同时实现了接近FPA成像的图像质量。
The front-end hardware complexity of a coherent array imaging system scales with the number of active array elements that are simultaneously used for transmission or reception of signals. Different imaging methods use different numbers of active channels and data collection strategies. Conventional full phased array (EPA) imaging produces the best image quality using all elements for both transmission and reception, and it has high front-end hardware complexity. In contrast, classical synthetic aperture (CSA) imaging only transmits on and receives from a single element at a time, minimizing the hardware complexity but achieving poor image quality. We propose a new coherent array imaging method-phased subarray (PSA) imagine-that performs partial transmit and receive beam-forming using a subset of adjacent elements at each firing step. This method reduces the number of active channels to the number of subarray elements; these channels are multiplexed across the full array and a reduced number of beams are acquired from each subarray. The low-resolution subarray images are laterally upsampled, interpolated, weighted, and coherently summed to form the final high-resolution PSA image. The PSA imaging reduces the complexity of the front-end hardware while achieving image quality approaching that of FPA imaging.