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胡梦伊, 廖可非, 欧阳缮, 李晶晶. 基于多输入多输出阵列的3D-FDA-SAR成像方法[J]. 桂林电子科技大学学报, 2023, 43(2): 93-98.
引用本文: 胡梦伊, 廖可非, 欧阳缮, 李晶晶. 基于多输入多输出阵列的3D-FDA-SAR成像方法[J]. 桂林电子科技大学学报, 2023, 43(2): 93-98.
HU Mengyi, LIAO Kefei, OUYANG Shan, LI Jingjing. 3D-FDA-SAR imaging method based on multiple-input multiple-output array[J]. Journal of Guilin University of Electronic Technology, 2023, 43(2): 93-98.
Citation: HU Mengyi, LIAO Kefei, OUYANG Shan, LI Jingjing. 3D-FDA-SAR imaging method based on multiple-input multiple-output array[J]. Journal of Guilin University of Electronic Technology, 2023, 43(2): 93-98.

基于多输入多输出阵列的3D-FDA-SAR成像方法

3D-FDA-SAR imaging method based on multiple-input multiple-output array

  • 摘要: 针对频率分集阵列三维合成孔径雷达(3D -FDA-SAR)成像方法阵元数目多、阵元利用率低的问题,提出一种基于多输入多输出阵列的3D -FDA-SAR成像方法。将3D -FDA-SAR切航迹向的频率分集阵列改为多输入多输出频率分集阵列,多输入多输出频率分集阵列随运动平台运动,在沿航迹向形成综合孔径,结合切航迹向的实阵列,合成虚拟二维频率分集阵列平面,获得对目标的下视三维成像能力。首先建立多输入多输出3D -FDA-SAR成像模型与信号模型,利用多输入多输出技术,在发射端发送波形正交信号单频窄带信号,在接收端通过全频接收方式,接收所有发射阵元经目标反射后的回波信号,经正交匹配滤波器进行信号分离,获得不同收发通道的回波数据,再利用后向投影算法对回波数据进行成像处理,最终获得目标的三维成像结果。仿真结果表明,基于多输入多输出阵列的3D -FDA-SAR成像方法使用少量阵元,提高了阵元利用率,获得了对下视目标的三维成像能力。

     

    Abstract: Aiming at the problem of the large number of array elements and low utilization rate of the three-dimensional synthetic aperture radar (3D -FDA-SAR) imaging method of frequency diversity arrays, a 3D -FDA-SAR imaging method based on multiple input and multiple output arrays is proposed. The frequency diversity array of 3D -FDA-SAR tangent track direction is changed to multiple -input multiple -output frequency diversity array. The multiple input multiple output frequency diversity array moves with the moving platform to form a synthetic aperture along the track direction, combined with the tangent track direction The real array is combined with a virtual two-dimensional frequency diversity array plane to obtain the downward-looking three -dimensional imaging capability of the target. Firstly, a multi-input multi-output 3D -FDA-SAR imaging model and signal model are established, using multi-input multi-output technology, the waveform quadrature signal single-frequency narrowband signal is sent at the transmitting end, and all the transmitting arrays are received through the full-frequency receiving mode at the receiving end. The echo signal reflected by the target is separated by a quadrature matched filter to obtain the echo data of different receiving and sending channels, and then the echo data is imaged by the backward projection algorithm, and finally the three -dimensional imaging result of the target is obtained. Experimental simulation results show that the 3D -FDA-SAR imaging method based on multiple -input multiple -output arrays uses a small number of array elements, improves the utilization of the array elements, and obtains the three -dimensional imaging capability of downward-looking targets.

     

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