研究了低信噪比情况下的星载毫米波顺轨/交轨In-ISAR空间目标三维成像问题.由于传统的RD成像算法在目标尺寸较大和分辨率要求较高时不能取得较好的成像效果,故将波数域成像算法引入运动目标成像处理以获得高分辨率的二维图像,继而将顺轨/交轨三天线ISAR图像分别进行干涉处理,获得了目标上各散射点的三维位置.作为二维成像、图像配准等重要环节的基础参数,对低信噪比下的目标检测和三维运动参数估计进行了研究,分析了速度估计精度要求.最后,仿真结果表明了顺轨/交轨In-ISAR系统的有效性.%The three-dimensional (3-D) images of space targets with spacebome along/cross track millimeter-wave ( MMW) interferometric inverse synthetic aperture radar (In-ISAR) is studied under the condition of low SNR input in this paper. Because the traditional Range-Doppler (RD) algorithm can' t get good performance when the target size is large and required high resolution. The wave number domain imaging algorithm is introduced to obtain two-dimensional (2-D) high resolution images of space moving targets. Then along/cross track interferometric processing is implemented for the three 2-D images obtained from three antennas to determine 3-D positions of the target scattering points. As the foundation of 2-D imaging and image registration, target detection and 3-D velocity estimation at low SNR input are studied here. The requirement for velocity estimation accuracy is analyzed. Finally, numerical experimental results are given to demonstrate the effectiveness of the along/cross track In-SAR system.
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