临近空间慢速平台SAR地面动目标检测与成像

发布时间：2018-04-05 01:22

本文选题：多普勒滤波　切入点：多普勒调频率估计　出处：《电子科技大学学报》2014年06期

【摘要】：临近空间慢速平台SAR具有生存能力强、持续工作时间长、机动性能好等特点。该文提出了一种临近空间慢速平台SAR地面动目标检测与成像方法。由于平台运动速度较慢,地面静止杂波多普勒展宽较窄,有利于将地面杂波与动目标回波进行分离。首先利用多普勒滤波器实现地面动目标回波与静止杂波的分离,提取出动目标回波;然后将一阶Keystone变换与变分辨多普勒调频率估计方法相结合,在动目标速度未知的情况下完成距离走动校正和距离弯曲校正,解决了动目标回波距离徙动校正难的问题。利用估计出的多普勒调频率设计出方位压缩函数进行方位聚焦,从而完成动目标的检测与成像。该方法不仅适用于地面慢速运动目标,同时也适用于快速运动目标。计算机仿真验证了该方法的有效性。
[Abstract]:The near-space slow-speed platform (SAR) has the advantages of strong survivability, long working time and good maneuverability.In this paper, a method of ground moving target detection and imaging for near space slow moving platform (SAR) is proposed.Because of the slow moving speed of the platform and the narrower Doppler broadening of the ground static clutter, it is advantageous to separate the ground clutter from the moving target echo.First, the Doppler filter is used to separate the ground moving target echo from the stationary clutter, and then the first-order Keystone transform is combined with the variable resolution Doppler frequency estimation method.The range walk correction and range bending correction are completed under the condition of unknown moving target velocity, which solves the problem of range migration correction of moving target echo.The azimuth compression function is designed by using the estimated Doppler frequency to focus azimuth so as to complete the detection and imaging of moving targets.This method is not only suitable for slow moving target, but also suitable for fast moving target.The effectiveness of the method is verified by computer simulation.
【作者单位】：电子科技大学电子工程学院;
【基金】：部级预研基金
【分类号】：TN957.52

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