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首页> 外文会议>Conference on Image and Signal Processing for Remote Sensing VIII, Sep 24-27, 2002, Agia Pelagia, Crete, Greece >SAR along-track interferometry with application to RADARSAT-2 ground moving target indication
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SAR along-track interferometry with application to RADARSAT-2 ground moving target indication

机译：SAR航迹干涉法在RADARSAT-2地面移动目标指示中的应用

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Canada's RADARSAT-2 (R2) Synthetic Aperture Radar (SAR) satellite will be equipped with an experimental Ground Moving Target Indication (GMTI) mode, which makes use of the "Dual-Receive" capability of the R2 antenna to provide two apertures aligned in the along-track direction. The mode allows two SAR images to be taken under identical geometry of observation, but separated by a short time lag. One of the GMTI techniques, currently being explored, is based on SAR Along-Track Interferometry (SAR-ATI), which uses the magnitude-phase information of the interferogram to extract movers from stationary clutter. In this paper, an unconventional but fully automatic detection scheme, derived using a histogram approximation to the clutter joint Probability Density Function (PDF), is proposed. The new method permits the implementation of a Constant False Alarm Rate (CFAR) detector without the need to derive a theoretical joint PDF for the clutter interferogram. A false alarm reduction technique, based on "selective" local density calculations, is also discussed and implemented, showing striking improvement in the reduction of the number of false alarms (up to 75% reduction) over the original detector without significantly degrading its performance. The detector is shown to be robust in its ability to handle both simulated (R2) and real (airborne) data. Preliminary comparison with a conventional CFAR detector, derived using theoretical marginal PDFs of the interferogram's magnitude and phase, show the performance superiority of the new detector.
机译：加拿大的RADARSAT-2（R2）合成孔径雷达（SAR）卫星将配备实验性地面移动目标指示（GMTI）模式，该模式利用R2天线的“双重接收”功能在两个方向对准两个孔径沿轨道方向。该模式允许在相同的观察几何条件下拍摄两个SAR图像，但间隔很短的时间间隔。目前正在探索的一种GMTI技术是基于SAR沿轨干涉法（SAR-ATI），该技术使用干涉图的幅值相位信息从静止杂波中提取动子。在本文中，提出了一种非常规但全自动的检测方案，该方案使用直方图逼近杂波联合概率密度函数（PDF）。新方法允许实现恒定误报率（CFAR）检测器，而无需导出杂波干涉图的理论联合PDF。还讨论和实现了基于“选择性”局部密度计算的错误警报减少技术，该技术在不显着降低其性能的情况下，与原始检测器相比，在减少错误警报的数量（减少多达75％）方面取得了显着的进步。该检测器在处理模拟（R2）和真实（机载）数据方面具有强大的能力。与常规CFAR探测器的初步比较（使用干涉图幅值和相位的理论边际PDF得出）显示了新探测器的性能优势。

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