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Leveraging 3D models for SAR-based navigation in GPS-denied environments

机译:利用基于GPS拒绝环境的基于SAR的3D模型

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In this paper, we consider use of synthetic aperture radar (SAR) to provide absolute platform position information in scenarios where GPS signals may be degraded, jammed, or spoofed. Two algorithms are presented, and both leverage known 3D ground structure in an area of interest, e.g. provided by LIDAR data, to provide georeferenced position information to airborne SAR platforms. The first approach is based on the wide-aperture layover properties of elevated reflectors, while the second approach is based on correlating backprojected imagery with digital elevation imagery. Building on 3D backprojection, localization solutions result from non-convex optimization problems based on image sharpness or correlation measures. Results using measured GOTCHA data demonstrate localization errors of only a few meters with initial uncertainty regions as large as 16 km~2.
机译:在本文中,我们考虑使用合成孔径雷达(SAR),以在GPS信号可能降级,卡住或欺骗的情况下提供绝对平台位置信息。提出了两个算法,并且在感兴趣区域中利用已知的3D地面结构,例如,由LIDAR数据提供,为机架的SAR平台提供地理位置的位置信息。第一方法基于升高的反射器的宽孔径解覆特性,而第二种方法是基于与数字高度图像相关的反叠图像。基于图像清晰度或相关措施的非凸优化问题,构建在3D背面,本地化解决方案。使用测量的GOTCHA数据的结果展示了只有几米的本地化误差,初始不确定区域大至16公里〜2。

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