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首页> 外文期刊>IEEE Transactions on Geoscience and Remote Sensing >Correlating Synthetic Aperture Radar (CoSAR)
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Correlating Synthetic Aperture Radar (CoSAR)

机译：相关合成孔径雷达（CoSAR）

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This paper presents the correlating synthetic aperture radar (CoSAR) technique, a novel radar imaging concept to observe statistical properties of fast decorrelating surfaces. A CoSAR system consists of two radars with a relative motion in the along-track (cross-range) dimension. The spatial autocorrelation function of the scattered signal can be estimated by combining quasi-simultaneously received radar echoes. By virtue of the Van Cittert–Zernike theorem, estimates of this autocorrelation function for different relative positions can be processed by generating images of several properties of the scene, including the normalized radar cross section, Doppler velocities, and surface topography. Aside from the geometric performance, a central aspect of this paper is a theoretical derivation of the radiometric performance of CoSAR. The radiometric quality is proportional to the number of independent samples available for the estimation of the spatial correlation, and to the ratio between the CoSAR azimuth resolution and the real-aperture resolution. A CoSAR mission concept is provided where two geosynchronous radar satellites fly at opposing sides of a quasi-circular trajectory. Such a mission could provide bidaily images of the ocean backscatter, mean Doppler, and surface topography at resolutions on the order of 500 m over wide areas.
机译：本文介绍了相关的合成孔径雷达（CoSAR）技术，这是一种新颖的雷达成像概念，用于观察快速去相关表面的统计特性。一个CoSAR系统由两个雷达组成，这两个雷达在沿航迹（跨范围）方向上具有相对运动。可以通过组合准同时接收的雷达回波来估计散射信号的空间自相关函数。借助Van Cittert–Zernike定理，可以通过生成场景若干属性的图像（包括归一化雷达横截面，多普勒速度和表面形貌）来处理针对不同相对位置的此自相关函数的估计。除了几何性能外，本文的主要方面是CoSAR辐射性能的理论推导。辐射质量与可用于估计空间相关性的独立样本的数量成正比，并且与CoSAR方位角分辨率与实际孔径分辨率之间的比率成正比。提供了CoSAR任务概念，其中两个地球同步雷达卫星在准圆形轨迹的相对两侧飞行。这样的任务可以提供宽广区域内分辨率为500 m左右的海洋反向散射，平均多普勒和表面地形的双向图像。

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