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首页> 外文期刊>International journal of navigation and observation >Multichannel Along-Track Interferometric SAR Systems: Moving Targets Detection and Velocity Estimation
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Multichannel Along-Track Interferometric SAR Systems: Moving Targets Detection and Velocity Estimation

机译：多通道沿轨干涉SAR系统：运动目标检测和速度估计

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摘要

Along-track interferometric synthetic aperture radar (AT-InSAR) systems are used to estimate the radial velocity of targets moving on the ground, starting from the interferometric phases, obtained by the combinations of two complex SAR images acquired by two antennas spatially separated along the platform moving direction. Since the radial velocity estimation obtained from a single-phase interferogram (single-channel) suffers from ambiguities, multichannel AT-InSAR systems using more than one interferogram can be used. In this paper, we first analyze the moving target detection problem, evaluating the systems performance in terms of probability of detection and probability of false alarm obtained with different values of target radial velocity, signal-to-clutter ratio, and clutter-to-thermal noise ratio. Then, we analyze the radial velocity estimation accuracy in terms of Cramer-Rao lower bounds and of mean square error values, obtained by using a maximum likelihood estimation technique. We consider the cases of single-baseline and dual-baseline satellite systems, and we evaluate the detection and estimation performance improvement obtained in the dual-baseline case with respect to the single-baseline one. Sensitivity of the presented method with respect to the involved target and system parameters is also discussed.
机译：沿轨道干涉合成孔径雷达（AT-InSAR）系统用于估计在地面上移动的目标的径向速度，该速度是从干涉相开始的，该干涉相是通过沿天线空间上分开的两个天线获取的两个复杂SAR图像的组合获得的。平台的移动方向。由于从单相干涉图（单通道）获得的径向速度估计存在歧义，因此可以使用使用一个以上干涉图的多通道AT-InSAR系统。在本文中，我们首先分析运动目标的检测问题，并根据目标径向速度，信杂比和杂散热的不同值获得的检测概率和虚警概率评估系统性能。噪声比。然后，我们使用最大似然估计技术，根据Cramer-Rao下界和均方误差值来分析径向速度估计精度。我们考虑了单基线和双基线卫星系统的情况，并且相对于单基线，我们评估了在双基线情况下获得的检测和估计性能的改进。还讨论了所提出方法相对于所涉及的目标和系统参数的敏感性。

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