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首页> 外文期刊>Geoscience and Remote Sensing Letters, IEEE >A Doppler Ambiguity Tolerated Algorithm for Airborne SAR Ground Moving Target Imaging and Motion Parameters Estimation
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A Doppler Ambiguity Tolerated Algorithm for Airborne SAR Ground Moving Target Imaging and Motion Parameters Estimation

机译：机载SAR地面移动目标成像和运动参数估计的多普勒容错算法

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摘要

This letter proposes an algorithm for airborne synthetic aperture radar (SAR) ground moving target imaging (GMTIm) and motion parameters estimation (MPE), which is applicable in situations whether the Doppler ambiguity occurs or not. To derive the algorithm, the general expression for the received signal after range compression is deduced first, in which the useless exponential term induced by the possible Doppler ambiguity is omitted. Then, the second-order keystone transform (SOKT) is used to correct the range curvature. After the SOKT, the Radon transform is employed to estimate the slope of the target trajectory, and the range walk correction follows. In the following, the scaled Fourier transform and the dechirp technique are utilized to estimate the azimuthal parameters. Finally, the target's motion parameters are obtained by solving equations according to the trajectory slope and the estimated azimuthal parameters, with which the target is focused through azimuth matched filtering. Both simulated and real airborne SAR data are processed to validate the effectiveness of the proposed algorithm.
机译：这封信提出了一种用于机载合成孔径雷达（SAR）地面移动目标成像（GMTIm）和运动参数估计（MPE）的算法，该算法适用于是否发生多普勒模糊性的情况。为了推导该算法，首先推导范围压缩后的接收信号的一般表达式，其中省略了由可能的多普勒模糊性引起的无用的指数项。然后，使用二阶梯形失真校正（SOKT）校正距离曲率。 SOKT之后，采用Radon变换估计目标轨迹的斜率，然后进行距离游动校正。在下文中，缩放的傅立叶变换和去线性技术被用于估计方位角参数。最后，通过根据轨迹斜率和估计的方位角参数求解方程，获得目标的运动参数，并通过方位角匹配滤波对目标进行聚焦。模拟和实际机载SAR数据都经过处理，以验证所提出算法的有效性。

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