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A Robust Radial Velocity Estimation Method for FDA-SAR

机译:FDA-SAR的鲁棒径向速度估计方法

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摘要

In multi-channel synthetic aperture radar-ground moving target indication (SAR-GMTI), most radial velocity estimation methods are based on the phase difference between channels. However, the image coregistration and channel phase errors will have a severe impact on the phase difference between channels. Moreover, it deteriorates the performance of the moving target radial velocity estimation. To solve this problem, a robust radial velocity estimation method is proposed using a frequency diverse array-SAR (FDA-SAR) in this letter. By introducing the step frequency, the interferometric phase among channels is a linear function of the Doppler frequency. The radial velocity of moving targets is embedded in the first-order term of the linear function. Meanwhile, the first-order term does not include channel phase error terms. Therefore, the accurate velocity of moving targets is estimated by the first-order coefficient which is solved by the least-squares fitting method. Afterward, according to the analysis and derivation, the proposed method is robust on the condition of image coregistration error. At last, simulations and data analysis illustrate the effectiveness of the proposed method.
机译:在多通道合成孔径雷达接地移动目标指示(SAR-GMTI)中,大多数径向速度估计方法基于通道之间的相位差。然而,图像核心专用和信道相位误差将对信道之间的相位差产生严重影响。此外,它劣化了移动目标径向速度估计的性能。为了解决该问题,使用本字母中的频率各种阵列-SAR(FDA-SAR)提出了一种强大的径向速度估计方法。通过引入阶梯频率,通道之间的干涉阶段是多普勒频率的线性函数。移动目标的径向速度嵌入线性函数的一阶项。同时,一阶项不包括信道相位误差术语。因此,通过最小二乘拟合方法解决的一阶系数估计移动目标的精确速度。之后,根据分析和推导,所提出的方法对图像核心转速误差的条件是鲁棒的。最后,仿真和数据分析说明了所提出的方法的有效性。

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