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A Channel Calibration Method Based on Weighted Backprojection Algorithm for Multichannel SAR Imaging

机译:基于加权反投影算法的多通道SAR成像通道标定方法

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摘要

In the multichannel synthetic aperture radar (SAR) systems, unavoidable channel errors will significantly degrade the performance of the ambiguity suppression. To address this problem, a channel phase error estimation method is proposed in this letter. First, the multichannel echo model and the weighted backprojection algorithm are introduced. The channel phase errors are then estimated by maximizing the image intensity using the gradient descent method. The simulation results confirm that the proposed method has higher accuracy and robustness than the orthogonal subspace method. The airborne SAR data acquired by a four-channel strip map C-band airborne SAR system demonstrate the feasibility of the proposed method.
机译:在多通道合成孔径雷达(SAR)系统中,不可避免的通道错误将大大降低歧义抑制的性能。为了解决这个问题,本文提出了一种信道相位误差估计方法。首先,介绍了多通道回波模型和加权反投影算法。然后使用梯度下降法通过最大化图像强度来估算信道相位误差。仿真结果表明,该方法比正交子空间方法具有更高的精度和鲁棒性。四通道带状图C波段机载SAR系统获取的机载SAR数据证明了该方法的可行性。

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