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Effect of Faraday rotation on polarimetric SAR

机译:法拉第旋转对极化SAR的影响

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摘要

The effect of ionospheric Faraday rotation on polarimetric synthetic aperture radar (SAR) imagery is evaluated theoretically. Faraday rotation is readily included in the polarimetric SAR system equation describing the received signal if the rotation angle is assumed constant over the synthetic aperture length. Deviations from a constant rotation angle over this length impact the validity of the derived system equation, but an explicit evaluation shows such effects to be negligible for most expected ionospheric conditions. The modified system equation provides a basis for calibration techniques that can be used to either remove or measure Faraday rotation effects in SAR imagery
机译:理论上评估了电离层法拉第旋转对极化合成孔径雷达(SAR)图像的影响。如果假设旋转角度在合成孔径长度上恒定,则法拉第旋转很容易包含在描述接收信号的极化SAR系统方程式中。在此长度上偏离恒定旋转角度会影响导出的系统方程的有效性,但显式评估表明,对于大多数预期的电离层条件而言,这种影响可以忽略不计。修改后的系统方程式为校准技术提供了基础,该校准技术可用于消除或测量SAR图像中的法拉第旋转效应

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