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Calibration of Spaceborne CTLR Compact Polarimetric Low-Frequency SAR Using Mixed Radar Calibrators

机译:使用混合雷达校准器校准星载CTLR紧凑型极化低频SAR

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摘要

Spaceborne synthetic aperture radar (SAR) systems operating at lower frequencies, such as P-band, are significantly affected by Faraday rotation (FR) effects. A novel algorithm for calibrating the circular-transmit-and-linear-receive (CTLR) mode spaceborne compact polarimetric SAR using mixed calibrators is proposed, which is able to correct precisely both FR and radar system errors (i.e., channel imbalance and crosstalk). Six sets of mixed calibrators, consisting of both passive calibrators and polarimetric active radar calibrators (PARCs), are investigated. Theoretical analysis and simulations demonstrate that the optimal calibration scheme combines four polarimetric selective mixed calibrators, including two gridded trihedrals and two PARCs, together with total-electron-content measurements by the Global Navigation Satellite System system.
机译:法拉第旋转(FR)效应会严重影响以较低频率(例如P波段)运行的星载合成孔径雷达(SAR)系统。提出了一种使用混合校准器校准圆形发射和线性接收(CTLR)模式的星载紧凑极化SAR的新颖算法,该算法能够精确地校正FR和雷达系统误差(即通道失衡和串扰)。研究了由无源校准器和极化有源雷达校准器(PARC)组成的六套混合校准器。理论分析和仿真表明,最佳校准方案结合了四个极化选择性混合校准器,包括两个网格三面体和两个PARC,以及全球导航卫星系统对总电子含量的测量。

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