We have developed a polarimetric Ground Based-SAR system with a compact VNA (Vector Network Analyzer) and a box type Vivaldi antenna array composed of four Vivaldi antennas. This system can be used not only to examine a scattering property of any target, but also to monitor vegetation or a landslide. In a full polarimetric measurement, systematic errors caused by a transmitter and a receiver antenna results in distortion of a scattering matrix. Therefore we need a full polarimetric calibration in order to acquire the correct scattering matrix.
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