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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/61177

    Title: 混合式角反射器法於全極化合成孔徑雷達校正;A Hybrid Polarimetric Calibration Technique for SAR Using Corner Reflectors
    Authors: 林書豪;LIN,Shu-Hao
    Contributors: 遙測科技碩士學位學程
    Keywords: 雷達校正;Polarimetric Calibration
    Date: 2013-07-29
    Issue Date: 2013-08-22 12:14:04 (UTC+8)
    Publisher: 國立中央大學
    Abstract:   全偏極合成孔徑雷達(Fully Polarimetric Synthetic Aperture Radar, POLSAR)具全偏極特性,其應用與發展不同於單一波段合成孔徑雷達系統。其最大優勢是採多種極化方式發射與接收,可以獲得目標物的散射矩陣,散射矩陣描述了目標物與電磁波之間複雜的交互作用。矩陣內每一個元素都與電磁波的頻率、極化狀態、物體的形狀與排列方向等因素有關,可知散射矩陣包含了雷達目標物最完整的資訊。
      Fully polarimetric synthetic aperture radar (SAR) has found itself in wide applications for terrain classification, land-use, and physical parameters retrieval, among others. In so inclined, it is required that SAR data be well calibrated both in the relative amplitudes and the relative phases between the polarimetric channels. Polarimetric calibration of a radar image is to correct the polarization distortion, caused by imperfect radar system, in a measured scattering matrix. The distortion as far as polarimetry is concerned is mainly from cross talk between channels and imbalances in the channel gain.
      The proposed calibration method relies only on the characteristics of the calibration targets and requires no assumptions regarding scene statistics and radar characteristics. It allows the correction of polarimetric distortions of the radar system using only three different kinds of calibration target: trihedral, dihedral, the rotated 22.5 degree and 45 degree dihedral. Validation of the proposed method is made by using chamber measurements and real world airborne L-band Pi-SAR data. It is concluded that the amplitude error can be achieved to as small as 0.5dB, while the phase error is about 5 degrees. It is revealed that the rotated the 22.5 degree dihedral is very sensitive to rotation angle and easily causes unacceptable error and hence is not recommended for purpose of polarimetric calibration.
    Appears in Collections:[遙測科技碩士學位學程] 博碩士論文

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