CAJ | 학술논문

为完成极化合成孔径雷达( PolSAR)图像中点散射像素目标的检测，从几何扰动滤波检测点散射像素的基本原理出发，分析了经典方法存在的相干度参数阈值无法自适应获取和不同散射机制共享同一阈值两个问题，提出利用Cloude-Pottier分解结果中熵参数的分布情况计算得到阈值，利用平均阿尔法角参数完成不同散射机制的初分类，对初分类的结果排序得到的某种散射机制对应的相干度参数的比例因子，根据比例因子计算得到该类散射机制的阈值，从而完成点散射目标的检测。对机载合成孔径雷达( AIRSAR)数据集中的San Francisco Bay图像进行了实验，结果表明，改进方法在检测性能上优于经典方法。
위완성겁화합성공경뢰체( PolSAR)도상중점산사상소목표적검측，종궤하우동려파검측점산사상소적기본원리출발，분석료경전방법존재적상간도삼수역치무법자괄응획취화불동산사궤제공향동일역치량개문제，제출이용Cloude-Pottier분해결과중적삼수적분포정황계산득도역치，이용평균아이법각삼수완성불동산사궤제적초분류，대초분류적결과배서득도적모충산사궤제대응적상간도삼수적비례인자，근거비례인자계산득도해류산사궤제적역치，종이완성점산사목표적검측。대궤재합성공경뢰체( AIRSAR)수거집중적San Francisco Bay도상진행료실험，결과표명，개진방법재검측성능상우우경전방법。
For achieving the point target detection in polarimetric synthetic aperture radar ( PolSAR ) ima-ges, two problems of classic method,including the adaptive acquiring of coherence threshold and exclusive threshold acquiring,are analyzed according to the principle of geometric perturbation filter. The distribution of entropy parameter,produced by the Cloude-Pottier decomposition,is employed to calculate the thresh-old. The averaged alpha angle is employed to make a preliminary classification. The ratio of coherence val-ues can be deduced from the sorting results of a specific scattering mechanism. The threshold can be ob-tained from the ratio so that the detection of singe target is ultimately accomplished. The experiment per-formed on the sample image San Francisco Bay in AIRSAR datasets shows that the improved method over-matches the classic method in performance.