霍夫域极化相干性的雷达影像电力线检测  

Power line extraction from SAR imagery using polarimetric coherence in Hough domain

作　　者：邓少平[1,2] 张继贤[3] 李平湘[2] 冷海芹 

机构地区：[1]中山市基础地理信息中心,广东中山528403 [2]武汉大学测绘遥感信息工程国家重点实验室,武汉430079 [3]中国测绘科学研究院,北京100830

出　　处：《测绘科学》2015年第2期66-71,共6页Science of Surveying and Mapping

基　　金：国家863计划项目(2011AA120401);地理空间信息工程国家测绘地理信息局重点实验室项目(201125)

摘　　要：由于电力线作为一类特殊的线目标,其回波与雷达视角和极化方式密切相关,针对传统的线目标检测方法仅基于回波功率,直接用于电力线检测,由于目标信杂比低,结果虚警率较高的问题以及在极化合成孔径雷达影像中电力线可被看作偶极子,其极化特性明确的特点,该文通过理论分析电力线在影像中的极化特征,提出了一种基于Hough域同极化和交叉极化相干性的恒虚警率电力线自动检测方法,改善了电力线的检测效果。最后使用P波段机载极化SAR真实影像和模拟数据进行实验验证,结果表明此方法优于基于功率的Hough变换和滑动方向窗口估计相干性的检测方法。Power line is a special linear target type,and its radar returns highly depend on the radar incidence and polarization mode.Traditional linear target detectors use power only,which results in high false-alarming rate when detecting power lines due to the low signal to clutter ratio.However,power line can be considered as di-pole in polarimetric SAR imagery with some useful properties.In this paper,after analyzing the polarimetric features of power lines theoretically,an automatic detector with constant-falsealarms-rate properties using the coherence between co-and cross-polarization estimated in the Hough domain was proposed.The P band airborne polarimetric SAR images and simulated data were used to test the new method,and result showed that the method could be better than the method of Hough transform based on power and the method of coherence estimation using moving directional window.

关 键 词：极化 合成孔径雷达 电力线 相干性 HOUGH变换 P波段 

分 类 号：P237.9[天文地球—摄影测量与遥感]