CAJ | 학술논문

通过改进合成孔径雷达（SAR）动目标检测（GMTI）的检测方法 DPCA 及 ATI，并对两种方法的效果进行了对比。DPCA 处理步骤为：坐标配准、相位补偿、杂波对消、均值平滑和阈值检测，而 ATI 处理步骤为坐标配准、相位补偿、杂波对消/干涉、均值平滑和阈值检测，除了第三步有所差异外，其余步骤均一样。在此着重改进坐标配准与相位补偿，为提高配准与补偿的精度以提高动目标检测的准确率，并使用亚像素级的频域配准方法。实测数据证明，经改进后的 DPCA 和 ATI 检测效果均良好，即使是强度极弱的动目标也能够被检测到。经对比分析，ATI 在动目标检测上有更优良的性能。创新地使用亚像素级的频域配准方法，且该算法为自动算法，对系统参数精度无要求。
통과개진합성공경뢰체（SAR）동목표검측（GMTI）적검측방법 DPCA 급 ATI，병대량충방법적효과진행료대비。DPCA 처리보취위：좌표배준、상위보상、잡파대소、균치평활화역치검측，이 ATI 처리보취위좌표배준、상위보상、잡파대소/간섭、균치평활화역치검측，제료제삼보유소차이외，기여보취균일양。재차착중개진좌표배준여상위보상，위제고배준여보상적정도이제고동목표검측적준학솔，병사용아상소급적빈역배준방법。실측수거증명，경개진후적 DPCA 화 ATI 검측효과균량호，즉사시강도겁약적동목표야능구피검측도。경대비분석，ATI 재동목표검측상유경우량적성능。창신지사용아상소급적빈역배준방법，차해산법위자동산법，대계통삼수정도무요구。
DPCA and ATI were improved for ground moving target indication(GMTI)of synthetic aperture radar(SAR). Their effects are compared and introduced in this paper. The processing steps of DPCA are coordinate correction,phase compen?sation,clutter cancellation,mean smoothing and threshold detection,and the processing steps of ATI are coordinate correction, phase compensation,clutter cancellation/interference,mean smoothing and threshold detection,which are the same except for the third step. The sub pixel frequency domain registration method was applied to improving the accuracy of coordinate correc?tion and phase compensation so as to raise the precision of GMTI. The experimental results show that the improved DPCA and ATI detection have great detectability,even if the most weak moving target can be detected. It is found by comparison analysis that ATI has better detection efficiency than DPCA on GMTI. The innovation point of this paper is the sub pixel frequency do?main registration method,which is automatic algorithm,and has no requirement to the accuracy of the system parameters.