雷达科学与技术
雷達科學與技術
뢰체과학여기술
RADAR SCIENCE AND TECHNOLOGY
2014年
2期
149-155,160
,共8页
合成孔径雷达%舰船检测%二维对数正态分布%恒虚警%灰度相关性
閤成孔徑雷達%艦船檢測%二維對數正態分佈%恆虛警%灰度相關性
합성공경뢰체%함선검측%이유대수정태분포%항허경%회도상관성
synthetic aperture radar(SAR)%ship detection%2D joint log-normal distribution%constant false alarm rate(CFAR)%gray correlation
分析了中高分辨率 SAR海洋图像的目标和海杂波特点，利用了 SAR海洋图像中舰船目标的灰度相关性、形状特性以及舰船目标与背景杂波的信杂比特性，提出了一种基于灰度相关性的联合 CFAR舰船检测算法。算法综合利用了舰船目标内部相邻像素间的灰度强相关性和舰船目标和海杂波的信杂比，建立了海杂波区域内相邻像素间灰度值的二维对数正态分布来实现联合 CFAR检测。该算法能够改善斑点噪声和背景局部不均匀对检测带来的虚警，检测效果相比于传统检测算法更加优越。
分析瞭中高分辨率 SAR海洋圖像的目標和海雜波特點，利用瞭 SAR海洋圖像中艦船目標的灰度相關性、形狀特性以及艦船目標與揹景雜波的信雜比特性，提齣瞭一種基于灰度相關性的聯閤 CFAR艦船檢測算法。算法綜閤利用瞭艦船目標內部相鄰像素間的灰度彊相關性和艦船目標和海雜波的信雜比，建立瞭海雜波區域內相鄰像素間灰度值的二維對數正態分佈來實現聯閤 CFAR檢測。該算法能夠改善斑點譟聲和揹景跼部不均勻對檢測帶來的虛警，檢測效果相比于傳統檢測算法更加優越。
분석료중고분변솔 SAR해양도상적목표화해잡파특점，이용료 SAR해양도상중함선목표적회도상관성、형상특성이급함선목표여배경잡파적신잡비특성，제출료일충기우회도상관성적연합 CFAR함선검측산법。산법종합이용료함선목표내부상린상소간적회도강상관성화함선목표화해잡파적신잡비，건립료해잡파구역내상린상소간회도치적이유대수정태분포래실현연합 CFAR검측。해산법능구개선반점조성화배경국부불균균대검측대래적허경，검측효과상비우전통검측산법경가우월。
The characteristic difference between targets and clutter is analyzed.Considering the gray in-tensity distribution of ship target,and its shape difference compared to the clutter,in this paper,a new algo-rithm is presented based on gray correlation.The algorithm utilizes the strong gray intensity correlation in the ship target.Also,the joint gray intensity distribution(JPDF)using 2D joint log-normal distribution of a pixel with neighboring pixels in the clutter is modeled,which can be used for correlation-based joint CFAR detection.Using this algorithm,the false alarms caused by speckle and local background non-homogeneity can be greatly reduced.The detection performance is much better.
