舰船电子工程
艦船電子工程
함선전자공정
SHIP ELECTRONIC ENGINEERING
2012年
8期
77-79
,共3页
海杂波%时频分布%目标检测%修正Morlet分布
海雜波%時頻分佈%目標檢測%脩正Morlet分佈
해잡파%시빈분포%목표검측%수정Morlet분포
sea clutter%time-frequency distribution%targets detection%modified Morlet distribution
对海杂波存在目标和没有目标两种情况进行时频分析,其时频分布图表现出明显的特征差异,在没有目标时,时频分布图比较发散,存在目标时,时频分布图中有较集中且与目标多普勒频移对应的最优曲线。利用这种差异,文章提出了基于时频分布的目标检测方法。时频分布检测方法通过查找算法得到该最优曲线,并取该最优曲线所有点的和值作为判断目标存在与否的依据。通过实测数据仿真表明该方法能够提高海杂波环境下目标检测性能。
對海雜波存在目標和沒有目標兩種情況進行時頻分析,其時頻分佈圖錶現齣明顯的特徵差異,在沒有目標時,時頻分佈圖比較髮散,存在目標時,時頻分佈圖中有較集中且與目標多普勒頻移對應的最優麯線。利用這種差異,文章提齣瞭基于時頻分佈的目標檢測方法。時頻分佈檢測方法通過查找算法得到該最優麯線,併取該最優麯線所有點的和值作為判斷目標存在與否的依據。通過實測數據倣真錶明該方法能夠提高海雜波環境下目標檢測性能。
대해잡파존재목표화몰유목표량충정황진행시빈분석,기시빈분포도표현출명현적특정차이,재몰유목표시,시빈분포도비교발산,존재목표시,시빈분포도중유교집중차여목표다보륵빈이대응적최우곡선。이용저충차이,문장제출료기우시빈분포적목표검측방법。시빈분포검측방법통과사조산법득도해최우곡선,병취해최우곡선소유점적화치작위판단목표존재여부적의거。통과실측수거방진표명해방법능구제고해잡파배경하목표검측성능。
This paper presents a small targets detection method based on the difference of time-frequency distribution between sea clutter with or without a target.The key point of this method is searching the optimum curve in time-frequency distribution,i.e.the most possible curve corresponding to the Doppler frequency-shift of a target.First select a start-point,find out the maximum value at a certain frequency range from right or left of this point.Then take the new point as the start-point,find out the next point,until all the point finished,and all points form a curve.After all curves finished,summate all points of every curve and the maximum one is the best curve.Last compare the maximum value against the threshold,if the result is larger,it is a target,otherwise it is clutter.Some numerical tests of real data sets prove that this method can improve the detection performance of a small target in sea clutter obviously.