舰船电子工程
艦船電子工程
함선전자공정
Ship Electronic Engineering
2015年
10期
48-50,181
,共4页
距离特征量%LOFAR 谱%图像去噪
距離特徵量%LOFAR 譜%圖像去譟
거리특정량%LOFAR 보%도상거조
distance characteristic feature%LOFAR spectrum%image denoising
浅海波导中目标辐射噪声 LOFAR 谱图存在明暗相间的干涉条纹，从中可以提取出目标距离特征量信息，它反映了目标运动过程中的距离变化率。低信噪比情况下，条纹特征不够清晰，提取的距离特征量值精度会降低。提出了对LOFAR 谱图进行图像处理，使条纹特征更加明显。海试数据处理结果表明，去噪处理后提取出的距离特征量精度明显提高。
淺海波導中目標輻射譟聲 LOFAR 譜圖存在明暗相間的榦涉條紋，從中可以提取齣目標距離特徵量信息，它反映瞭目標運動過程中的距離變化率。低信譟比情況下，條紋特徵不夠清晰，提取的距離特徵量值精度會降低。提齣瞭對LOFAR 譜圖進行圖像處理，使條紋特徵更加明顯。海試數據處理結果錶明，去譟處理後提取齣的距離特徵量精度明顯提高。
천해파도중목표복사조성 LOFAR 보도존재명암상간적간섭조문，종중가이제취출목표거리특정량신식，타반영료목표운동과정중적거리변화솔。저신조비정황하，조문특정불구청석，제취적거리특정량치정도회강저。제출료대LOFAR 보도진행도상처리，사조문특정경가명현。해시수거처리결과표명，거조처리후제취출적거리특정량정도명현제고。
Striations have appeared in plots of Low Frequency Analysis Recording(LOFAR) spectrum in acoustic envi‐ronment of the shallow water .The distance change ratio of target can be described by distance characteristic feature .It can be extracted from LOFAR spectrum striations .Low precision of distance characteristic feature has been obtained because of the low signal to noise ratio and striation pollution .In order to make the striations more clearly ,an image denoising method has been put forward .The ocean experimental results show that the precision of distance characteristic feature is one times higher after LOFAR spectrum image processing .
