淺地層探地雷達(dá)回波倒相的自適應(yīng)處理

針對(duì)淺地層探地雷達(dá)目標(biāo)回波相位倒置造成的垂直距離判別不準(zhǔn)的問題，提出了一種探地雷達(dá)對(duì)目標(biāo)回波相位倒置的自動(dòng)識(shí)別、糾正并統(tǒng)一成像的方法。討論了均勻平面波對(duì)理想導(dǎo)體和理想介質(zhì)平面垂直入射情況下，反射平面對(duì)反射波相位的影響。介紹了探地雷達(dá)信號(hào)處理的算法，對(duì)實(shí)測(cè)的成像數(shù)據(jù)進(jìn)行處理，證明了該算法的有效性，提高了淺地層探地雷達(dá)在存在相位倒置情況下的檢測(cè)能力。
關(guān) 鍵 詞 探地雷達(dá); 相位倒置; 自動(dòng)識(shí)別; 加窗倒相; 二維中值濾波

Abstract Aim at the problem that vertical distance cannot be estimated correctly which caused by reflecting signal’s phase invertion, a simple method which can automatically detects phase inversion, corrects it and make a uniform image is putted forward.This paper makes a brief description of the arithmetic of the signal processing for SPR. It also discusses how the reflecting signal’s phase is affected by the reflecting surface, when the uniform planewave touch the perfect metal or dielectric surface. It proves the validity of the arithmetic, when the real data is processed. So SPR’s ability of detection is improved greatly when there is phase invertion.
Key words SPR; phase invertion; auto distinguish; inverse phase in window; 2D medium filtering