浅地层探地雷达回波倒相的自适应处理

针对浅地层探地雷达目标回波相位倒置造成的垂直距离判别不准的问题，提出了一种探地雷达对目标回波相位倒置的自动识别、纠正并统一成像的方法。讨论了均匀平面波对理想导体和理想介质平面垂直入射情况下，反射平面对反射波相位的影响。介绍了探地雷达信号处理的算法，对实测的成像数据进行处理，证明了该算法的有效性，提高了浅地层探地雷达在存在相位倒置情况下的检测能力。
关 键 词 探地雷达; 相位倒置; 自动识别; 加窗倒相; 二维中值滤波

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