探地雷达目标检测中的离散余弦变换方法

Discrete cosine transform method of target detection for ground penetrating radar

提出了一种以一维离散余弦变换分量作为特征量的探地雷达目标粗略检测方法。首先对探地雷达A-scan信号进行离散余弦变换,而后根据目标与背景处A-scan离散余弦变换最小分量差异较大的特点,引入离散余弦变换最小分量平方作为检测特征量,最后选取特定的阈值进行目标位置的判断,实现目标的粗略检测。实验结果表明,离散余弦变换最小分量作为检测特征量检测定位比较准确,虽然计算时间比能量法长,但精度比能量法高,可以用于目标的粗略检测。

A method of target rough detection for ground penetrating radar was proposed.The one-dimensional discrete cosine transform（DCT） component is used as the feature value to detect the potential target in A-scan signal of ground penetrating radar（GPR）.The minimum DCT components show a large difference between background and target A-scans after one-dimensional discrete cosine transform.According to this idea,the square of minimum DCT components is selected as the feature value in potential target detection.Finally,a specific threshold is selected to determine the position of the target.Test result shows that the method of minimum DCT components has higher precision than the energy method though it spends much time than the energy method,and can be used in GPR target rough detection.