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通过对探地雷达(GPR)信号的瞬时幅度、瞬时相位和瞬时频率特征进行分析,发现GPR信号的瞬时幅度信息反映了分界面的埋深和各层介质对发射脉冲信号的吸收能力;其瞬时频率信息对晚时信号具有增强作用,并反映了相邻介质介电属性之间的强弱关系。在此基础上,提出了利用瞬时幅度与归一化瞬时频率相乘积的联合瞬时参数方法对GPR信号进行预处理,以提高相邻介质分界面的定位精度。仿真实验和野外实测数据实验结果表明:该方法具有较高的分辨率,能精确地定位相邻介质分界面对应的时刻,其目标增强性能优于Hilbert谱分析方法。
By analyzing the instantaneous amplitude, instantaneous phase and instantaneous frequency characteristics of the GPR signal, it is found that the instantaneous amplitude information of the GPR signal reflects the depth of the interface and the absorptivity of each layer medium to the transmitted pulse signal. The instantaneous The frequency information has an enhancement effect on late signals and reflects the relationship between the dielectric properties of adjacent media. On this basis, a new joint instantaneous parameter method of multiplying instantaneous amplitude with normalized instantaneous frequency is proposed to preprocess the GPR signal to improve the positioning accuracy of the adjacent media interface. The experimental results of field experiments and field experiments show that this method has high resolution and can accurately locate the corresponding moment of the interface between adjacent media, and its target enhancement performance is better than Hilbert spectrum analysis method.