摘要
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。
The three instantaneous parameters of the Ground Penetrating Radar （GPR） data such as the instantaneous amplitude, instantaneous phase and instantaneous frequency are studied. The instantaneous amplitude contain the buried depth of underground target and the media＇s ability of absorbing the transmitted pulse, and its instantaneous frequency can enhance the late GPR signal and contain the relative values of the relative dielectric constant of adjacent media. On this ba- sis, a conjoint instantaneous parameters analysis method combining the instantaneous amplitude and the normalized instanta- neous frequency is presented to solve the GPR signal preprocessing problems. The experimental results show that the new method has higher resolution and is superior to Hilbert spectrum analysis in target enhancement. It can locate the sampling time point of adjacent media boundaries.
出处
《微波学报》
CSCD
北大核心
2017年第1期16-20,共5页
Journal of Microwaves
基金
中国博士后科学基金(2016LH0016)
国家自然科学基金(11434012
61371186
61362020)
国家自然科学基金国际(地区)合作与交流项目(41561144006)
关键词
探地雷达
瞬时参数分析
目标增强
Hilbert谱分析
ground penetrating radar, instantaneous parameters analysis, target enhancement, Hilbert spectrum analysis
