摘要
探地雷达应用于铁路路基探测中,其探测记录受天线直耦波、钢轨反射、轨枕绕射波和多次波的严重干扰。利用轨枕干扰响应的时空周期性分布特点,将重采样后的多道记录按一倍或多倍于枕间周期进行平移叠加再平均,形成携带轨枕干扰信号的时空过滤筛;原始记录可通过该过滤筛较好地压制轨枕产生的绕射波和多次波干扰,并同时压制直耦波和钢轨强反射干扰。数值模拟和实测雷达记录时空过滤筛应用效果表明:时空过滤筛算法压制干扰效果明显,可提高雷达记录信噪比和异常分辨能力。
When the ground-penetrating radar （GPR） is used in exploration of railway subgrades, its records are severely interfered in data processing by direct-coupled waves from antennas, strong rail reflection, and diffraction and multiple waves caused by sleepers. Sleeper interference in raw records possesses the feature of spacetime periodic distribution. In this paper, the resampled multiple channels of records are translated, superposed and reaveraged by one time and multiple times of sleeper-to-sleeper periods to from the time space filter screen holding the interference information of sleepers. It is seen that the time space filter screen can be used to well suppress the diffraction and multiple waves caused by sleepers and direct-coupled waves and strong rail reflections can also be suppressed at the same time. Numerical simulation and measured data processing show the time space filter screen algorithm has obvious effects in improving the SNR and resolution capability of abnormalities of the GPR records.
出处
《铁道学报》
EI
CAS
CSCD
北大核心
2013年第5期75-79,共5页
Journal of the China Railway Society
基金
国家高技术研究发展计划(863计划)(2009AA11Z101)
关键词
轨枕干扰
探地雷达
时空过滤筛
绕射波
多次波
interference from sleepers
GPR
time space filter screen
diffraction wave
multiple waves
