为了提高路面的强度和耐用性,一般会在路面下进行钢筋加固,钢筋回波与待检测的灾害目标回波在时空域上可能会产生严重的混叠。为了对灾害目标进行有效的检测与成像,文中提出一种钢筋回波干扰下的灾害目标成像方法。首先,利用快速双曲线曲波变换将雷达接收信号变换到多个不同的尺度空间,在该空间中所有目标的能量是聚集的且相互分离;然后,进行钢筋回波滤波,将灾害目标的回波数据重构到时空域后再变换到波数域,在该域下考虑多层地下介质中电磁波波速变化的特点;最后,再反变换到时空域进行灾害目标成像。文中所提成像方法均采用快速处理算法,提高了运算速度,且适用于多层地下介质中钢筋回波干扰下的灾害目标成像。仿真结果证明了本文所提算法的有效性。

In order to improve the strength and durability of the pavement, rebars are reinforced under the pavement. Rebar echo and disaster target echo might produce serious overlap in the space-time domain. In order to detect and image disaster targets effectively, a method of disaster targets imaging under the suppression of rebars is proposed. Firstly, the radar received signal is projected to different scale space by fast hyperbolic-curvelet transform, and the energy of target echoes is aggregated and separated with each other in all scale space. Then the rebar echoes are filtered in different scale space and inverted into the space-time domain. And the data only contains disaster target is transformed into wave-number domain. Finally, considering the variety of wave velocity in multilayered medium, the data is transformed into space-time domain again for imaging. The imaging method proposed in this paper adopts fast processing algorithm, which improves the operation speed, and it is suitable for disaster target imaging under the suppression of rebar echoes in multi-layer underground media. The simulation results demonstrate the validity of the method proposed in this paper.

TN957.52

国家自然科学基金资助项目;中央高校基本科研业务费项目