声波探雷及其信号处理方法

Acoustic landmine detection and its signal processing method

为了研究声波探雷机理,设计一个基于声-地震耦合的实验系统,并用曲线拟合的方法研究了复杂的测试信号变化规律。简述了声-地震耦合基本原理,分析了土壤-地雷系统的共振作用;然后,分别用扬声器和地震检波器串激发和接收地表振动;最后,采用平均值算法进行地表振动速度曲线拟合,并解释实验现象。结果显示,有地雷的地表振动速度与无雷的比值在很宽的频带内都>1,其峰值达24。表明地雷能引起地表振动的明显变化,所提出的实验系统及曲线拟合方法可用于声波探雷信号的进一步研究。

In order to investigate the mechanism of acoustic landmines detection, an acoustic-to-seismic coupling based experimental system was developed, and a curve-fitting method was adopted to study the measured complex signals. Acoustic-to-seismic coupling theory was briefly described, and the resonance mechanism of soil-mine system was analyzed. Then, a loudspeaker and a geophone array were employed to induce and receive the ground vibration respectively. Finally, an average algorithm was used to fit the curves of ground vibration velocity and to explain experimental phenomenon. Experimental results indicate that the ratio of ground vibration velocity on-to-off mine is greater than 1 in wide frequency range and up to 24 in peak frequency. It proves that landmines can induce the distinct changes of ground vibration, and proposed experimental system and curve-fitting method are applicable for further study of acoustic landmines detection signals.