纵波的提取及其在地面振动目标探测中的应用

The Extraction of Primary Wave and its Application in Target Detecting on the Ground

目标振动时会产生多种信号及噪声,为保证研究数据的一致性和有效性,基于纵波自身频率的特点以及小波包滤波对信号更有效的时频分析特性,结合Matlab和Labview平台对实验数据进行小波包滤波处理,提取出纵波。二维平面距离定位法可以在已知三个传感器坐标位置以及传感器到振动目标的距离的情况下计算出振动目标的坐标位置。为得到距离数据,对纵波的峰峰值与传感器到振动目标的距离的关系进行了研究,提出两者关系式。定位精度均方根误差为3.7138。

The virbrating target will generate kinds of signals and noises. In order to ensure the consistency and validity of research data, the primary wave is extracted based on the fre- quency. Matlab and Labview are used jointly to process the experimental data. The signal process method is wave packet filter technique as its more effective time-frequency analysis property. Distance positioning method of two-dimensional planes can calculate the target＇s coordinates when we know three sensors＇ coordinates and each sensor-to-source distance of them. To get distances data, the relationship between pick-to-pick value of primary wave and the distance from sensor to source is researched. As a result, the relationship is pro- posed. The position accuracy is 3.7138 expressed in the root of mean square error.