基于振动信号的弹丸侵彻土体轨迹测试方法

Test Method of Projectile Penetrator Soil Trajectory Based on Vibration Signal

通过在土体上布设五元阵垂直地震波传感器,利用传感器所测钻地弹侵彻土体后信号的道间相关性,提取相关系数大于0.5信道之间的特征点,提出基于加权方法计算地震波传播速度,然后通过TDOA数学模型,采用Chan算法计算钻地弹在土体中的特征点位置坐标,最后开展火箭橇侵彻土体试验,实测获得钻地弹的运行轨迹,通过验证,在侵彻行程20 m以内的情况下,计算和实测侵彻三维位置均方根误差最大为0.635 m,运行距离相对误差为3.8%,利用此测试方法获得了钻地弹在土体中的运行轨迹,可为钻地弹侵彻土体后的整体回收提供参考。

Aiming at the problem of positioning the penetration position after the ground projectile penetrates the soil,by arranging a five element array vertical seismic wave sensor on the soil,using the inter channel correlation between the signals measured by the sensor,the characteristic points between the channels with a correlation coefficient greater than 0.5 were extracted,and the seismic wave propagation velocity was calculated based on the weighted method.Through the TDOA mathematical model,the Chan algorithm was used to calculate the position coordinates of the characteristic points of the ground penetrating projectile in the soil.The rocket penetration test was carried out,and the running track of the ground penetrating projectile was measured.Through comparison and verification,when the penetration stroke is less than 20m,the maximum root mean square error of the calculated and measured three-dimensional penetration position is 0.635m,and the relative error of the running distance is 3.8%.Using this test method,the trajectory of the ground penetrating projectile in the soil was obtained,which provides a reference basis for the overall recovery of the ground penetrating projectile after penetrating the soil.