改进后向投影算法应用于地下目标探测

为了解决地下目标的探测问题,提出了一种基于电四极子辐射模型的地下目标成像算法探测思路。对后向投影算法对地下目标成像的不足进行了定性分析,在综合考虑地下目标成像的有效性及地下目标电磁波传播的时延特性的基础上,通过改进电四极子辐射模型,构建了地下目标成像的数学模型,推导了地下目标电磁波传播的时延补偿计算公式,给出了算法的实现流程。最后,利用MATLAB对所建立的地下目标成像的数学模型进行了计算仿真。仿真结果验证了改进后向投影算法用于地下目标成像的有效性及时延补偿的正确性。将成像算法应用于岩、土体中埋藏的空洞、地雷和城市地下管道的成像,并分析了地面起伏和噪声干扰对成像效果的影响。

Improved Back-projection Algorithm Used in Underground Target Detection

In order to solve the problem of targets detection underground, an imaging algorithm is proposed based on the model of electric quadruple radiation. The lack of back-projection algorithm is analyzed qualitatively, a mathematical model of the underground target imaging, which proceeds from the effectiveness of underground targets imaging and delay characteristics of electromagnetic wave propagation, is built by improving the model of electric quadruple radiation, and the implementation process of the algorithm is given based on the derivation of time-delay compensation formula. MATLAB simulation verifies that the improved back-projection imaging algorithm is effective in detecting target underground and corrective in realizing the time-delay compensation. Then the algorithm is applied to the imaging of holes and landmines hided in the rock soil mass as well as to the urban pipeline underground, the effect of undulating ground and noise to imaging results is also analyzed.