| The mine is a kind of conventional defense weapon used in military.Because of its low cost and remarkable effect,it is widely used in wartime and plays an important role in modern war.Mine is the core of minefield and the target of Minefield Detection.However,although it is easy to lay mines,it is difficult to clear them.After the war,the mines and other explosives that have not been cleared in the minefield area seriously threaten the lives of the local people and hinder the recovery of the battlefield area.Ultra wideband（UWB）pulsed electromagnetic wave detection technology is a technical method using broadband high frequency pulsed electromagnetic wave to detect underground media and buried material information.As a noncontact non-destructive detection method,it has been widely concerned in Minefield Detection.In the practice of international humanitarian mine clearance,UWB pulse electromagnetic wave detection technology plays an important role.The work in this paper is to take the detection of minefield area by UWB pulse electromagnetic wave detection technology.By reading a lot of papers,combined with the propagation characteristics of UWB electromagnetic pulse in underground media,constructs the minefield model and simulates the detection data form of UWB electromagnetic pulse after passing through the minefield model,focusing on the minefield detection system and method based on UWB electromagnetic pulse,the preprocessing of detection echo signal,and the detection of minefield.The main contents include:（1）Taking the physical properties of minefield as the object,the composition and dielectric properties of minefield materials are analyzed.Based on the principle of finite difference time domain（FDTD）,the minefield simulation model is established by using gprmax software,and the Minefield Detection Simulation Based on UWB electromagnetic pulse is carried out.（2）By analyzing the propagation characteristics of UWB electromagnetic pulse in minefield medium,the Minefield Detection System Based on UWB electromagnetic pulse is designed,and the detection method based on the detection system is studied.The UAV formation equipped with UWB electromagnetic pulse detection system realizes the safe and efficient detection of minefield.（3）On the basis of analyzing the data form of UWB electromagnetic pulse echo signal,this paper summarizes the different characteristics of the detection echo signal between the unexploded mine and its surrounding soil due to the difference of dielectric properties,and puts forward the method of minefield discrimination based on the energy statistics of detection echo signal.（4）The mine detection test based on UWB electromagnetic pulse is carried out in the mine detection test field of the school by using the UAV mine detection system.The actual detection results show that the mine detection system designed in this paper and the proposed mine identification method can realize the safe and efficient detection and accurate identification of mine field.Based on the analysis of the propagation characteristics of UWB electromagnetic pulse and the construction of the simulation model of minefield,the paper designs a minefield detection system based on UWB electromagnetic pulse.A method of minefield discrimination based on the energy statistics of detection echo signal is proposed.The UWB pulse electromagnetic wave minefield detection test is carried out on the minefield Laboratory of North University of science and technology of Hunan University of science and technology by using UAV Minefield Detection System,The method and system have good detection and discrimination effect on shallow minefield,and have high efficiency and recognition speed. |
