Research On Minefield Inversion Method Based On Synchronous Detection

Landmines perform well in retarding and interfering enemy movement,especially when a large number of landmines are put into a war,the expected strategic effect can be easily achieved.However,the legacy problems of minefields seriously affect post-war reconstruction and hinder economic development.Therefore,it is an inevitable trend to ensure efficient detection of minefields to promote social development.In view of the above problems,many researchers are committed to the research of advanced minefield detection technology.The existing minefield detection technology is mainly for the detection of single mine target,and lacks the judgment of the overall target of a large range of minefield,which consumes a lot of manpower and material resources to carry out blanket mine-clearing action.Combined with the ground-air coupling synchronous detection system of the minefield,this thesis focuses on the inversion method of the overall target of the minefield.The main contents are as follows:(1)In order to solve the uncertainty of spatio-temporal difference in complex environment,three progressive ground-air coupling synchronous detection methods of qualitative,identification and target determination are adopted to ensure the accuracy of synchronous detection data.(2)In order to improve the accuracy of inversion initial model response data,the space response data of UWB electromagnetic wave in the presence of anomalies were obtained by analyzing the ground-to-air electromagnetic characteristics of the minefield based on FDTD-PML forward simulation.Compared with the linear solution method for nonlinear inversion problems,the proposed method improves the accuracy of response data while ensuring the efficiency of operation.In order to analyze the characteristics of the inversion results,the linear inversion method is used to invert the apparent resistivity parameters,and the results show that the apparent resistivity characteristics can be used as the basis for the discrimination of lightning field.(3)Aiming at the problem of real-time inversion of synchronous detection data of minefield,on the basis of FDTD-PML forward simulation and synchronous detection data pretreatment,a time-sharing and parameter-dividing minefield inversion method based on L-BFGS quasi-Newton method is presented.Simulation results show that the method has good inversion speed and accuracy.It can make reasonable inversion interpretation for synchronous detection data of minefield.(4)The system test was carried out in the minefield detection test field,and the ground-air coupling synchronous detection method and the minefield inversion method proposed in this thesis were tested and verified,and the high-density electrical method was set as the comparative test.The results show that the minefield inversion method can effectively determine the range of the minefield by analyzing the apparent resistivity characteristics.