Impact Location Technique Based On Cross-correlation Power Square Migration Imaging

In modern war,it is necessary to carry out accurate strike on the target,and the accurate acquisition of the projectile landing position can provide effective reference information for the precise strike.The rapid and accurate realization of automatic positioning has always been the goal of the field of impact location.At present,most of the conventional impact location methods use the inversion positioning of the arrival time or arrival time of the seismic wave to different detectors.Such methods need to accurately pick up the first arrival time of the wave.In response to the low signal-to-noise ratio of the received data at large range,they will lead to large positioning errors and fail to locate multiple impact point events occurring within a short time.Therefore,this paper carries out related research on this problem,and proposes a power square migration imaging positioning algorithm based on waveform cross-correlation,which can locate multiple impact point events in a short time,and improve the resolution and pickup efficiency while accurately locating the impact point.The main contents of this paper are as follows:(1)The generation process and propagation law of seismic waves after the landing of the projectile are analyzed,and the impact point event is assumed as the ideal point explosion source,and the application of P wave as the basis for the study of impact point location is determined.(2)The principle of conventional impact location method is introduced.In view of its limitations in the face of complex situations such as low signal-to-noise ratio of received data and multiple impact point events,a power migration imaging location algorithm based on waveform cross-correlation is proposed,and the location process is described in detail.(3)The simulation positioning model is constructed by using MATLAB,and the simulation positioning test of multiple impact points is carried out under the 3km×3km twodimensional model and 1km×1km×300m three-dimensional space model,which verifies the feasibility of the positioning algorithm.At the same time,the influence of environmental noise and velocity model error on positioning error is analyzed in the two-dimensional model.(4)The seismic wave signal acquisition system is designed and developed.The multi-point static detonation test was carried out in a small range at the ground range.The imaging results show that the maximum relative error of each core location is 1.66%.Conclusion: In view of the limitations of conventional impact location methods,a power migration imaging impact location algorithm based on waveform cross-correlation is proposed in this paper,and the effectiveness of this algorithm is comprehensively verified by multiimpact simulation tests and actual multi-point static explosion tests.