A Study On The Methods Of Impact Point Location Based On Energy Attenuation

The pinpoint of impact point shows great importance in the range test and practical training with the increasing improvement of modern weapons' target accuracy.So far,the positioning of impact point in the range has been manually operated.However,the manual work is low in efficiency and exists certain security risk.Thus,through a comprehensive consideration of infrared positioning,GPS positioning and microseismic inversion location method,this thesis focuses on the attenuation law of the energy generated after projectile landing,analyzing the pinpoint of impact point with the combination of numerical simulation and experimental test.Firstly,the author studies the forward modeling process,making a forward simulation of wave signals based on the wave equation,visually displaying the propagation process of wave signals in different media and the attenuation process of energy.Meanwhile,it offers simulation data for the inversion positioning of impact point.The positioning accuracy of impact point mainly relies on the extracted precision of signal feature points and the positioning method.The former is the basis of precise target positioning while the latter is critical to achieve precise positioning.Then,through pre-processing the data collected by the sensor with wavelet denoising method,it concludes that the rigrsure threshold does well in de-noising for signals.Next,the author treats the initial arrival time of signals as feature points,extracting the initial signals after denoising with the AIC method,STA/LTA method and PAI-S/K method.After theoretical analysis and experimental test,it indicates that those methods can accurately pick up signal feature points,guaranteeing the pinpoint of impact point.Lastly,the differences between the conventional linear positioning method and intelligent method are studied in inversion positioning.Through the numerical simulation and experimental test,it shows that the accurate extraction of signal initial arrival time can effectively locate the projectile.Meanwhile,the new objective function proposed in this thesis can be widely applied in engineering through verification.