| In the field of weapon range testing,the spatial positioning information of projectiles serves not only to evaluate the performance of weapons but also to gauge the damage effectiveness of weapon systems.Due to the extremely short time intervals between the firing of projectiles from multi-barrel weapons,the airborne trajectories of the projectiles are similar,with similar speeds and directions.This often leads to the occurrence of multiple projectiles simultaneously reaching the detection plane.Additionally,the mutual occlusion between projectiles poses significant challenges in identifying the spatial positioning information of the projectiles.Therefore,this thesis conducts research on a multi-target spatial positioning testing method,providing a new approach for testing the spatial positioning parameters when multiple projectiles hit the target simultaneously.To address the challenge of testing the spatial positioning of multiple projectiles hitting the target simultaneously,this thesis starts by reviewing the current research status of spatial target positioning methods for both domestic and international contexts.It proposes a spatial target positioning testing method based on the principle of dual-line laser intersection using a three-laser curtain with pairwise combinations.The detection principle of the laser curtain is investigated,and an optoelectronic receiving tube encoding detection array is designed.Based on the spatial geometric structure of the laser curtain,a spatial target positioning solution model is established.To obtain the key parameters of the spatial target positioning solution model,digital filtering algorithms for the optoelectronic receiving tube encoding detection array and an information acquisition system are designed to collect the changing states of the optoelectronic receiving tube encoding.Methods for identifying the center position of the optoelectronic receiving tube encoding detection array are studied to convert the encoding information into the key parameters of the solution model.In response to the occlusion phenomenon during simultaneous targeting of multiple objectives,registration methods for spatial target positioning are investigated.By integrating fuzzy theory with Dempster-Shafer evidence theory,a fusion recognition method for multiple spatial target positions is proposed.An optoelectronic receiving tube encoding information recognition system is designed to visualize various information in the testing system.The sources of errors in the testing system are analyzed,and an error model for spatial target positioning is established using error propagation theory.The distribution of errors for targets in different intervals within the testing area is simulated and analyzed.A comparative experiment was designed with a cardboard target to validate the proposed multi-target spatial position testing method,based on the established spatial target position estimation model and the registration and fusion recognition method for multiple spatial target positions.The test results were compared with the projectile positions obtained from the cardboard target,and the results demonstrate that the proposed method can successfully perform spatial target position testing when multiple projectiles,ranging in diameter from 5mm to 15 mm,simultaneously reach the testing area.Moreover,the testing errors meet the required standards as per the specified indicators.Additionally,the proposed method effectively addresses the challenge of identifying spatial target positions when projectiles occlude each other. |
