Research On Precise Measurement Technology Of Explosion Point Space Position

The detection of target space coordinates has a very important position in the aerospace,unmanned aerial vehicles,military and other fields,and the measurement of the spatial position of the explosion point plays a vital role in the production process of military equipment.For the existing coordinate detection system of the point space,there are problems such as complicated structure,large error,or very expensive cost.Because of the suddenness of the projectile’s explosion and the fact that the firelight lasts only a few milliseconds,Therefore,a higher requirement is put forward for the response sensitivity of the detection system,that is,at the moment of projectile explosion,the camera can complete the capture of the fire light generated by the explosion.Because the center position of the light spot in the image determines the three-dimensional position coordinates of the projectile’s explosive point,because the projectile’s flying speed reaches hundreds of meters per second,the projectile will continue to move forward when it begins to detonate until completely explodes.Therefore,higher requirements are put forward for CMOS camera.It is necessary to be able to clearly capture the light spot generated by projectile explosion,which further increases the cost of the entire system.Therefore,this paper designs a new type of space point coordinate detection system based on ordinary binocular COMS industrial camera,which has the advantages of faster response speed and higher precision.The main process is as follows,the light signal generated by the explosion is detected by the photodiode,after signal processing,the two common industrial cameras are exposed at the same time through the amplitude of the signal,and then perform image processing to obtain the coordinates of the center position of the spot,combined with the relative position relationship between the two cameras,and the three-dimensional position coordinates of the explosion point are finally calculated.The research work of this article mainly includes the following aspects:1.A measurement scheme for the three-dimensional position of the explosion point space based on the synchronous shooting of ordinary binocular CMOS industrial cameras is proposed,which realizes the measurement of instantaneous explosion point space position of high-speed projectile.The theoretical model for measuring the spatial position of the parallel optical axis is studied,and related parameters are calculated for the theoretical model.2.Completed the design and development of the explosion ignition light signal simulation and position calibration device and the detection unit of the transient flash signal under the high light background.Including the design of the photodiode detection unit and the LED calibration target unit,the selection of the camera and LED,which ensures that the camera can respond quickly and obtain the projectile fire light;at the same time,in order to ensure the measurement accuracy,precision auxiliary aiming unit and three-dimensional precision turntable unit are designed.3.An experimental device based on binocular CMOS camera for detecting the spatial coordinates of the explosion point was built,and calibration experiments and position measurement experiments were carried out to verify the accuracy of the system..The noise detection experiment and dynamic measurement experiment of the system were carried out.Under the outdoor conditions,the measurement experiment of using the LED flash device to simulate the explosion point of the shooting range was carried out,The three-dimensional position of the explosion point was measured at 24 m,32m and 48 m away from the detection system.The experimental results show that at 24 m,32m,and 48 m,the maximum error in the X direction is 74 mm,the Y direction is 36 mm,and the Z direction is 80 mm,which meets the accuracy requirements of the system.