Research On Testing Techniques For Time And Space Parameters Of Proximity Fuze Explosion Point

The proximity fuze projectile is a widely used intelligent ammunition in modern warfare,which greatly exerts the operational performance of weapons.In the development of proximity fuzes,space-time parameters such as the burst point coordinates,miss distance,and flight speed of the projectile are necessary parameters for weapon range testing.The existing measurement methods based on the acoustic principle and the intersection principle of dual sided array cameras have problems such as low measurement accuracy and inability to measure the landing coordinates of unexploded projectiles.The measurement method of projectile burst point based on six light screens combined with flame detection has the advantages of multiple single measurement parameters,and both explosive and unexploded projectiles can be measured.However,the existing six light screens combined with flame detection methods idealize the trajectory into a uniform straight line,resulting in certain measurement errors.In order to solve the above problems,this paper proposes a scheme for measuring the spatiotemporal parameters of proximity fuzes based on the principle of nine light screens array combined with flame detection.A non-uniform curve trajectory measurement model for projectiles subjected to gravity and air resistance is established.The system measurement errors are simulated,analyzed,and simulated with live ammunition experiments.The main research contents of this article are as follows:1)The existing six light screen array combined with flame detection scheme idealizes the trajectory into uniform linear motion,resulting in significant measurement errors.Aiming at the shortcomings of this scheme,a scheme for measuring the space-time parameters of proximity fuze projectiles based on the principle of nine light screen array combined with burst point flame detection is proposed,which can ultimately achieve the measurement of the space-time parameters of nonuniform curvilinear motion proximity fuze projectiles,providing a foundation for subsequent research.2)Based on the proposed nine light screen array combined with burst point flame detection scheme,the effects of gravity and air resistance on the flight trajectory of a projectile during centroid motion flight under standard conditions are analyzed.The plane matrix equations of nine detection light screens in the predetermined trajectory space are derived by capturing the drag acceleration of the projectile during flight through three parallel light screens perpendicular to the predetermined trajectory,The curvilinear motion equation of the simultaneous projectile under the action of gravity and air resistance ultimately established a flight parameter measurement model for non-uniform curvilinear ballistic projectiles.3)Analyzed the effects of target distance and velocity changes on the measurement errors of the uniform velocity linear measurement model and the curve measurement model,simulated the measurement error distribution of the two models,and compared the measurement errors corresponding to the two measurement models.The results showed that the measurement errors corresponding to the curve measurement model were smaller than those of the uniform velocity linear measurement model at different target distances and velocities,and the curve measurement model was more suitable for longer target distances,There is a significant attenuation in the flight speed of the projectile.4)Based on the measurement principle and model of the detection system,an engineering test prototype was designed,and a measurement system using a nine light curtain array combined with burst point flame detection was constructed.A simulated live fire experiment was conducted using a 7mm steel ball.By calculating and analyzing the experimental data and comparing it with the theoretical error simulation results,the experimental measurement error values are basically consistent with the theoretical simulation error values,further verifying the feasibility and accuracy of the established curve measurement model.The proposed method for measuring the space-time parameters of proximity fuze projectiles has the advantages of high measurement accuracy and ease of engineering implementation.It can provide methods and data support for proximity fuze damage assessment and fuze warhead coordination simulation.