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Sources of dispersions that contribute to delivery error and reduce the soldier performance in terms of hit probability are numerous. In order to improve the warfighter performance, the source of the errors contributing to the inaccuracy and dispersion of the weapon systems must be understood. They include ammunition dispersion error, gun dispersio...
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... box. This system provided 50 frames pre and post trigger as well as the time "0" or trigger time in order to determine the aiming error. The frame rate of the camera was set at 230 fps. An Endevco microphone EM46BD mounted on a tripod was used. The trigger box was custom made in-house. A representation of the experimental setup is shown in Fig. ...
Citations
... The latest research methods on missile hit accuracy estimation mainly include Bayesian method, numerical analysis method, Monte Carlo simulation method, deep learning method, etc. [3][4][5][6]. Li et al. [7] took the phenomenon that anti-cruise missile projectile dispersion obeyed the two-dimensional normal distribution as the starting point, selected normal-inverse gamma distribution as the prior distribution of projectile dispersion parameters based on Bayesian method, and the posterior distribution was solved. Finally, the hit accuracy of anti-cruise missile was estimated. ...
During the period of research and design of new missiles, the hit accuracy tests are usually carried out in multiple stages according to the task progress and results. The existing estimation methods seldom consider the tests characteristics of multiple stages growth of missile hit accuracy, which bring difficulties to accurately estimate the missile hit accuracy. Considering the different degrees of damage caused by missile hitting the target in different areas, the Dirichlet distribution is selected as the prior distribution of missile hit accuracy parameters based on the Bayesian method. The sequence constraint relationship between the missile hit accuracy parameters of each stage test is established, and the Bayesian estimation model of missile hit accuracy based on the multiple stages growth tests is constructed. The Markov Chain-Monte Carlo (MCMC) method combined with Gibbs sampling are used to overcome the problem of solving the posterior high-dimensional integral of the model, and the finally estimation of missile hit accuracy is completed. The example shows that compared with the existing single stage test method, this method can consider the tests characteristics of multiple stages growth of missile hit accuracy and integrate the test information of each stage, which can provide reference for the estimation of missile hit accuracy during the period of research and development.
... The second stage, the fine-tuning portion, becomes the critical aiming window identified from the movement's reduced magnitude and velocity. The third stage, the final position after pulling the trigger, represents the received effects of the recoil process consisting of sudden movements [4][5] . ...
The accuracy level is important in shooting activities and depends on many factors, such as hand tremors as body vibration and shooting position. Achieving high accuracy in different shooters is challenging, especially in the case of different shooting positions. However, there is a lack of information about the influence of shooting positions and experiences on a shooter’s body vibration and accuracy levels. Thus, this study aims to develop a portable and low-cost hand tremor measurement device (as a function of body vibration) to identify the influence of hand movement on shooting accuracy. For this purpose, low-cost accelerometer sensors and a microcontroller were used as the measurement kit. Three different shooting positions (squatting, standing, and prone) were analyzed. The shooters were classified into novice and expert groups. Each group had five participants with standard fire guns and accelerometer kits. These participants were asked to shoot the target to get their best accuracy. Besides, the hand tremor level data from the self-developed kit were recorded to investigate the hand tremors. The results show that the novice participants have more hand tremors in all shooting positions. There are significant differences between the squatting, standing, and prone positions in hand tremors for novice and expert participants. In the expert group, the prone and squatting positions have the least vibration level, indicated by the least acceleration (0.01 - 0.04 m/s2 for the expert group and 0.02 - 0.11 m/s2 for the novice group). The best accuracy for all positions is also obtained from expert shooters. It can be concluded that different shooting positions are related to the body vibrations. The expert shooters have a lower body vibration than the novice participants. The hand tremor levels may influence the accuracy level since different shooting positions and experiences have different vibration and accuracy levels
... The procedure was executed until the participant's aim was off the target (the laser point was in the white area for more than 0.5 seconds). There was no actual firing in this study [8]. The target and evaluation procedure are presented in Fig.2. ...
As the switch for the start-up of the nozzle at the rear of the recoilless gun, the opening pressure of the blocking sheet directly affects the balance of the recoilless gun during the shooting process. The opening time of the blocking sheet is obtained through high-speed camera by capturing the tail flame. Using piezoelectric pressure sensors, the pressure at different positions along the barrel were measured. Furthermore, the pressure at the moment of opening the blocking sheet was determined based on its opening time. A significant force jump (Δ f = 146.9 kN) in the unbalanced recoil experienced by the recoilless gun during the initial firing stage was identified based on the theory of one-dimensional recoilless gun balanced interior ballistics. This jump arises from the opening pressure of the blocking sheet surpassing the projectile's starting pressure ( P 0 ). This research can provide a reference for the design of recoilless weapons related to unbalanced force.
