Abstract
Fragments generated from the blast-fragmentation warhead after blasting are typically multiple, fast, small, and dense. In light of the epipolar multitarget feature of blasting fragments, this paper utilizes the movement characteristics of blasting fragments for modeling. Then, the modeling results are adopted in probabilistic data association (PDA) algorithm of multitarget tracking. A novel epipolar multitarget velocity PDA (VPDA) algorithm is proposed based on the movement characteristics of blasting fragments. This algorithm forms the movement characteristics with the finite element simulation results of warhead blasting fragments, utilizes the Doppler velocity probability to reassign the association probability, and updates the state and covariance of each target through the probability weighted fusion. Simulation results demonstrate that, the computational complexity of the proposed algorithm is close to that of PDA algorithm, and the association success rate and the state value update error approximates to the association effects of joint probabilistic data association (JPDA) algorithm, which can effectively track the fragments with identical velocity while reducing the complexity of the epipolar multitarget tracking algorithm, and can respond to the group target tracking scenario.
Highlights
Fragments generated from the blast-fragmentation warhead after blasting are typically multiple, fast, small, and dense
A novel epipolar multitarget velocity probabilistic data association (PDA) (VPDA) algorithm is proposed based on the movement characteristics of blasting fragments. is algorithm forms the movement characteristics with the finite element simulation results of warhead blasting fragments, utilizes the Doppler velocity probability to reassign the association probability, and updates the state and covariance of each target through the probability weighted fusion
In combination with contents described this paper firstly simulates the warhead fragment dispersion, and verifies the correctness of such simulation model through a certain treatment; in addition, based on the fragment movement characteristics demonstrated by such simulation model, the epipolar multitarget tracking performance is tested for the VPDA algorithm proposed
Summary
Due to the very high costs of warhead blasting test, it is unrealistic to obtain the complete movement characteristics of warhead fragments after the blasting through the true blasting test method. Erefore, this paper simulates the movement process of warhead fragments after the blasting through the finite element simulation technology. Due to the effects of the gravity, the bending occurs to the flight trajectory of the fragment; the velocity attenuation of the fragment is caused by the air resistance. After the remaining velocity equation of the fragment is obtained, the scientific estimate may be made to the movement characteristics of fragment dispersion. Based on the dispersion time and initial velocity of the fragment, it is possible to compute the current remaining velocity of the fragment. According to the computational results, the blasting process of warhead can be simulated with the finite element simulation technology, facilitating the study on the fragment tracking algorithm
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