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Wuhan, China

Xiao S.,Group of Graduate Management | Li Z.-H.,Group of Graduate Management | Tan X.-S.,AFEWA | Wang H.,AFEWA
Dandao Xuebao/Journal of Ballistics | Year: 2013

The traditional tracking algorithms can not track near-space hypersonic-vehicle (NSHV) effectively. Aiming at this problem, one kind of variable-structure multiple-model tracking algorithm (DG-VSMM) based on the directed graph was proposed. The problem that the model set of traditional variable structure multiple-model algorithm (VSMM) can not quickly jump was analyzed, and the acceleration and angular velocity were selected as the model parameters, and the directed graph of model was built. According to the target maneuver situation, the model subset having a hand in the calculation was chosen, and the local model subset was adjusted for real-time based on the posterior probability of model to realize variable-structure multiple-model tracking. The Monte-Carlo simulation results show that this method can realize the quick jump among model subsets, and the tracking precision, stability and computation are improved, and it can be applied in near-space hypersonic-vehicle tracking. Source


Zhan L.,AFEWA
IET Conference Publications | Year: 2013

Range walk of the fourth generation fighters echo for traditional radar signal processing is a serious problem in the long coherent integration time. To solve the problem, a novel coherent Radon transform based weak target detection algorithm for metric-band phased array radar is proposed. First the echo signal model of supersonic weak target is provided, and the characteristic of range walk is analyzed. Based on this, the coherent Radon transform based long term coherent integration algorithm along the range walk line is presented. Finally, the performance of target detection and parameter estimation of the algorithm are analyzed by the simulation experiments, which suggest that the proposed algorithm has better detection performance compared with Hough transform method and MTD method. Source


Zhang Y.,AFEWA | Huang X.,AFEWA
2013 IEEE 3rd International Conference on Information Science and Technology, ICIST 2013 | Year: 2013

It is a difficult problem to denoise the function optical imaging datum under low Signal Noise Ratio (SNR). The traditional method is filtering denoising. As the noise is wide-band, there remains strong noise in the filtering signal. To resolve this problem, the signal and the noise are regarded as different independent sources, and the independent component analysis (ICA) method is used to separate these independent sources. With the prior information of the signal, we can extract it from the independent sources, so the noise can be sharply reduced. The simulation results show that the ICA denoising performance is obviously superior to the filtering under low SNR. © 2013 IEEE. Source


Zhai Q.,AFEWA | Li Y.,AFEWA
Applied Mechanics and Materials | Year: 2014

With the development of computer technology, programmable logic controller (PLC) is becoming more powerful and more convenient to be used. However, if the working condition of PLC is too harsh, such as high temperature, humidity, vibration, strong shock and electromagnetic interference, it will directly affect the normal, safe and reliable operation of the whole automatic control system. And coupled with the ineffective peripheral circuit interference measures, it greatly reduced the reliability of the automatic control system and even leads to failure. Therefore, the design of industrial PLC automatic control system must give top priority to the reliability of the hardware and software aspects. This paper introduces the concept and existing research of PLC –based automatic control system, and discusses about the specific design studies from both hardware and software aspects. © (2014) Trans Tech Publications, Switzerland. Source


Liu S.H.,AFEWA | Hu Z.M.,Huangpi Noncommissioned Officer Academy | Tang Y.W.,Unit 94878
Applied Mechanics and Materials | Year: 2013

The principle of imaging method based on matched filtering and chaos theory are introduced. On this basis, a new method of range imaging using the correlation function of the chaotic signal is provided. At the same time, simulation models and simulation results are given. The experiment results show this method has the advantages of good range resolution and excellent anti-interference performance, the quality of the reconstruction image is fine. © (2013) Trans Tech Publications, Switzerland. Source

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