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Zheng C.,Naval Marine Academy | Li G.,Tsinghua University | Li Y.,Naval Marine Academy
2015 IEEE China Summit and International Conference on Signal and Information Processing, ChinaSIP 2015 - Proceedings | Year: 2015

We propose a weighted ℓ2,1 minimization algorithm for retrieving high resolution range profile with the stepped frequency radar. Based on the sliding window technique the raw stepped frequency pulse train is split into subsequences to for-m the jointly sparse signature. By using the Hadamard product of two Pisarenko framework cepstrums a support-related weighting scheme is designed to control the priority class of bases in the reconstruction process so that those bases whose indices are inside the support are likely selected. Experiments on simulated and real data demonstrate that the proposed algorithm performs better range profile reconstruction in comparison with existing homogeneous algorithms. © 2015 IEEE.


Zheng C.,Naval Marine Academy | Li G.,Tsinghua University | Li Y.,Naval Marine Academy
ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings | Year: 2016

Based on the orthogonality between the signal subspace and the noise subspace, we propose a sparse recovery method for the direction of arrival (DOA) estimation. With the assumption of uncorrelated sources, signal covariance matrix fitting is achieved by embedding the MUSIC-like weights into a quadratic minimization, which is capable of prompting the sparsity of the solution. Numerical results show that the proposed method outperforms some other sparse recovery methods. © 2016 IEEE.


Liu Y.,Naval Marine Academy | Xiang D.-Y.,Naval Marine Academy | Zheng C.-D.,Naval Marine Academy
Xi Tong Gong Cheng Yu Dian Zi Ji Shu/Systems Engineering and Electronics | Year: 2016

Strategies of parallel task scheduling have direct influences on the executing time of an application, but the perfect schedule which makes finishing time of the application shortest is a non-polynomial completion time problem. By creating the mathematical models of heterogeneous distributed computing systems (DCS) and static task scheduling, the main procedure and deficiencies of the exist longest dynamic critical path algorithm (LDCP) is carefully analyzed. Further, an improved algorithm with time complexity O(M×N3) to decrease idle time blocks of processors based on the node information flow quantity is proposed. Experiments show that the proposed algorithm outperforms the traditional algorithm and the sorted nodes in leveled directed acyclic graph division algorithm (SNLDD) in the schedule length, speedup and computation efficiency. The schedule length of the improved algorithm is shorter than those of the LDCP and SNLDD algorithms by 19.03% and 8.02%, respectively. The average speedup gained by the improved algorithm is greater than those of the LDCP and SNLDD algorithms by 18.42% and 7.96%, respectively. The computation efficiency of the improved algorithm can get the amount of 10.17% and 3.72% increase than those of the LDCP and SNLDD algorithms. Hence, the proposed algorithm is sure to enhance the coefficient of the utilization for the whole system resources. © 2016, Chinese Institute of Electronics. All right reserved.


Huang X.F.,Naval Marine Academy | Zhu F.,Guangzhou Civil Aviation College | Wei N.,Guangzhou Civil Aviation College
Advanced Materials Research | Year: 2014

Aircraft manufacturing process normally requires very high precision assembly parts which are achieved in practice by a high-precision machining parts followed by a high coordination degree assembly process. The current practice in aircraft parts manufacturing process is that the manufacturing cycle is long, the rework rate is high and the manufacturing precision is difficult to improve. This can be sometimes infeasible or very costly. In this paper, we consider a fit degree calculation method to achieve precision aircraft parts with economical manufacturing processes. We consider an analytical approach to establish a physical process model to guide the design and machining process of assembly parts, which can assume the fit degree. The results show that the approach can obtain the nearly optimal process parameters at designated fit degree. At last, a case is developed to verify the proposed methods. © (2014) Trans Tech Publications, Switzerland.


Huang X.F.,Naval Marine Academy | Zhu F.,Guangzhou Civil Aviation College | Ye B.Y.,Guangzhou Civil Aviation College
Advanced Materials Research | Year: 2014

In a multistage machining process, due to the variation accumulation and interaction between different machining stages, variation analysis and diagnosis for quality-related problems become complicated. In this paper, a fault analysis and prediction method is proposed for connecting engineering design with the activities of process variation sources modeling, dimensional variation analysis, and statistical estimate of variations source. Furthermore, a hypothesis testing method is introduced to determine whether each of potential process faults exists in terms of the statistical significance. At last, an experimental study is provided to illustrate the validity and the significance of the proposed methodology. © (2014) Trans Tech Publications, Switzerland.


Huang B.Y.,Naval Marine Academy | Yang P.,Naval Marine Academy
Control Engineering and Information Systems - Proceedings of the International Conference on Control Engineering and Information System, ICCEIS 2014 | Year: 2015

The traditional hospital information system could be developed into telemedicine system. The information of text, speech, videos must be transmitted. And the speech signal is mix with much of environment noise in the trail telemedicine system, which can greatly restrict the use of the telemedicine system. In order for improving the definition of speech, an adaptive speech enhancer based on autocorrelation is proposed. The frequency of the enhancer and the principle of speech enhancing are analyzed in theory. And a speech enhancer device using the method is designed and implemented. The hardware structure is analyzed. The result from tests demonstrated that the speech signal in the white noise can be enhanced effectively using the method, and performance of the device meet the demand of speech enhancing in the telemedicine system. © 2015 Taylor & Francis Group, London.


Yang P.,Naval Marine Academy | Chen S.H.,Naval Marine Academy
Control Engineering and Information Systems - Proceedings of the International Conference on Control Engineering and Information System, ICCEIS 2014 | Year: 2015

A line-spectrum estimation method of underwater target radiated noise is studied, and the method is based on fourth-order cumulant slice spectrum. The characteristic of fourth-order cumulant slice spectrum is analyzed. Using fourth-order cumulant slice spectrum, the gauss-white noise and symmetry distribution noise can be reduced, and the spectrum structure is similar with power spectrum. The characteristic and calculating process of Lofargram is introduced. The calculating method of fourthorder cumulant slice spectrum diagram is introduced with analyzing the characteristic of Lofargram and fourth-order cumulant slice spectrum diagram. The line in the fourth-order cumulant slice spectrum diagram can be transformed into peak value in the Radon-domain using Radon transform. After the peak value is gained, the frequency and frequency modulation can be calculated. At last, Simulation results show that this algorithm is effective. © 2015 Taylor & Francis Group, London.


Wu Z.-W.,Wuhan Naval University of Engineering | Wu X.-F.,Wuhan Naval University of Engineering | Wu X.-F.,Naval Marine Academy
Zidonghua Xuebao/Acta Automatica Sinica | Year: 2013

A control method for plane-motional host-vessel recovering an autonomous underwater vehicle is proposed based on the idea of states synchronization of master-slave systems. First, the dynamical models of both the host-vessel and the autonomous underwater vehicle are mathematically given, then a master-slave control scheme, in which the autonomous underwater vehicle (slave system) takes over the updated state information of the host-vessel (master system) and manipulates itself to approach to the host-vessel, is established such that the recovery of the autonomous underwater vehicle by the host-vessel can be equivalently studied in synchronization of both the motional states. By means of finite-time stability theory, a sliding mode controller for recovery of the autonomous underwater vehicle by the host-vessel in finite time is designed, where the disturbance of constant ocean current is considered. The validity of the designed controller is verified by means of theoretical proof and numerical simulation. Copyright © 2013 Acta Automatica Sinica. All rights reserved.


Xu S.-L.,Naval Marine Academy
Advanced Materials Research | Year: 2013

A visual simulation system of the high altitude gliding torpedo was researched, and the model was establish accurately. Because the attitude angle of the gliding torpedo changed quickly, and the background parameters were complicated, the problem of rapid change part and separation of the model always was exist, the visual simulation was hard to carried out. The method with combined using DOF and Switch node was proposed. The MATLAB Simulink model was used to calculate the 6 DOF data and save the data through the "To Workspace" module. Then Vega application program was written by VC++ 6.0, with reading the motion parameters and using LOD technology which couldn't reduce the display speed, the simulation visual effect was also improved. Simulation results show that the system can achieve the specific visual simulation functions and performance requirements for high altitude gliding torpedo, the visual simulation t will never be distorted because of rapid change part and separation of the model. © (2013) Trans Tech Publications, Switzerland.


Zhu F.,Guangzhou Civil Aviation College | Huang X.F.,Naval Marine Academy | Ye B.Y.,Guangzhou Civil Aviation College
Advanced Materials Research | Year: 2014

The work in this paper will present a developed methodology for process capability evaluation and improvement in a multistep machining process. In this methodology, a physical model is developed to describe the complex variation propagation process throughout all steps in a multistep machining process. Then building on this physical model, a process capability index evaluation method is derived. A capability improvement procedure is developed to prioritize process improvement efforts based on the sensitivity analysis of process parameters. Finally, the effectiveness of the proposed methodology is demonstrated in a case study. © (2014) Trans Tech Publications, Switzerland.

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