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Research on high-precision passive localization based on phase difference changing rate

CONCURRENCY AND COMPUTATION-PRACTICE & EXPERIENCE 2019年第23期31卷

作者： Zhou, Taoyun Cheng, Yun Lian, Baowang Irfana, Bibi Zhao, Hongwei Northwestern Polytech Univ Sch Elect & Informat Xian Shaanxi Peoples R China Hunan Univ Humanities Sci & Technol Sch Informat Loudi 417000 Peoples R China Xidian Univ Sch Comp Sci & Technol Xian Shaanxi Peoples R China

Passive localization method has a wider applicable prospect as a rising localization resort with well flexibility. The acquisition of phase difference changing rate is a very practical problem in passive localization for the way how to get the phase difference, and a better error precision directly affects the accuracy of the localization. Firstly, based on the analysis of the positioning principle of phase difference changing rate, it studies the characteristics of phase difference changing rate and proposes a novel resolving phase ambiguity algorithm based on a double baselines system cosine theorem (DBSCT), which can eliminate the phase difference ambiguity efficiently. Secondly, it studies two typical methods to extract the high-precision phase difference changing rate from the unambiguity phase difference, namely, difference algorithm and Kalman algorithm. Finally, it compares the Kalman algorithm with the difference algorithm through computer simulation. Simulation results show that the Kalman algorithm can efficiently smoothen the phase difference data and suppress the measurement noise to achieve a high positioning accuracy. Simulation results also show that with a certain phase difference measurement accuracy, the phase difference rate accuracy extracted by the Kalman algorithm is higher than that we require. Therefore, we can appropriately relax the phase difference measurement accuracy requirements to achieve the same positioning accuracy. So, it has a great application value.

关键词： ambiguity of phase difference difference algorithm Kalman algorithm passive localization phase difference changing rate

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Modelling the Azov Sea circulation and extreme surges in 2013-2014 using the regularized shallow water equations

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RUSSIAN JOURNAL OF NUMERICAL ANALYSIS AND MATHEMATICAL MODELLING 2018年第3期33卷 173-185页

作者： Saburin, Dmitry S. Elizarova, Tatiana G. Moscow MV Lomonosov State Univ Chair Math Leninskie Gory 1Bld 1 Moscow 119991 Russia RAS MV Keldysh Inst Appl Math Miusskaya Sq 4 Moscow 125047 Russia

A new model for calculation of circulation in shallow water basins is created based on the shallow water equations taking into account the Coriolis force and quadratic friction on the bottom. Wind effects are taken into account as forcing. The main feature of the model is a new numerical method based on regularized shallow water equations allowing one to construct the simple and sufficiently accurate numerical algorithms possessing a number of advantages over existing methods. The paper provides a detailed description of all construction steps of the model. The developed model was implemented for the water area of the Azov Sea. The paper presents the modelling of extreme surges in March 2013 and September 2014, the results of calculations are compared with observation data of hydrometeorological stations in Taganrog and Yeysk.

关键词： Regularized shallow-water equations difference algorithm extreme surges Azov Sea

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Thickness Optimization of Multi-layer High Temperature Clothing

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电脑学刊 2019年第4期30卷 193-205页

作者： Jianchi Sun Kang Zhou Wanying Liang Huadi Wu Shiyu Jia Chengyong Huang Jin Gao

The design problem of multi-layer high-temperature clothing is based on the numerical solution of partial differential equation. Based on the solution of the problem, it is obtained that the temperature satisfies the law of heat conduction equation in the same layer transfer, the temperature and thermal density continuity conditions are considered at the critical point of the layer and layer. In this paper, the mathematical model of partial differential equation of multilayer heat conduction is established for simulation experiment. The mathematical model of dual objective optimization is established to solve the optimum thickness of a certain layer, and the difference algorithm of partial differential equation is designed. The boundary condition is obtained by the constraint condition in the solution of the optimal thickness. The optimal solution is obtained by traversing the thickness of the simulation experiment. In addition, the temperature distribution of each layer is simulated in detail. In order to find out whether a certain thickness satisfies the fact law of temperature change, this paper takes the average difference of layer II in data simulation experiment as the criterion to judge whether it conforms to the actual situation. Thus the index of this judgment can be quantified. In the traversal search, the average difference of each thickness is calculated, and the optimum thickness is selected. In the dual objective mathematical model, the control variable method is used to solve the average difference between the thickness of the fourth layer and the thickness of the second layer, from which the Pareto solution set is found and the optimal solution is selected from the Pareto solution set.

关键词： multi-layer high temperature heat conduction thermal density continuity partial differential equation difference algorithm multi-objective optimization

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Application of the regularized shallow water equations for numerical simulation of seiche level oscillations in the Sea of Azov

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Mathematical Models and Computer Simulations 2017年第4期9卷 423-436页

作者： Elizarova, T.G. Saburin, D.S. Keldysh Institute of Applied Mathematics Russian Academy of Sciences Moscow Russian Federation Faculty of Physics Moscow State University Moscow Russian Federation

A mathematical model for calculating the currents in the sea area scale was developed for the first time within an algorithm of regularized shallow water equations. The model and the numerical algorithm are described as applied to the topology and natural features of the Sea of Azov. The results of the calculations of hydrodynamic currents in the Sea of Azov in the presence of typical seiche waves caused by tidal or wind influences are presented. © 2017, Pleiades Publishing, Ltd.

关键词： difference algorithm regularized shallow water equations seiche waves the Sea of Azov

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A Modified Implicit Iterative difference algorithm for Stiff Chemical Kinetic Equations in Complex Combustion System

A Modified Implicit Iterative Difference Algorithm for Stiff...

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International Conference on Advanced Engineering Materials and Technology (AEMT2011)

作者： He, Bo Nie, WanSheng Feng, SongJiang Li, GuoQiang Co Postgrad Management Acad Equipment Command & T 98 POB 3380 Huairou Beijing 101416 Peoples R China Dept Space Equip Acad Equip Command & Technol Beijing 101416 Peoples R China

ISBN: (纸本)9783037851944

The splitting-operator method has been widely used in the numerical simulation of complex combustion system with its high computation efficiency. The main difficult encountered in the method is how to integrate the stiff chemical kinetics ordinary differential equation (ODE) efficiently and accurately in each grid node of flow field. Although several ODE software packages such as LSODE and VODE have very predominant performance in integrating stiff and non-stiff case, it couldn't ensure the positivity of mass fraction in integrating stiff chemical kinetic ODE. A detail liquid rocket hypergolic bipropellant combination of Monomethylhydrazine (MMH)/Red Fuming Nitric Acid (RFNA) chemical mechanism consisting of 550 elementary reactions among 83 species was constituted basing on several relevant literatures firstly. And then a modified implicit iterative difference algorithm with variable time steps was developed to tackle the problem of mass fraction non-positive. The results from the integration of MMH /nitrogen tetroxide (NTO) chemical kinetic ODE indicate that the algorithm is always retain stability and positive value of mass fraction. The time step length would also be automatically adjusted at different chemical reaction time in the algorithm to keep its computational efficiency.

关键词： Splitting-Operator method Stiff ordinary difference equation Chemical kinetics Positivity difference algorithm

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Study on difference algorithm used in missile radiator real-time tracking

Study on difference algorithm used in missile radiator real-...

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Measurement Touch the World——IEEE 2011 10th International Conference on Electronic Measurement & Instruments(ICEMI’2011)

作者： Xu Zhenhui Yang Xi Jia Yongqian(1 Department of Arms Engineering,Academy of Armored Force Engineering,Beijing,China 2 Military Representation Office of 528 Factory,Nanjing 210006 China)

Due to the bad effect of tracking missile radiator and the problem of the unideal initial position and the severe occlusion based on Mean-Shift algorithm,it presents a new algorithm named difference algorithm that uses Kalman filter predicting and Mean-Shift *** to the new difference algorithm method,predicting tracking overall scheme of missile radiator has been proposed and Kalman wave filter has been constructed by using trajectory character of missile *** software is utilized to write the procedure to prove the new *** research result shows that by using difference algorithm,it realizes accurate predict of missile radiator in the next frame *** only the real-time character but also the accuracy character can be improved *** the continual tracking problem of missile radiator after shortly sheltered or missing can be solved effectively.

关键词： missile radiator Mean-Shift algorithm Kalman filtering difference algorithm

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A Real Time Tracking algorithm Basing on Mixed difference algorithm

A Real Time Tracking Algorithm Basing on Mixed Difference Al...

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International Conference on Advanced Measurement and Test (AMT 2010)

作者： Wang, Aixia Wu, Peng Li, Jingjiao Yan, Aiyun Northeastern Univ Coll Informat Sci & Engn Shenyang 110004 Peoples R China

ISBN: (纸本)9780878492695

This paper presented a high real time target tracking algorithm mixed difference tracking algorithm MDT. In the proposed algorithm, frame difference and background difference algorithms are combined to get the location of the target. With background difference algorithm the shape of the target can be extracted. Due to the affection of the dynamic background, single background difference algorithm can not get the location of the moving target. To solve this issue the frame difference algorithm is used to estimate the location, and then combine the results of the background difference algorithm and the frame difference algorithm the location and the size of the target can be extracted. And then filtering algorithm is used to remove noise and isolated points. In the experiment it can be seen that the proposed algorithm can tracking object precisely in real time.

关键词： target tracking real time tracking difference algorithm

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Research of Resource Allocation in Cloud Computing Based on Improved Dual Bee Colony algorithm

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INTERNATIONAL JOURNAL OF GRID AND DISTRIBUTED COMPUTING 2015年第5期8卷 117-125页

作者： Wu Ju-Hua Xinxiang Univ Comp & Informat Engn Coll Xinxiang 453000 Henan Peoples R China

The allocation of resources in cloud computing has always been the focus of research, and as for how to improve the implementation speed, response time and utilization rate of system, a resource allocation scheduling optimization method in cloud computing based on improved double bee colony algorithm is proposed in this paper To introduce difference algorithm in artificial ant colony and improve its double bee colony can avoid the bee colony to fall into local optimum, while by introducing chaos algorithm, the convergence speed and precision of the optimal solution in the improved algorithm can be accelerated and the best resources in clouding computing can be found quickly to a certain extent. The simulation experiments show that the algorithm in this paper has improved the algorithm performance efficiently, which not only optimizes the resource allocation ability in cloud computing system, but also improves the resource utilization rate in cloud computing.

关键词： Resource Allocation in Cloud Computing Double Bee Colony Chaos algorithm difference algorithm

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Stochastic gradient algorithm for distributed parameter systems

Stochastic gradient algorithm for distributed parameter syst...

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第26届中国过程控制会议（CPCC2015）

作者： CHEN Jing ZOU Hongfen Wuxi Professional College of Science and Technology School of Internet of Things Engineering Jiangnan University

This paper proposes an identification method for distributed parameter *** using the difference algorithm,the distributed parameter system is simplified as a lumped parameter *** a stochastic gradient algorithm and a forgetting factor stochastic gradient algorithm are proposed to estimate the parameters of the lumped parameter ***,the parameters of the distributed parameter system can be *** simulation results indicate that the proposed method is effective.

关键词： Parameter estimation Distributed parameter system Stochastic gradient difference algorithm Forgetting factor

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The Application of difference algorithm to PPW Interference Cancellation in Heart Rate Detection

The Application of Difference Algorithm to PPW Interference ...

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International Conference on Measuring Technology and Mechatronics Automation

作者： Liu Xiaodong Li Yarong Yang Baoqing Univ DaLian JiaoTong Dept Mech Engn Dalian Peoples R China

ISBN: (纸本)9780769535838

A novel Interference Cancellation algorithm based on pressure pulse width (PPW) signal is presented, in order to ensure the high reliability of measurement results in pulse detection system with capacitive sensors. There is an output function of pulse width as the system analysis model, which has the corresponding relationship with pulse pressure. The analysis is conducted by using first order difference algorithm of discrete sequence, which c I an reveal the change rate of pulse signals. And the bubbling up sorting method is used for acquiring the pulse cycle automatically. The experimental comparison and analyses indicate that the sensor with this algorithm maintains a more effective way on filtering unorderly signal, especially enhancing the reliability of dynamic pulse detection.

关键词： heart rate interference cancellation difference algorithm reliability

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