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Efficiency Improvement of Kalman Filter for GNSS/INS through One-Step Prediction of P Matrix

MATHEMATICAL PROBLEMS IN ENGINEERING 2015年第1期2015卷 1-13页

作者： Li, Qingli Ban, Yalong Niu, Xiaoji Zhang, Quan Gong, Linlin Liu, Jingnan Wuhan Univ Wuhan 430079 Hubei Peoples R China

To meet the real-time and low power consumption demands in MEMS navigation and guidance field, an improved Kalman filter algorithm for GNSS/INS was proposed in this paper named as one-step prediction of P matrix. Quantitative analysis of field test datasets was made to compare the navigation accuracy with the standard algorithm, which indicated that the degradation caused by the simplified algorithm is small enough compared to the navigation errors of the GNSS/INS system itself. Meanwhile, the computation load and time consumption of the algorithm decreased over 50% by the improved algorithm. The work has special significance for navigation applications that request low power consumption and strict real-time response, such as cellphone, wearable devices, and deeply coupled GNSS/INS systems.

关键词： KALMAN filtering GLOBAL Positioning System ELECTRIC power consumption computer algorithms COMPARATIVE studies

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Constrained adaptive tracking and command shaped vibration control of flexible hypersonic vehicles

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IET CONTROL THEORY AND APPLICATIONS 2015年第12期9卷 1857-1868页

作者： Su, Xiaofeng Jia, Yingmin Beihang Univ BUAA Div Res 7 Beijing 100191 Peoples R China Beihang Univ BUAA Dept Syst & Control Beijing 100191 Peoples R China

This study presents a new approach, which integrates the input shaping technique and the constrained adaptive backstepping control method, for constrained adaptive tracking and elastic vibration control of flexible hypersonic vehicles. Specifically, the input shaper as a feedforward part is implemented outside the feedback loop, which can achieve vibration suppression for flexible dynamics;whereas for the feedback loop, the vehicle model is decomposed into functional subsystems, and the decentralised approach is used. Then, by introducing the command filter and the auxiliary system, constrained adaptive control law is formulated to make the closed-loop system follow the shaped reference trajectory and attenuate the elastic vibration in the presence of parameter uncertainties, external disturbances and input saturation constraints. An attractive feature of this proposed control algorithm is that all signals of closed-loop system are uniformly ultimately bounded and the tracking error converges to a residual set which can be made sufficiently small by properly designing control parameters. Moreover, by applying the shaped commands, flexible dynamics with less elastic deformation and vibration can be achieved without destroying the closed-loop performance. Simulation results are provided to verify the effectiveness of the proposed control method.

关键词： Feedback loop parameter uncertainty vibration control Vehicle model control law Closed loop systems Control Methods hypersonic vehicles computer algorithms FLEXIBLE vibration suppression Adaptive tracking AUXILIARY SYSTEMS elastic vibration commands

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Wireless interference power estimation for inter-cell interference coordination

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IET COMMUNICATIONS 2015年第12期9卷 1539-1546页

作者： Wigren, Torbjorn Ericsson AB WMR TA SE-16480 Stockholm Sweden

To enable uplink inter-cell interference coordination in cellular networks, estimates of the powers generated by the own serving cell, the neighbour cells and the thermal noise processes need to be made available. An algorithm for such high-bandwidth interference power splitting is derived in the study. The algorithm does not require inter-base station communication. The resulting estimates support self-organising network interference management and coordinated scheduling, both technologies being important in new heterogeneous networks. A new method for G-matrix tracking is also outlined, based on the estimates obtained from the proposed algorithm. The performance evaluation, performed for a 3G wideband code division multiple access setup of the algorithm, shows that the estimation inaccuracy's of the proposed algorithm is below 10-15% in the relevant operating region.

关键词： WIRELESS communication systems INTERFERENCE channels (Telecommunications) computer algorithms BROADBAND communication systems CODE division multiple access 3G (Telecommunication)

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Multi-Cell Full-Duplex Wireless Communication for Dense Urban Deployment

Multi-Cell Full-Duplex Wireless Communication for Dense Urba...

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IEEE Global Communications Conference

作者： M. Moshiur Rahman Charles Despins Aaron Callard Gamini Senarath Sofiene Affes Dept. of Electrical Engineering ETS University of Quebec Huawei Canada Research Center INRS-EMT University of Quebec

ISBN: (纸本)9781509013296

Simultaneous bidirectional transmission and reception of signals on a single channel in a full duplex (FD) system is gaining increased attention from both academia and industry. Recent advances in radio transceiver design have been able to minimize the self interference (SI) to a great extent making realization of a FD transceiver possible. For FD deployment in a multi-cell environment, minimizing SI is not sufficient due to the presence of a complex array of network-wide interference. This paper investigates the critical deployment challenges for a dense urban FD multi-cell network and provides solutions for successful deployment of FD cellular networks. Extensive simulation results show that the proposed user selection and power control algorithms are able to increase the FD performance gain by more than 80% when compared to the traditional half duplex (HD) counterpart.

关键词： FOCAL LENGTH deployment Radio transceivers single-channel reception FULL DUPLEX CARRIER SYSTEM computer algorithms Simulation results signals Academic Settings Dense

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Proposal of Hardware-in-the-loop control platform for small fixed-wing UAVs

Proposal of Hardware-in-the-loop control platform for small ...

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Annual IEEE International Systems Conference

作者： Rauhe Abdulhamid Neusa M. F. de Oliveira Roberto d'Amore Departamento de Engenharia Eletronica e Computacao Instituto Tecnologico de Aeronautica

ISBN: (纸本)9781467395205

Unmanned Aerial Vehicles (UAVs) have received considerable attention from the academic community and technology solutions companies, given their civilian and military applications. The autopilot system shall be thoroughly tested in lab because an accident may cause irreversible damage to the UAV. This article presents a proposal of a Hardware-In-the-Loop platform for testing and validation of a small fixed-wing aircraft. Besides a communication system, it was developed a deflection measurement platform of the aircraft control surfaces. This measurement platform was validated, enabling future work on implementing embedded control algorithms.

关键词： Hardware-In-the-Loop systems UAVs Measurement of airplane control deflections Unmanned Aerial Vehicle computer hardware CONSOLE HARDWARE IN THE LOOP Aircraft control Fixed wing aircraft fixed wings COMMUNICATION SYSTEMS computer algorithms drone honey bees work implement

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Energy-Delay Aware Restricted Access Window with Novel Retransmission for IEEE 802.11ah Networks

Energy-Delay Aware Restricted Access Window with Novel Retra...

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IEEE Global Communications Conference

作者： Yanru Wang Kok Keong Chai Yue Chen John Schormans Jonathan Loo Sch. of Electron. Eng. & Comput. Sci. Queen Mary Univ. of London London UK Dept. of Comput. Commun. Middlesex Univ. London UK

ISBN: (纸本)9781509013296

Restricted Access Window (RAW) has been introduced to IEEE 802.11ah MAC layer to decrease collision probability. However, the inappropriate application of RAW duration for diverse groups of devices would increase uplink energy consumption, delay and lower down the data rate. In this paper, we study a RAW optimization problem with a novel retransmission scheme that utilizes the next empty slot for retransmission in the uplink. The problem is formulated based on overall energy efficiency and delay of each RAW by applying probability theory and Markov Chain. To jointly optimize energy efficiency and delay, an energy-delay aware window control algorithm is proposed to adapt RAW size by estimating the number of time slots and internal slot duration in one RAW for different groups. The optimal solution is derived by applying Gradient Descent approach. Simulation results show that our proposed algorithm improves up to 113.3% energy efficiency and reduces 53.4% delay compared to the existing RAW.

关键词： wireless LAN access protocols delays gradient methods Markov processes radio links MAC protocol Radio links gradient methods Markov chain wireless local area network (WLAN) Energy efficiency RETRANSMISSION delay Energy sources restricted access windows windows window computer algorithms collision probability

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Robust control of a plant with distributed delay

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AUTOMATION AND REMOTE CONTROL 2015年第4期76卷 721-731页

作者： Tsykunov, A. M. Astrakhan State Tech Univ Astrakhan Russia

This paper solves the robust control problem of a plant with distributed delay using a reference model. The plant is subjected to bounded exogenous disturbances and the parameters of its mathematical model appear unknown. The author suggests a control algorithm for compensating the a priori parametric uncertainty and the bounded exogenous disturbances with a desired accuracy. A numerical example with corresponding simulation results is provided.

关键词： reference model Distribute delay distribution Robust control Bounded computer algorithms Simulation results

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Fault Prediction Algorithm for Multiple Mode Process Based on Reconstruction Technique

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MATHEMATICAL PROBLEMS IN ENGINEERING 2015年第1期2015卷 1-8页

作者： Ma, Jie Xu, Jianan Beijing Informat Sci & Technol Univ Sch Automat Beijing 100192 Peoples R China

In the framework of fault reconstruction technique, this paper studies the problems of multiple mode process fault detection, fault estimation, and fault prediction systematically based on multi-PCA model. First, a multi-PCA model is used for fault detection in steady state process under different conditions, while a weighted algorithm is applied to transition process. Then, describe the faults quantitatively and use the optimization method to derive the fault amplitude under the sense of fault reconstruction. Fault amplitude drifts under different conditions even if the same fault occurs. To solve the above problem, consistent estimation algorithm of fault amplitude under different conditions has been studied. Last, employ the support vector machine (SVM) to predict the trend of the fault amplitude. Effectiveness of the algorithms proposed in this paper has been verified using Tennessee Eastman process as the study object.

关键词： computer algorithms PROBLEM solving ESTIMATION theory SUPPORT vector machines computer research

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An improved convergence rate of A-P reconstruction algorithm and application in signal processing

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JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS 2015年 287卷 12-19页

作者： Zhao, Chen Chai, Bencheng Chen, Xuelin Zhejiang Wanli Univ Coll Comp & Informat Ningbo 315100 Zhejiang Peoples R China Zhejiang Univ Coll Software Technol Ningbo 315100 Zhejiang Peoples R China

This paper presents a reconstruction formula in general shift-invariant signal spaces that improve the rate of A-P iterative algorithm. We use the algorithm to show reconstruction of signals from weighted samples and also show that there is better convergence than the old one. We study the algorithm with emphasis on its implementation in field of signal processing, which the signal spaces is sufficiently large to accommodate a large number of possible models. Numerical examples results are furnished to illustrate our results. (C) 2015 Elsevier B.V. All rights reserved.

关键词： STOCHASTIC convergence SIGNAL processing ITERATIVE methods (Mathematics) computer algorithms computer science -- Mathematics APPLIED mathematics

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Neural Network Control for the Probe Landing Based on Proportional Integral Observer

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MATHEMATICAL PROBLEMS IN ENGINEERING 2015年第1期2015卷 1-10页

作者： Li, Yuanchun Ma, Tianhao Zhao, Bo Changchun Univ Technol Dept Control Engn Changchun 130012 Peoples R China Chinese Acad Sci Inst Automat State Key Lab Management & Control Complex Syst Beijing 100190 Peoples R China

For the probe descending and landing safely, a neural network control method based on proportional integral observer (PIO) is proposed. First, the dynamics equation of the probe under the landing site coordinate systemis deduced and the nominal trajectory meeting the constraints in advance on three axes is preplanned. Then the PIO designed by using LMI technique is employed in the control law to compensate the effect of the disturbance. At last, the neural network control algorithm is used to guarantee the double zero control of the probe and ensure the probe can land safely. An illustrative design example is employed to demonstrate the effectiveness of the proposed control approach.

关键词： NEURAL networks (computer science) LANDING (Aeronautics) INTEGRALS PROPORTIONAL control systems computer algorithms AUTOMATIC control

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