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Command filtered integrated estimation guidance and control for strapdown missiles with circular field of view
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作者 Wei Wang Jiaqi Liu +2 位作者 Shiyao Lin Baokui Geng Zhongjiao Shi 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2024年第5期211-221,共11页
In this paper,an integrated estimation guidance and control(IEGC)system is designed based on the command filtered backstepping approach for circular field-of-view(FOV)strapdown missiles.The threedimensional integrated... In this paper,an integrated estimation guidance and control(IEGC)system is designed based on the command filtered backstepping approach for circular field-of-view(FOV)strapdown missiles.The threedimensional integrated estimation guidance and control nonlinear model with limited actuator deflection angle is established considering the seeker's FOV constraint.The boundary time-varying integral barrier Lyapunov function(IBLF)is employed in backstepping design to constrain the body line-of-sight(BLOS)in IEGC system to fit a circular FOV.Then,the nonlinear adaptive controller is designed to estimate the changing aerodynamic parameters.The generalized extended state observer(GESO)is designed to estimate the acceleration of the maneuvering targets and the unmatched time-varying disturbances for improving tracking accuracy.Furthermore,the command filters are used to solve the"differential expansion"problem during the backstepping design.The Lyapunov theory is used to prove the stability of the overall closed-loop IEGC system.Finally,the simulation results validate the integrated system's effectiveness,achieving high accuracy strikes against maneuvering targets. 展开更多
关键词 integrated estimation guidance and control Circular field-of-view Time-varying integral barrier Lyapunov function Command filtered backstepping control Nonlinear adaptive control Extended state observer
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AN INTEGRAL ESTIMATE AND THE EQUIVALENT NORMS ON F(p, q, s, k) SPACES IN THE UNIT BALL 被引量:8
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作者 张学军 黎深莲 +1 位作者 尚清丽 郭雨婷 《Acta Mathematica Scientia》 SCIE CSCD 2018年第6期1861-1880,共20页
In this article, the authors give a typical integral's bidirectional estimates for allcases. At the same time, several equivalent characterizations on the F(p, q, s, k) space in theunit ball of Cn are given.
关键词 F(p Q s k) space integral estimate equivalent norm unit ball
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INTEGRATED DEMAND FORECASTING TO SUPPORT URBAN PLANNING OF LOW-CARBON PRECINCTS:THE WASTE SCENARIO
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作者 Steffen Lehmann Atiq U.Zaman John Devlin 《Journal of Green Building》 2013年第2期54-70,共17页
INTRODUCTION Waste is a symbol of inefficiency in modern society and represents misallocated resources.This paper outlines an ongoing interdisciplinary research project entitled‘Integrated ETWW demand forecasting and... INTRODUCTION Waste is a symbol of inefficiency in modern society and represents misallocated resources.This paper outlines an ongoing interdisciplinary research project entitled‘Integrated ETWW demand forecasting and scenario planning for low-carbon precincts’and reports on first findings and a literature review.This large multi-stakeholder research project has been designed to develop a shared platform for integrated ETWW(energy,transport,waste,and water)planning in a low-carbon urban future,focusing on synergies and alternative approaches to urban planning.The aim of the project is to develop a holistic integrated software tool for demand forecasting and scenario evaluation for residential precincts covering the four domains(ETWW),using identified commonalities in data requirements and model formulation.The authors of this paper are overseeing the waste domain,while other researchers in the team have expertise in the remaining domains. 展开更多
关键词 low carbon integrated demand estimation forecasting performance indicators resource management diversion rate zero waste
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Contributions to Hom-Schunck optical flow equations-part I: Stability and rate of convergence of classical algorithm 被引量:2
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作者 DONG Guo-hua AN Xiang-jing FANG Yu-qiang HU De-wen 《Journal of Central South University》 SCIE EI CAS 2013年第7期1909-1918,共10页
Globally exponential stability (which implies convergence and uniqueness) of their classical iterative algorithm is established using methods of heat equations and energy integral after embedding the discrete iterat... Globally exponential stability (which implies convergence and uniqueness) of their classical iterative algorithm is established using methods of heat equations and energy integral after embedding the discrete iteration into a continuous flow. The stability condition depends explicitly on smoothness of the image sequence, size of image domain, value of the regularization parameter, and finally discretization step. Specifically, as the discretization step approaches to zero, stability holds unconditionally. The analysis also clarifies relations among the iterative algorithm, the original variation formulation and the PDE system. The proper regularity of solution and natural images is briefly surveyed and discussed. Experimental results validate the theoretical claims both on convergence and exponential stability. 展开更多
关键词 optical flow Hom-Schunck equations globally exponential stability convergence convergence rate heat equations energy integral and estimate Gronwall inequality natural images REGULARITY
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GNSS receiver autonomous integrity monitoring(RAIM)algorithm based on robust estimation 被引量:19
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作者 Yuanxi Yang Junyi Xu 《Geodesy and Geodynamics》 2016年第2期117-123,共7页
Integrity is significant for safety-of-life applications. Receiver autonomous integrity monitoring(RAIM) has been developed to provide integrity service for civil aviation. At first,the conventional RAIM algorithm i... Integrity is significant for safety-of-life applications. Receiver autonomous integrity monitoring(RAIM) has been developed to provide integrity service for civil aviation. At first,the conventional RAIM algorithm is only suitable for single fault detection, single GNSS constellation. However, multiple satellite failure should be considered when more than one satellite navigation system are adopted. To detect and exclude multi-fault, most current algorithms perform an iteration procedure considering all possible fault model which lead to heavy computation burden. An alternative RAIM is presented in this paper based on multiple satellite constellations(for example, GPS and Bei Dou(BDS) etc.) and robust estimation for multi-fault detection and exclusion, which can not only detect multi-failures,but also control the influences of near failure observation. Besides, the RAIM algorithm based on robust estimation is more efficient than the current RAIM algorithm for multiple constellation and multiple faults. Finally, the algorithm is tested by GPS/Bei Dou data. 展开更多
关键词 GNSS Integrity Receiver autonomous integrity monitoring(RAIM) Robust estimation Fault detection
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DISOPE distributed model predictive control of cascade systems with network communication 被引量:1
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作者 Yan ZHANG Shaoyuan LI 《控制理论与应用(英文版)》 EI 2005年第2期131-138,共8页
A novel distributed model predictive control scheme based on dynamic integrated system optimization and parameter estimation (DISOPE) was proposed for nonlinear cascade systems under network environment. Under the d... A novel distributed model predictive control scheme based on dynamic integrated system optimization and parameter estimation (DISOPE) was proposed for nonlinear cascade systems under network environment. Under the distributed control structure, online optimization of the cascade system was composed of several cascaded agents that can cooperate and exchange information via network communication. By iterating on modified distributed linear optimal control problems on the basis of estimating parameters at every iteration the correct optimal control action of the nonlinear model predictive control problem of the cascade system could be obtained, assuming that the algorithm was convergent. This approach avoids solving the complex nonlinear optimization problem and significantly reduces the computational burden. The simulation results of the fossil fuel power unit are illustrated to verify the effectiveness and practicability of the proposed algorithm. 展开更多
关键词 Cascade systems Dynamic integrated system optimization and parameter estimation (DISOPE) Model predictive control (MPC) Distributed control system (DCS) Autonomous agents Fossil fuel power unit (FFPU)
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CAUCHY PROBLEM FOR A NONLINEAR SINGULAR INTEGRAL-DIFFERENTIAL EVOLUTION SYSTEM
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作者 ZHANG LINGHAI(Inst.of Appl.Phys.and Comp.Math.,Beijing 100088) 《Applied Mathematics(A Journal of Chinese Universities)》 SCIE CSCD 1994年第1期45-53,共9页
We study the Cauchy problem for a nonlinear evolution system with singularintegral differential terms.By means of some a priori estimates of the solution and theLeray-Schauder's fixed point theorem, we prove the e... We study the Cauchy problem for a nonlinear evolution system with singularintegral differential terms.By means of some a priori estimates of the solution and theLeray-Schauder's fixed point theorem, we prove the existence and the uniqueness theoremsof the generalized global solution of the mentioned problem. 展开更多
关键词 Cauchy Problem Nonlinear Evolution System Singular integral-differentialTerm Integral estimate.
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The Integration of Dual-domain Method for Estimating the Drift Function of Financial Assets
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作者 YE Xu-guo DU Xue-qiao 《Chinese Quarterly Journal of Mathematics》 CSCD 2011年第2期190-195,共6页
Time-domain state-domain methods are common approaches in modern financial analysis.Economic conditions vary time,drift function depends on time and price level for a given state variable.In this paper,to consistently... Time-domain state-domain methods are common approaches in modern financial analysis.Economic conditions vary time,drift function depends on time and price level for a given state variable.In this paper,to consistently estimate the bivariate drift function,our purpose a new dynamic integrated estimator by combing time-and state-domain methods for estimating drift function.And we establish its asymptotic properties and illustrates it outperforms some old ones by simulations. 展开更多
关键词 TIME-DOMAIN state-domain integrated estimator drift function
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SOME RESULTS CONCERNING GROWTH OF POLYNOMIALS
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作者 Abdul Liman Sajad Amin Baba 《Analysis in Theory and Applications》 2008年第4期351-363,共13页
In this paper, we establish inequalities for polynomials with restricted zeros, which in particular yields interesting generalizations of some Zygmund type inequalities for polynomial.
关键词 POLYNOMIAL integral mean estimate
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A sharp estimate of positive integral points in6-dimensional polyhedra and a sharp estimate of smooth numbers
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作者 LIANG Andrew YAU Stephen ZUO Huai Qing 《Science China Mathematics》 SCIE CSCD 2016年第3期425-444,共20页
Inspired by Durfee Conjecture in singularity theory, Yau formulated the Yau number theoretic conjecture(see Conjecture 1.3) which gives a sharp polynomial upper bound of the number of positive integral points in an n-... Inspired by Durfee Conjecture in singularity theory, Yau formulated the Yau number theoretic conjecture(see Conjecture 1.3) which gives a sharp polynomial upper bound of the number of positive integral points in an n-dimensional(n≥3) polyhedron. It is well known that getting the estimate of integral points in the polyhedron is equivalent to getting the estimate of the de Bruijn function ψ(x, y), which is important and has a number of applications to analytic number theory and cryptography. We prove the Yau number theoretic conjecture for n = 6. As an application, we give a sharper estimate of function ψ(x, y) for 5≤y < 17, compared with the result obtained by Ennola. 展开更多
关键词 integral points tetrahedron sharp estimate
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A regression model-based method for indoor positioning with compound location fingerprints 被引量:3
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作者 Tomofumi Takayama Takeshi Umezawa +1 位作者 Nobuyoshi Komuro Noritaka Osawa 《Geo-Spatial Information Science》 SCIE CSCD 2019年第2期107-113,I0003,共8页
This paper proposed and evaluated an estimation method for indoor positioning.The method combines location fingerprinting and dead reckoning differently from the conventional combinations.It uses compound location fin... This paper proposed and evaluated an estimation method for indoor positioning.The method combines location fingerprinting and dead reckoning differently from the conventional combinations.It uses compound location fingerprints,which are composed of radio fingerprints at multiple points of time,that is,at multiple positions,and displacements between them estimated by dead reckoning.To avoid errors accumulated from dead reckoning,the method uses short-range dead reckoning.The method was evaluated using 16 Bluetooth beacons installed in a student room with the dimensions of 11×5 m with furniture inside.The Received Signal Strength Indicator(RSSI)values of the beacons were collected at 30 measuring points,which were points at the intersections on a 1×1 m grid with no obstacles.A compound location fingerprint is composed of RSSI vectors at two points and a displacement vector between them.Random Forests(RF)was used to build regression models to estimate positions from location fingerprints.The root mean square error of position estimation was 0.87 m using 16 Bluetooth beacons.This error is lower than that received with a single-point baseline model,where a feature vector is composed of only RSSI values at one location.The results suggest that the proposed method is effective for indoor positioning. 展开更多
关键词 Indoor positioning integrated estimation radio fingerprinting dead reckoning machine learning non-linear regression
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AN EXPONENTIAL WAVE INTEGRATOR PSEUDOSPECTRAL METHOD FOR THE SYMMETRIC REGULARIZED-LONG-WAVE EQUATION 被引量:2
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作者 Xiaofei Zhao 《Journal of Computational Mathematics》 SCIE CSCD 2016年第1期49-69,共21页
An efficient and accurate exponential wave integrator Fourier pseudospectral (EWI-FP) method is proposed and analyzed for solving the symmetric regularized-long-wave (SRLW) equation, which is used for modeling the... An efficient and accurate exponential wave integrator Fourier pseudospectral (EWI-FP) method is proposed and analyzed for solving the symmetric regularized-long-wave (SRLW) equation, which is used for modeling the weakly nonlinear ion acoustic and space-charge waves. The numerical method here is based on a Gautschi-type exponential wave integrator for temporal approximation and the Fourier pseudospectral method for spatial discretization. The scheme is fully explicit and efficient due to the fast Fourier transform. Numerical analysis of the proposed EWI-FP method is carried out and rigorous error estimates are established without CFL-type condition by means of the mathematical induction. The error bound shows that EWI-FP has second order accuracy in time and spectral accuracy in space. Numerical results are reported to confirm the theoretical studies and indicate that the error bound here is optimal. 展开更多
关键词 Symmetric regularized long-wave equation Exponential wave integrator Pseudospecral method Error estimate Explicit scheme Large step size
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Integral inference method for da/dN-ΔK and P-da/dN-ΔK curves
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作者 FU Hui-min WU Qiong 《航空动力学报》 EI CAS CSCD 北大核心 2011年第6期1251-1256,共6页
The integral inference method for fatigue crack growth(FCG) curve was established based on the two-variance regression theory.The estimates of da/dN-ΔK curve and P-da/dN-ΔK curve with high confidence level and high ... The integral inference method for fatigue crack growth(FCG) curve was established based on the two-variance regression theory.The estimates of da/dN-ΔK curve and P-da/dN-ΔK curve with high confidence level and high survival probability were also given.FCG data scatter with stress intensity factor ranges in reality,which limits the group test method's application.The presented method analyzes FCG curve as an integration,thus it can exploit the lengthwise information among the FCG rates corresponding to different stress intensity factor ranges.Therefore,compared with group test method,the presented method can not only save specimens,but also have higher precision in the evaluations of da/dN-ΔK and P-da/dN-ΔK curves. 展开更多
关键词 AERO-ENGINE fatigue crack growth(FCG) crack growth rate integral estimate RELIABILITY
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The Integration of Dual-Domain Method for Estimating the Volatility of Financial Assets
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作者 Xue Qiao DU Xu Guo YE 《Journal of Mathematical Research and Exposition》 CSCD 2010年第3期507-518,共12页
Time- and state-domain methods are two common approaches for nonparametrically estimating the volatility of financial assets. Economic conditions vary over time in real financial market. It is reasonable to expect tha... Time- and state-domain methods are two common approaches for nonparametrically estimating the volatility of financial assets. Economic conditions vary over time in real financial market. It is reasonable to expect that volatility depends on both time and price level for a given state variable. Recently, Fan, et al (2007) proposed the idea of dynamically integrated method in both time-and state domain. This idea has become an interesting topic in the estimation of volatility. In this paper, our purpose is to discuss the integrated method in the estimation of volatility. Simulations are conducted to demonstrate that the newly integrated method outperforms some old ones, and the results of simulations demonstrate this fact. Furthermore, we establish its asymptotic properties. 展开更多
关键词 VOLATILITY ESTIMATION integrated estimator.
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ASYMPTOTIC PROPERTY FOR THE SOLUTION TO THE GENERALIZED KORTEWEG-DE VRIES EQUATION
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作者 张领海 《Acta Mathematicae Applicatae Sinica》 SCIE CSCD 1994年第4期377-386,共10页
We study temporal asymptotic property for the solution of the initial value problem for the generalized nonlinear Korteweg-de Vries equation, which is a nonlinear dissipative dispersive wave equation. The decay result... We study temporal asymptotic property for the solution of the initial value problem for the generalized nonlinear Korteweg-de Vries equation, which is a nonlinear dissipative dispersive wave equation. The decay results of the solution follow from the priori L2 integral estimates and the Fourier transform. 展开更多
关键词 Korteweg-de Vries equation asymptotic property integral estimate
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