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High resolution imaging is an important trend for SAR. The wide bandwidth signal is a must for high resolution. The error of traditional model based on the narrow bandwidth system may be inevitable for high resolution imaging. In this paper, a general SAR echo model is derived for the wide bandwidth system, and we also get the error factor between the traditional and general model. By simulating the...
In order to improve the reliability and accuracy of the SINS/CNS/GPS integrated system, a fault-tolerant integrated navigation algorithm based on federated Kalman filter is proposed. The architecture of the federated Kalman filter includes a master filter, two local filters, and two fault detection functions which are based on the residuals of the local filter. Because the choosing of threshold for...
K and T indexes are important indicators to measure the maneuverability of ship. Usually Z-type test is used to calculate the ship maneuverability indexes. This paper presents a method to identify the ship maneuverability indexes K and T by applying Fourier series approximation method. And it is verified based on the Z-type test data of training vessel YUKUN that this method is convenient and efficient.
A comparison of two control strategies using extended linearisation - with and without an integral part - is presented in this paper for the tracking control of a hydrostatic transmission. An unknown leakage volume flow and a resulting load torque are taken into account as lumped disturbances. These disturbances and two unmeasurable state variables - the normalised swashplate angle and the normalised...
This paper studies adaptive model predictive control (AMPC) of systems with time-varying and state-dependent uncertainties. We propose an estimation and prediction architecture within the min-max MPC framework. An adaptive estimator is presented to estimate the set-valued measure of the uncertainty using piecewise constant adaptive law. We show that this measure can be arbitrarily accurate if the...
This paper addresses the curse of dimensionality in the numerical solution of stationary Fokker-Planck equations. Combined with Chebyshev spectral differentiation, the tensor approach significantly reduces the degrees of freedom of the approximation essentially in exchange for nonlinearity, such that the resulting discretized nonlinear system is solved by alternating least squares. Enforcement of...
This paper not only analyzed four types of land subsidence technologies such as leveling, GNSS, InSAR and layerwise mark, but also compared the observation accuracy, spatial and temporal resolution and. This paper studied data fusing and interpolation calculation, then put forward a new data fusing theory and interpolation method. Using this theory fuses leveling and InSAR land subsidence data, receives...
The industrial robot plays an increasingly important role in manufacturing industry, but it is limited by its high prerequisite of programming on users, which is time consuming and challenging. In this context, a mechanism enabling autoprogram of robot is desired. Learning from demonstration system (LDS) is one of systems that aim on this goal. In this paper, we present a graph based representation...
Large supercritical units are the future development direction of large-scale thermal power plants. Dynamic modeling of power plants is fundamental to control system design and performance studies. This paper aims to study the whole process mathematical model of 1000 MW ultra-supercritical unit. Based on mechanism analysis and model simplification, boiler is divided into four parts including the economizer,...
Zoeppritz's equation is a set of equations that describe the relationship between the displacement amplitude of the reflection and refraction waves and the one of the incident plane wave at the interface of two media, from which the partitioning of wave energy at the interface can be inferred. The echo signal energy is directly affected by the value of the incident angle when oblique incidence of...
Various cis-regulatory module (CRM) predictors have been proposed in the last decade. Several well-established CRM predictors adopted different categories of prediction strategies, including window clustering, probabilistic modeling and phylogenetic footprinting. Appropriate integration of them has a potential to achieve high quality CRM prediction. This study analyzed four existing CRM predictors...
This paper introduces a few iterative algorithms for the governing equations of motion. The algorithms described here cater for a wide range of flexible mechanism models. These iterative processes facilitate the straightforward extension to solve flexible multibody dynamics by including additional constraints. The convergence analysis of the iteration approach is achieved. The paper focuses on the...
With only one contact point with ground, the balance control problem of Single wheel robot (SWR) is still a big challenge for researchers. In this paper, a new nonlinear control algorithm—ADRC (active disturbance rejection control technique) was proposed. The integration simulation by ADAMS and MATLAB of flywheel balanced SWR is presented. The integrated platform provides an avenue for developing...
For a class of 3rd-order switched linear systems, we explore a way to approximate the spectral abscissa by means of generalized coordinate transformations. Base on the classic result of matrix equation, the minimum of matrix set measure can be obtained after each transformation. By applying transformations iteratively, a computational procedure is developed for finding the transformation matrix and...
The problem of a flight vehicle intercepting an unknown maneuvering target is investigated. Interceptor's possible guidance laws are considered while target's limited maneuver forms are assumed. The terminal guidance is divided into several phases and system information is expressed by a few matrices. We describe the pursuit-evasion scenario as an evolutionary game process. An approach to formulation...
This paper reviews the integrated perturbation analysis - sequential quadratic programming (IPA-SQP) approach. The IPA-SQP approach has been proposed to address computational challenges in nonlinear model predictive control (MPC) problems. This approach combines the complementary features of perturbation analysis and sequential quadratic programming in a unified framework. An overview of the IPA-SQP...
Polygon detection and Localization technique could be applied in the industrial environment as many industrial objects contain some planes with polygons inside. The objects could be located when the polygons inside them have been located. In this paper, we propose a new method for polygon detection and localization. First, the Canny operator is applied to acquire the edges of the image and the line...
When the wave piercing catamaran is sailing in the ocean at a high speed, longitudinal motion might bring some adverse effects on its performance. The vertical acceleration generated makes the passengers and crew sick and the catamaran will be in a short-time failure. On general conditions, a ride control system is adopted to solve these problems. Firstly, a pitching and heaving motion model for the...
In this paper, we consider the vibration control problem of a flexible string system in the presence of input saturation. The dynamics of the string system are represented by the coupled partial differential equation (PDE) and ordinary differential equation (ODE). In order to suppress the transverse vibration of the flexible string system, boundary control is proposed by introducing a well-defined...
For the structural characteristics of the inverter main circuits usually used in PV grid-connected systems, a novel PV grid-connected power conditioning system(PVPCS) is proposed, in which reactive power compensation and harmonic suppression are integrated. The system can improves not only power quality but also efficiency, and reduces power wasting. The working principle of the system, instantaneous...
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