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Canopy radiation and scattering signal contains abundant vegetation information. One can quantitatively retrieve the biophysical parameters by building canopy radiation and scattering models and inverting them. Joint simulation of the three-dimensional (3D) models for multiband may combine the advantages of different spectral (frequency) domains. It is also a useful tool for validation in remote sesnsing...
For a class of nonlinear systems with constraints, a full-state constrained prescribed performance controller based on the command filtered is designed. By combining the adaptive backstepping technique, the constraint command filter is adopted to adapt the constraint and avoid the expansion of the calculation. Pseudo-control hedging techniques are combined with command filters to compensate for errors...
There are high requirements on the control accuracy, dynamic performance and robustness of carrier-based aircraft landing. In the previous literature, the idea of landing control is to use the system output, and error's feedback to control, which takes a large lag in the control, and is difficult to fundamentally improve the landing control accuracy and dynamic performance and so on. In this paper,...
This paper proposes a novel carrier Phase noise (PN) pre-correction scheme with an adaptive PN prediction algorithm for Single-carrier Frequency-division multiple-access (SC-FDMA) systems to alleviate degradation due to the PN. Our proposed PN prediction algorithm is a modified polynomial fitting algorithm which is based on receding horizon principle. The parameters of the prediction model are optimized...
In this study, a novel feature selection framework is proposed to simultaneously perform classification and clinical scores prediction of Parkinson's disease (PD) via multi-modal neuroimaging data. Specifically, a new feature selection model is devised to capture discriminative features to train support vector regression model for clinical scores (e.g., sleep scores and olfactory scores) prediction...
The location and context switching, especially the indoor and outdoor scenario switching, provide basic and original information for various mobile applications. Diverse smartphone placements and limited battery supply pose challenge for the accurate and robust indoor-outdoor identification. In this paper, a pervasive indoor and outdoor scenario identification algorithm is proposed, which utilizes...
With the development of the ECM technology, cross-eye jamming technique becomes more and more practical. In order to study ECCM method for this jamming, retrodirective cross-eye and non-retrodirective cross-eye were studied and analyzed. The mathematical model of monopulse radar's sum signal and difference signal under cross-eye jamming is established and simulated. The simulation results show that...
High-speed equivalent modeling is extremely important for the analysis of HVDC solid state transformer (HVDC-SST), including a large number of input series output parallel (ISOP) dual active bridge (DAB) units with LLC structure. This thesis presents an equivalent model-based method to largely simplify the model of HVDC-SST with described structure. According to the characteristics of HVDC-SST with...
The existing automatic lubrication system of the wind turbines is prone to producing the condition of less lubrication or over lubrication, which is very harmful to the bearing's work state and life period. In this thesis, a dynamic lubrication theory is brought forward. Based on practical operation condition, it can provide the necessary supply of bearing lubricating oil according to a scheme of...
The signal transmitter for underwater acoustic communication (UAC) is a core component of underwater acoustic equipment. To satisfy the demand of underwater acoustic transmitter for small size and high source level, an embedded power amplifier based on H-bridge topology and an independent matching network are designed and implemented. The integrative performance is tested by water pool experiment,...
This paper presents a third order continuous-time (CT) delta-sigma (ΔΣ) modulator with a fast three-level feedback scheme. The proposed technique uses two decorrelated 1-bit quantisers to produce a three-level feedback signal without requiring a decoder in the feedback path thus enabling high-speed operation. An efficient dynamic-element matching technique is also implemented to mitigate the weak...
The stress and strain of the plastic profile generated during its calibrating and cooling in the calibrator will result in the deformation of the profile. The reversed deformation design of the calibrator cavity is an effective method to solve this problem. The thermal stress of the profile during its calibrating and cooling in calibrator is analyzed by the thermo-mechanical coupled numerical simulation...
A mobile Differential Absorption Lidar (DIAL) system capable of measuring carbon dioxide (CO2), methane (CH4), and aerosols has been developed. The mobile DIAL laboratory has been operated in day and night conditions at various industrial sites, including a coal fired power plant with both conventional and supercritical steam turbines. A system overview of the DIAL instrument and some representative...
The regular forging process has been the primary technology for forging workpieces manufacturing because of its well-known adaptation and performance, and it usually needs thousands of input power. In this study, the energy consumption of the conventional valve-controlled system for 22 MN forging press was analyzed firstly, and depicted that the valve-controlled system had huge energy losses. Then...
This paper studies a class of switched Linear Parameter Varying (LPV) systems in which different control faults are modeled as different system modes according to parameter varying. Two methods are proposed based on the hysteresis method of Multiple Lyapunov function, and H∞ state feedback and output feedback controllers are designed respectively by solving Linear Matrix Inequalities (LMIs). The method...
Force sensing including collision position, force direction and force size makes robots smoothly interact with environment to strongly adapt to outside world. Skin sensing imitates principle of human skin using special material and physical structure with disadvantages of complex design, low sampling rate, and poor generality and so on. In this paper, the method of using fore/torque sensor to calculate...
In this paper, a new powerful pedestrian feature extraction algorithm named bilayer difference feature is proposed. In this new feature, two different features are used for detecting pedestrians and eliminating false alarms respectively. The upper layer of bilayer difference feature is constituted by improved accumulate binary Haar (ABH) feature. ABH feature could enhance the ability of illumination...
With the rapid development of highway construction and gradual improvement of road network construction in China, road maintenance work has been paid more and more attention. The research for pavement cracks automatic detection and recognition is particularly urgent. This thesis designs a pavement crack detection system based on FPGA. The system uses Altera's DE2 development board as the hardware...
Generally, traditional identification algorithm of Duffing oscillator bases on the transitions of phase diagram, which often needs a large number of cumulative inputs to transform the system from chaos to the large-scale periodic state, which limits the applications of Duffing oscillator. A new algorithm based on Kalman gain is proposed in the paper to predict state transitions of the Duffing oscillator...
Aiming at the currently exist problems about costly and low communication reliability of fault passage indicator communication networking mode in distribution system, a ZigBee based networking scheme of fault indication system is proposed. A fault information wireless sensor network composed of numerous fault Passage indicators is built. The sensing network equipment, network structure and equipment...
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