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The optimization indices and constraints of flight pipeline planning was established, the method of extracting and clipping terrain was proposed, and the model of flight pipelines in two dimensions was established. By proposing the definition of density constraint, SAS was improved to DCSAS, and the complexity of DCSAS was analyzed. The simulation result proved that DCSAS, comparing with SAS, has...
Considering the pitching channel of air breathing hypersonic vehicle X-43A as plant, flight control system was designed according to the 6 degree of freedom nonlinear model. The flight control system includes two loops, of which the structure is conventional mode. The guidance loop is a PD controller, while the control loop is composed of two fuzzy logic controllers. The guidance loop leads the vehicle...
Aiming at the electro-hydraulic servo system with mismatched uncertainties, an adaptive backstepping neural network position controller design is presented. By applying backstepping design strategy and online approaching uncertainties with RBF neural networks, a nonlinear controller for a hydraulic servo-system is developed based on Lyapunov stability theory, the problem of extreme expanded operation...
The FPGA design tools now wildly used would optimize finite state machinepsilas encoding style and circuit automatically to achieve better performance on timing and area, which made finite state machine full of potential dangerous for space applications. This paper propounded some design methods such as redundancy the state flip-flops and brought in third-part design tool in FPGA design flows to conquer...
In order to reduce the operation cost of the deep space missions, a new autonomous navigation algorithm based on the observed images information of different celestial objects is proposed. First, it uses the directional data from the moon and the earth sensors to determine the initial orbit information of the explorer by geometrical method. Then combination with the observation from the star tracker,...
Jet element is the key element of the attitude control system of some aircrafts. The switch time of jet element is critical factor to control precision. In this study, Jet element is investigated and the math model of jet element is constituted in order to decrease the switch time. The factors which effect the switch time are studied. The static and dynamic characteristics of the device were investigated...
The hemispherical resonator gyro (HRG) is a vibration gyro with high accuracy, long life and great reliability. Analyzing and studying its output signal is one of the key techniques to science evaluating performance. This paper presents the principle of the HRG, induces the Allan variance methods, and uses the MATLAB programming to simulate and calculate. Itpsilas the first time in China to apply...
Support Vector Machine (SVM), based on structural risk minimization principle, is now widely used in pattern recognition, classification and other research fields. It shows better generalization performance than traditional statistical learning theory, especially in small samples. In this paper, some dimensionless parameter is selected as SVM eigenvector, and then support vector machine is applied...
In order to improve the performance of the lower-limb FES cycling, a method of measuring the automatic control Power in the cycling was developed based on the estimation of dynamic models of the response from muscle stimulation intensity to power. The identified models were used for analytical design of feedback controllers. The results showed that this method had ability to achieve an accurate control...
The primary goal of this research is to develop a novel intelligent fault diagnosis method employing neuro-fuzzy transductive inference algorithm (NFTI) in order to solve the the global model application problem, as well as the global availability of the model and sample data set. The method is characterized by that a personal local model which is established for every new fault symptom input data...
Using geometry asymmetry, ac electroosmosis (AC EO) experiments are presented on a traveling wave electroosmosis (TW EO) device. To compare AC EO and TWEO, 1.5 mS/m KCl electrolysis is selected as pumping solution. AC EO and TW EO flow velocities versus horizontal height were measured, which showed that the flow was generated at the electrodes. The AC EO and TW EO flow velocities depending on voltage...
The problem of robust Hinfin filtering based on sampled measurement for uncertain systems is studied. Based on piecewise Lyapunov stability criterion, the sample interval dependent conditions for the existence of such filters are established, which are less conservative. The admissible filters can be obtained from the solution of convex optimization problems in terms of linear matrix inequalities,...
The objective of this work is to solve the problems of On-board Computer (OBC) in Micro-satellite. With the limit of size and weight, and the requirement of multifunction and high-performance, itpsilas almost impossible to design an eligible Micro-satellite OBC by regular methods. To address this issue, this paper researches reconfiguration technique, and proposes one OBC design based on it. The reconfigurable...
Utilizing the property of the continuous wavelet transform (CWT) of asymptotic signals when both the scale and the signal are discrete, we propose a new approach for ridge extraction. A more reliable ridge is formed by using only the discontinuity points on the ridge extracted by the conventional method. Inequalities are derived to state that the scale interval and the sampling frequency depend on...
The initial sizing of the propulsion system takes an important role in the preliminary design stage for space missions. The aim of this paper is to present an initial sizing method to evaluate the amount of propellant required for the on-orbit servicing spacecraft that can upgrade on-orbit satellites. Specially, one servicing spacecraft (SSc) is considered to be initially in the same direction as...
Reliability is very important for the systems in aeronautics and astronautics. Despite its appeal for attractive mathematical features the PLP model suffers from a few drawbacks. Duane and Crow/AMSAA models are widely used in the reliability growth assessment. But for the reliability growth case, the intensity function of the PLP has the rather unrealistic feature that it tends to infinite as time...
Distributed spacecraft systems implement enormous new functions by augmenting multiple spacecrafts as unified. That demands the precise positioning information about each satellite nodes in the distributed spacecraft system. To achieve the position calibration, multidimensional scaling is introduced. MDS computes a 3-dimensional map of each satellite nodes from the distance information in the system...
A new method is presented in order to solve the problem of randomness of the initial selection for nearest neighbor clustering algorithm and redundant nodes introduced by subtractive clustering algorithm, namely, the algorithm that contain pruning technique of subtractive clustering algorithm and nearest neighbor clustering algorithm combine together,and accomplish the learning of training samples...
Multisensor image registration is necessary in many applications of remote sensing imagery, the crucial problem is how to establish the correspondence between the features extracted from the reference and input image. Generally, most existing methods only use feature similarity or intensity similarity. In this paper, a coarse-to-refined method, which combines modified scale invariant feature transform...
Region of interest (ROI) coding technique could effectively compress the image data while the important information could be saved well, and itpsilas very suitable to the compression of remote sensing images. The ROI needs to be defined in advance to the existing ROI coding algorithms, while the ROI of remote sensing images cannot be defined by the users in some conditions. So the application of the...
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