The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
OFDM is a Multi-carrier modulation mode, and an efficient modulation technology. The quality of channel estimation is one of the influencing factors in OFDM system. To analyze the effects of channel estimation on OFDM system, the simulation of LS estimation algorithm under the condition of using pilot frequency and comparison of the simulation results were provided. The simulation results show that...
Due to the changeability and severity of near-surface wind field, it causes many potential safety hazards when retrieving the unmanned aerial vehicle (UAV). This thesis designs a control method for resisting the lateral sudden wind based on the sensor on multiple barometric pressures, compared to the traditional method of resisting continuous lateral wind, this method can resist the lateral sudden...
Navigation and obstacle avoidance is essential for an unmanned air vehicle (UAV) to achieve fully autonomous flying through urban environment. For that purpose a new method for navigation and obstacle detecting is presented in this paper. In this method a camera is combined to a GPS/INS integrated navigation for improving navigation precision and detecting obstacle in the environment. A sequence of...
On the base of the analysis about the concept and classification of product service system(PSS), the author classified the product service provider(PSP) into three types, including product-oriented PSP, use-oriented PSP and result-oriented PSP, and points the necessity on its research. Aiming at the three types of PSP, the author analyzed its characteristics, and gave its structure models and typical...
Support Vector Machine (SVM) is the focus of failure diagnose field. There is not a definite theory to guide the choice of its parameters. In this paper, the analysis and research is done to parameter optimization of SVM. The combined algorithm based on Quantum-behavior Particle Swarm Optimization (QPSO) and Simulated Annealing (SA) is present to optimize the parameters of SVM in order to improve...
Basing on the radio-frequency chip AT86RF212, the paper designed a wireless Data collection system. According to the performances and characters of chip AT86RF212, It adopted the company ATMEL's ZigBee protocol stack Bitcloud to carry through software development. Meanwhile, using the serial interface communication technologies, it realized data processing and displaying by Labview technologies. With...
The objective of this work is the design and development of the data acquisition and storage parts of a monitoring system that will be used for a certain control and guide equipment. The data captured and stored in a database will be an application that will diagnose failure of control and guide equipment. Data acquisition and data store were developed using finite-state machine model and virtual...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.