In autonomous navigation systems, localization is the most important problem to be solved. In this note, we propose the algorithm to localize an unmanned ground vehicle (UGV) equipped with a global positioning system ...
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ISBN:
(纸本)9789746724913
In autonomous navigation systems, localization is the most important problem to be solved. In this note, we propose the algorithm to localize an unmanned ground vehicle (UGV) equipped with a global positioning system (GPS), an odometer and an electronic compass. The proposed scheme is based on the unscented Kalman filter (UKF). To improve the accuracy and robustness, the novel noise model of data from an electronic compass is incorporated in the system modeling. The performance of our simple algorithm is evaluated by the experimental results that strongly confirm the benefit even during GPS outage in some short period of time.
A deconvolution algorithm based on the generalized conjugate gradient method and modified iteration termination condition was proposed to determine the impulse response of the target in the time domain. The improved i...
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Electronic throttles are used to adjust the air mass flow in gasoline engines. Due to friction, return spring non-linearities and parameter variations on the one hand and requirements for precise positioning of the th...
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Several different electrical actuators are utilized to influence mass flows in the gas exchange system of modern combustion engines. control loops for exhaust gas recirculation rate or boost-pressure strongly rely on ...
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Pulse laser range detector is to measure the distance by estimating the time delay between the emitting pulse and echo *** this paper,a mathematical model for the target echo signal of laser fuze has been established;...
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Pulse laser range detector is to measure the distance by estimating the time delay between the emitting pulse and echo *** this paper,a mathematical model for the target echo signal of laser fuze has been established;in accordance with this model,the formulas for echo time-delay estimation and for amplitude estimation based on least squares criterion have been *** is argued and simulated that the resolution of echo time-delay estimation could be improved through multi-reference correlation *** illustrate that the approach enables pulsed laser fuze to perform high-precision ranging under a low signal-to-noise ratio condition.
A Micro WEDM pulse generator is designed in this paper. It can adapt to the needs of various processing conditions. In additional, fuzzy control theory was applied to the pulse generator, which can automatically adjus...
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For the situation that the firing dispersion declines after the rocket-assisted mortar shell adopts the range-extended technology, through the statistics of the data that was obtained in the range test, all reasons th...
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ISBN:
(纸本)9787504656025
For the situation that the firing dispersion declines after the rocket-assisted mortar shell adopts the range-extended technology, through the statistics of the data that was obtained in the range test, all reasons that influence the range dispersion of the ammunition and its influence level was simulated and analyzed. It was concluded that the range error caused by the deviation of all parameters during the work of the engine accounts for 70 percent of total range error. Using the accelerometer to measure the axial acceleration of the projectile during the working period of the rocket engine was put forward and the real trajectory according to the acceleration results was calculated with established trajectory equation. The optimized startup time of the resistance force correction mechanism was determined after being compared with the pre-determined trajectory. The method with low cost and by self determination for correcting the trajectory comes out. Monte Carlo Method and the range test were performed to verify the feasible of this method. It was concluded that the range dispersion can be reduced by 40 percent or more after the trajectory was corrected. At the same time, it was proved that the zero drift of the accelerometer after the launching over-loading is the main reason that influences precision for the estimation of the trajectory and the prediction of the falling point, and it was indicated that when the range dispersion of the projectile is 1/300, the zero drift of the accelerometer should be less than 0.04 percent of the measurement range.
A novel Micro-Fluidic Self-destruct Device (MFSD) for microchips has been exploited;the purpose of the MFSD is to destroy the structure and date of the microchip, especially in abnormal environment. According to the c...
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The collaborative simulation of complex product is a very complicated process. So it is necessary to investigate methods to learn the process details and parameters change of collaborative simulation. The system struc...
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In an introduction, the present paper gives a short survey of existing vehicle-dynamics control systems that is based on some examples and thus does not claim to be complete. There is a tendency towards an increased i...
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