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Beijing, China

Fu X.-Z.,Unit 91635 | Fu X.-Z.,Wuhan Naval University of Engineering | Liu Z.,Wuhan Naval University of Engineering | Li C.-X.,Wuhan Naval University of Engineering
Beijing Youdian Daxue Xuebao/Journal of Beijing University of Posts and Telecommunications

In order to improve the performance of variable step-size least mean square(LMS)-type algorithm based on Sigmoid function (SVS-LMS) for case of Gaussian and impulsive interference, the method of updating step-size controlled by instantaneous error's power is replaced by adjusting step-size under the control of time-averaged estimate of error autocorrelation. And the Hassab Boucher(HB) weighted method is introduced in the algorithm for restraining the fake peaks of adaptive filter's coefficient vector and the normalized process is introduced for a greater dynamic range of input signal. Simulations of tracking time-varying delay show that, comparing to SVS-LMS algorithm, the algorithm and its HB weighted method can achieve superior mean squared error performance. Source

Pei L.,Academy of Armored force Engineering | Rui Z.,Unit 91635
Proceedings - 2015 7th International Conference on Intelligent Human-Machine Systems and Cybernetics, IHMSC 2015

In order to solve the problem of 3D point cloud data interpretation for the autonomous vehicle avoidance system, based on the analysis of the characteristics of the point cloud data, an analysis method of point grid projection is presented in this paper. This method can effectively obtain the interpretation of the road obstacles from the point cloud data. In this paper, the error and independent point was first analyzed and filtered out. Then road area of interest is divided into grid. Useful points are projected onto the grid and the projection effect would give a comprehensive criterion for interpretation, and location of the road obstacles. The method is verified by experiments and the experimental results show that, this method can effectively assist the autonomous vehicle navigation system to determine the obstacles. © 2015 IEEE. Source

Fu X.,Unit 91635 | Wang R.,Unit 91635 | Hu B.,Unit 91635 | Li Y.,Unit 91635
Guangdian Gongcheng/Opto-Electronic Engineering

According to the special requirements of a large aperture and long focal length optical equipment, better quality of infrared imaging and compact structure was achieved based on Cassegrain optical catadioptric system. Firstly, focal length assignment was calculated. Then, Cassegrain reflect component and infrared component was optimized respectively. Specially, in order to overcome the impact of temperature's change on focal length and image quality, designed three lenses as focus group. Lastly, the main and subordinate lens's hoods were designed to eliminate the influence of stray light. The design results show that the main indexes meet the design requirements. ©, 2015, Chinese Academy of Sciences. All right reserved. Source

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