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Based on the findings from reviewing most Unix textbooks in Chinese universities, we have identified common problems and analyzed their inadequacies, such as the bias of operation system, too many technical terms and inadequate treatment of programming-related content. The discussion about each problem is substantiated with examples, and suggestions are made on possible improvement. This analysis...
This paper presents a novel SINS/GPS tightly integrated navigation algorithm based on Adaptive Extended Kalman Filtering. This algorithm is mainly used in vehicle SINS/GPS integrated navigation system to deal with time varied noise statistic in different working conditions. First, measurement noise covariance is estimated through innovation sequence online, then the covariance matching algorithm is...
In this paper, we proposed a method to fuse data from radar and IR sensor in Extend Kalman probability hypothesis density (EK-GMPHD) filter. Firstly the multi-target is estimated with infrared (IR) sensor using EK-GMPHD filter, and then the filtering results are fused with measurements from radar through sequential filter, in this way, the multi-target state is updated at the tracking system. Under...
Multi-target tracking is an important component of a surveillance, guidance, and obstacle avoidance system. The probability hypothesis density (PHD) filter is an attractive approach to tracking an unknown, and time varying number of targets in the presence of data association uncertainty, clutter, noise, and miss-detection. But there is no closed-form solution to the PHD recursion. Another approach...
Aerial target under the daytime condition shows complex imaging characteristics, like misshapen and blurred edges, even flickering and discontinuous imaging, which becomes a bottleneck of target detection and tracking in imaging tracking system. This paper presents a novel algorithm for detecting and tracking aerial targets with blurred and flickering imagery. Firstly, point spread function (PSF)...
This paper presents a new strategy to speed up the encoding process for fractal image compression. First, the range blocks are obtained by partitioning the image using adaptive quadtrees. Then we extract the high-order spectrum based on nonparametric double-spectrum estimation to constitute the eigenvector for the image block which size is larger than 4??4. The lower dimension kd-tree structure is...
A composite contact materials Ag-SnO2 have been used in low current switching devices for its good anti-welding properties and resistance to arc erosion. But the mass material transfer occurred at large surge current in DC switching now and then. Mass material transfer have an increased probability of early failures because the effective contact gap reduces or two contacts lock together. In this research,...
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