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In order to eliminate bad influence caused by parameter uncertainties and external disturbances in spacecraft tracking system, a higher-order sliding mode control strategy is proposed in this paper. Attitude control system is divided into fast loop and slow loop based on singular perturbation. The sign function is replaced by the norm-type switching function for the continuous virtual control in the...
Synthesis sparsity model received great attention in the past decade. Signal reconstruction based analysis model appears recently and has a high accurate reconstruction rate., which constitutes a solid basis for practical applications. In this paper, we transform the sparse signal reconstruction issue of synthesis model to an analysis one with some additional restraints. Therefore the existing algorithms...
Device-to-Device (D2D) communications in cellular systems have a lot of potential value for both commercial and public safety (PS) applications. In D2D communications, two or more devices exchange data using a direct communication link, i.e., without having to go through the network infrastructure. This paper focuses on the study of broadcast voice communication for PS and the resource allocation...
Direct Device-to-Device (D2D) communications in cellular systems has attracted a lot of interest for both commercial and public safety applications. To support D2D communications, a first step involving neighbor discovery is typically needed. This paper focuses on the study of neighbor discovery signal design aspects and interference management for D2D discovery under a typical LTE system deployment...
In order to remove the noise of sonar image more effectively, the adaptive over complete dictionary based on K-SVD algorithm is carried out in this paper. Given a set of training signals from noisy image, the predefined dictionary is trained so that the new dictionary leads to the best sparse representation for sonar image, but not for the noise. Experiments are provided to demonstrate the performance...
The change points exist in the failure process of software. The number and locations of change points produce significant influence on software reliability estimation, but now there is no effective way to estimate accurately. Therefore, this paper proposes a new method of change points estimation. According to the control chart of software failure data and the proposed judgment criteria of change...
Geomagnetic anomaly filed is a typical two-dimensional irregular dataset, and high-accuracy map is vital foundation of geomagnetic navigation. Traditional interpolating method could be classified into two categories, one is constructing smooth curve or surface through reference points, and another assign different weights on reference points to make estimation. ICSS (Interpolation and Correction step-by-step)...
Community structure is an important topological property of complex networks and community detection has become a common methodology to understand the organization and function of various complex networks. Label propagation is an extremely fast algorithm with near linear time complexity and it is applicable to large-scale networks. In spite of the advantages of label propagation, the issue of the...
According to underwater terrain characteristic, the multi-index synthetic evaluation theory is used for calculating matching area of an underwater terrain-aided navigation system in this paper. Considering the terrain elevation standard deviation, roughness, terrain correlation coefficient, topographic information entropy and other crucial terrain characteristic parameters on the effect of navigation...
Reed-Solomon (RS) coding and interleaving are usually combined to protect digital subscriber line (DSL) systems against impulse noise (IN) but introducing a long delay. It is proved that interleaving delay can be significantly reduced by error and erasure decoding (EED). This paper proposes an erasure marking technique to enhance the reliability of the erasure information in order to completely exploit...
Due to long-term exploration with insufficient conservation, the resources and environment in Heilongjiang state farms (HSFs) have been impacted and influenced to some extent. However, the environmental problem of HSFS has received minimum attention, so it is very important to evaluate the environmental production efficiency and the productivity of HSFs. In this article, methods of Data Envelopment...
In this paper, we model the robust hash authentication from the authentication code space view. In the authentication code space, the reception domain, authentication domain and near-x domain is defined, and the two error probability is derived. Based on the two error probabilities, the formalized definition of robustness and sensitivity is given and the inherent tradeoff between them is also analyzed...
The task of path planning for aircraft has received considerable attention in the research literature. The problem involves computing a collision-free path between a start point and a target point in environment of known obstacles. In this paper, we investigate an obstacle avoidance path planning problem using the MAKLINK graph theory and multi ant colony system, in which several colonies of ants...
Considering the different characters of ROAM algorithm and quadtree algorithm, a new multi-resolution level of detail (LOD) model for large-scale terrain real-time display is presented in this paper. Based on easy realized QuadTree algorithm, the partitioning strategy of ROAM is adopted, and then a new view to model distance computational method is defined. Meanwhile, a refinement method for filling...
A novel method for the robot path planning in dynamic environment is presented in this paper. Based on the analysis of visual modeling, the reason of premature convergence and diversity loss in PSO is explained, and a new modified algorithm is proposed to ensure the rational flight of every particle dimensional component. Meanwhile, two parameters of particle-distribution-degree and particle dimension-distance...
A 3D human tracking method based on particle filter is introduced in this paper. In this method, firstly the face area of the human is extracted based on a skin model and template matching with standard human face from recorded 2-D video images. Then 2-D face positions in the video images are converted to 3-D world coordinates through the calibration parameters. Finally these 3-D position estimates...
In this paper, the method of data fusion in decision making base on the transferable belief model (TBM) in the occupancy grid map building is presented. The TBM is shown to provide a powerful and flexible framework, well suited to this problem. The basic belief assignment can be calculated in each condition, so the belief and plausibility function can be built. After analyzing the conditions in each...
In this paper, an improved algorithm of node refinement scheme called endpoint triangle's circumcircle method (ETCM) is proposed, which has linear time complexity. Regarding stability, new nodes quantity, time cost and mesh quality as criterions, ETCM and existing node refinement algorithms are evaluated by simulations. The results show that the time cost of ETCM is more independent of data distribution...
A new variable tap-length LMS algorithm is proposed, in which the error width is made variable rather than fixed. A changing factor is defined to satisfy the change requirement of the error width. Simulations are performed under both low noise and high noise conditions with different error widths, which show that the proposed algorithm can converge fast and at the same time obtain a small steady state...
The same real world objects are often repeatedly gathered by different departments, which may lead to data ambiguity. To resolve it, adjusting is a key step which is defined as making different representation of matching objects consistent. Previous methods adjust one map directly without considering the influence caused by the point features from the second map, which certainly brings some error...
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