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2015 International Conference on Estimation, Detection and Information Fusion (ICEDIF)最新文献

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Simulation of restrain of radar's multi-path effect 雷达多径效应抑制仿真
G. Zhang
When radar traces the target in low altitude, because of multi-path effect, radar echo wave gets interfered and phenomenon of false alarm or false dismissal occurs, which even can lead to losing target. This paper proposes a separating algorithm that utilizes time-frequency clustering characteristic of Fractional Fourier Transform combing features of multi-path signal. The parameter estimation algorithm based on semi-blind signal processing is also adopted. The paper models the process of blind signal which fits low altitude tracking measurement, solves optimal estimation with simulated annealing algorithm and separates direct wave and reflected wave among multi-path signal to decline multi-path error and increase accuracy of tracking measurements.
雷达在低空跟踪目标时,由于多径效应,雷达回波受到干扰,出现虚警或误解雇现象,甚至可能导致目标丢失。本文提出了一种利用分数阶傅立叶变换的时频聚类特性对多径信号进行梳理的分离算法。采用了基于半盲信号处理的参数估计算法。本文建立了适合低空跟踪测量的盲信号过程模型,采用模拟退火算法求解最优估计,并在多径信号中分离直波和反射波,以减小多径误差,提高跟踪测量精度。
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引用次数: 0
Obstacle classification through acoustic echolocation 基于回声定位的障碍物分类
D. Sampath, G. Wimalarathne
A visually impaired person comes across objects with different attributes in his navigational path, and all of those objects can't be considered as obstacles. One person's obstacle could become a landmark for another. Therefore, getting some insights about the features of the obstacles that come across will provide a significant impact on improving the navigational process of the visually impaired individuals. In this study, a wearable obstacle classification system which extends the currently available obstacle detection approaches using sonar echolocation has been developed. In order to increase the detection range and to improve user-friendliness, an innovative approach based on integration of electronics onto textile environment has been studied. Optimum architecture to embed electronic equipment's and sensors to the textile has been realized. Finally, a smart garment prototype including ultrasonic sensors, coin vibration motors, power supplies and a micro controller has been developed.
视障人士在导航过程中会遇到具有不同属性的物体,这些物体不能都被视为障碍。一个人的障碍可能成为另一个人的里程碑。因此,了解所遇到的障碍物的特征将对改善视障人士的导航过程产生重大影响。本研究开发了一种可穿戴式障碍物分类系统,扩展了现有的声纳回声定位障碍物检测方法。为了增加检测范围和提高用户友好性,研究了一种基于电子与纺织环境集成的创新方法。实现了将电子设备和传感器嵌入织物的优化结构。最后,开发了一种智能服装原型,包括超声波传感器、硬币振动电机、电源和微控制器。
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引用次数: 4
Trust value calculation in domains based on grid environment 基于网格环境的域信任值计算
Wenqing Ma
In order to achieve a reasonable evaluation of direct trust, this paper proposes a trust evaluation algorithm based on the domain, using the technique of constructing a hierarchical tree of trust evaluation subjectively. The algorithm adopts the rules of series and parallel operations in the D-S theory, acquires the results of the recommended trust problem of a single path by quadrature methods and implements the integration of multiple paths by the weighted algorithm which takes the cooperative roles and industry roles as factors. The algorithm can effectively avoid the phenomenon of a single node's weight being too heavy and unfair treatment on recommended resource nodes and realize the trust value computation.
为了实现对直接信任的合理评估,本文提出了一种基于域的信任评估算法,主观上采用了构建信任评估层次树的技术。该算法采用D-S理论中的串并联运算规则,通过正交法获得单路径推荐信任问题的求解结果,并通过以合作角色和行业角色为因素的加权算法实现多路径的集成。该算法可以有效避免单个节点权重过大和对推荐资源节点的不公平处理,实现信任值的计算。
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引用次数: 0
Object detection based on ensemble of exemplars 基于样本集合的目标检测
Luyan Chen, Fuqiao Hu
This paper proposes a detection approach for localizing the object of specific category in images. Based on the ensemble of exemplars, a per-exemplar classifier for each exemplar is learnt, which is simple but powerful to perform well in detecting visually similar objects. Meanwhile, considering the fact that the number of negatives is always considerably larger than that of positives, the method of hard-negatives mining is employed. In addition, using multiple instance learning, we also learn the per-category classifier with inputting the detections produced by per-exemplar classifier in the validation set. The better performance on object detection is boosted further with the contribution of co-occurrence matrices that encodes the relationship of each per-exemplar classifier. In the experiment section, we evaluate the performance of our approach on PASCAL VOC 2007 dataset and compare it to Tomasz's Exemplar-SVM model directly. The experimental result demonstrates that our approach outperforms the Exemplar-SVM model in object detection with higher average precision.
提出了一种定位图像中特定类别物体的检测方法。在样本集合的基础上,为每个样本学习一个单样本分类器,该分类器简单但功能强大,可以很好地检测视觉上相似的目标。同时,考虑到负片的数量总是远远大于正片的数量,采用硬负片挖掘的方法。此外,使用多实例学习,我们还学习了每类别分类器,并将每样本分类器产生的检测输入到验证集中。共现矩阵对每个样本分类器之间的关系进行编码,进一步提高了目标检测的性能。在实验部分,我们评估了我们的方法在PASCAL VOC 2007数据集上的性能,并将其与Tomasz的Exemplar-SVM模型直接进行了比较。实验结果表明,该方法在目标检测方面优于范例-支持向量机模型,具有更高的平均精度。
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引用次数: 0
Robust measurement fusion steady-state Kalman predictor for multisensor uncertain system 多传感器不确定系统鲁棒测量融合稳态卡尔曼预测器
Chunshan Yang, Z. Deng
For the multisensor time-invariant uncertain system with uncertainties of both parameters and noise variances, by introducing a fictitious white noise to compensate the uncertain parameters, the uncertain system can be converted into the system with known parameters and uncertain noise variances. Using the minimax robust estimation principle, and weighted least squares method, a robust weighted measurement fusion Kalman predictor is presented based on the worst-case conservative system with the conservative upper bounds of noise variances. The robustness and robust accuracy relation prove by Lyapunov equation approach. It is prove that it is equivalent to the robust centralized fusion Kalman predictor, and its robust accuracy is higher than that of each local robust Kalman predictor. A Monte-Carlo simulation example shows its correctness and effectiveness.
对于参数和噪声均不确定的多传感器时不变不确定系统,通过引入虚拟白噪声对不确定参数进行补偿,将不确定系统转化为参数已知但噪声不确定的系统。利用极大极小鲁棒估计原理和加权最小二乘法,提出了一种基于噪声方差上界保守的最坏情况保守系统的鲁棒加权测量融合卡尔曼预测器。用李雅普诺夫方程方法证明了鲁棒性与鲁棒精度的关系。证明了它与鲁棒集中式融合卡尔曼预测器等效,且鲁棒精度高于各局部鲁棒卡尔曼预测器。通过蒙特卡罗仿真实例验证了该方法的正确性和有效性。
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引用次数: 0
Deep data fusion model for risk perception and coordinated control of smart grid 面向智能电网风险感知与协调控制的深度数据融合模型
X. Z. Wang, X. Bi, Z. Ge, L. Li
This paper presents a deep data fusion model for risk perception and coordinated control in a regional power system control center. A knowledge learning data fusion approach has been used to find an efficient state representation based on prior knowledge from cross-domain energy management systems. In particular, a kernel principal components analysis technique is presented for nonlinear dimensionality reduction of knowledge learning. The control strategy we study is based on cross-domain global optimization approach, which regards the contingencies and control actions of mutual backup systems as constraints. The objective function is defined as the product of cross-domain assessment and control factors. The method for obtaining optimal solution is given by interior point code. To show the applicability, different machine learning method has been studied. The experimental results show that the proposed knowledge learning approach consistently outperforms the traditional machine learning method. In addition, the proposed coordinated control approach is verified effective on large-scale smart grid decision support system for East China project.
提出了一种区域电力系统控制中心风险感知与协调控制的深度数据融合模型。利用知识学习数据融合方法,从跨域能源管理系统中寻找基于先验知识的高效状态表示。特别提出了一种用于知识学习非线性降维的核主成分分析技术。本文研究的控制策略是基于跨域全局优化方法,将互备份系统的偶然性和控制行为作为约束。目标函数定义为跨域评价和控制因素的乘积。利用内点编码给出了求解最优解的方法。为了证明该方法的适用性,对不同的机器学习方法进行了研究。实验结果表明,所提出的知识学习方法始终优于传统的机器学习方法。最后,在华东项目大型智能电网决策支持系统中验证了所提出的协调控制方法的有效性。
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引用次数: 7
Text detection and recognition in natural scene images 自然场景图像中的文本检测与识别
Xiaoming Huang, Tao Shen, R. Wang, Chenqiang Gao
Text detection and recognition in natural scene images plays an important role in content analysis of images. In this paper, based on the characteristics of scene text, we propose a robust text detection and recognition method using Maximally Stable Extremal Regions (MSER) and Support Vector Machine (SVM). Different from the end to end text recognition, we split the recognition problem into detection and recognition procedure. Firstly, in the detection stage, in order to extract potential text as much as possible, we use MSER and color clustering to extract connected component. Then, for the obtained candidate connected component, we use visual saliency and some prior information to filter non-text regions. Finally, we can obtain word image by text line generation. In the recognition stage, we use vertical projection to segment word images, then recognize character in SVM based framework. The experiment results evaluated on standard dataset show that with a small amount of prior information and simple segment strategy, the proposed method has a better performance compared to conventional text detection and recognition method.
自然场景图像中的文本检测与识别在图像内容分析中起着重要的作用。本文基于场景文本的特点,提出了一种基于最大稳定极值区域(MSER)和支持向量机(SVM)的鲁棒文本检测与识别方法。与端到端文本识别不同,我们将识别问题分为检测过程和识别过程。首先,在检测阶段,为了尽可能多地提取潜在文本,我们使用MSER和颜色聚类来提取连接成分。然后,对于得到的候选连接分量,我们使用视觉显著性和一些先验信息来过滤非文本区域。最后,通过文本行生成得到文字图像。在识别阶段,我们使用垂直投影对词图像进行分割,然后在基于支持向量机的框架下进行字符识别。在标准数据集上的实验结果表明,与传统的文本检测和识别方法相比,该方法具有较少的先验信息和简单的分割策略,具有更好的性能。
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引用次数: 11
Sonic transmission research of geosteering drilling tools 地质导向钻井工具的声波传输研究
Xicao Xie, Chao Sun
In geosteering drilling technology, the transmission of information measured by near-bit sensor has always been a problem. Downhole drilling tool is a very complex medium for sonic transmission. This paper takes geosteering drilling tool as the study object, and puts forward a method of short distance transmission, which is based on sonic wave transmission theory. The experiment testing the drilling pipes sonic transmission characteristics in the laboratory is done. This paper analyzes the sensitivity of sonic wave to some parameters when it acts as carrier. These parameters include the position of the excitation signal, the frequency of the excitation signal, the amplitude of the excitation signal and the position of the response signal. The strength of the propagated sonic signal would be weakened or strengthened because of reflection wave and multipath, but the data transmission is feasible by sonic wave underground short distance.
在地质导向钻井技术中,近钻头传感器测量的信息传输一直是一个难题。井下钻具是一种非常复杂的声波传输介质。本文以地质导向钻具为研究对象,提出了一种基于声波传输理论的短距离传输方法。在实验室对钻杆的声波传输特性进行了测试。本文分析了声波作为载波时对某些参数的灵敏度。这些参数包括激励信号的位置、激励信号的频率、激励信号的幅值和响应信号的位置。由于反射波和多径的作用,声波信号的传播强度会减弱或增强,但利用声波在地下短距离传输数据是可行的。
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引用次数: 0
The double chaotic particle swarm optimization with the performance avoiding local optimum 避免局部最优性能的双混沌粒子群优化算法
Guiying Li, Y. Zhigang
The research with respect to Particle Swarm Optimization is concentrated in improving their performance on avoiding local maxima. Since standard Particle Swarm Optimization does not perform well in many cases, we propose double chaotic particle swarm optimization algorithm based on logistic map. This chaotic movement has good randomness and ergodic statistics property of chaos sequence. We propose to use chaotic sequence to initialize the particle positions, laying a solid foundation for the diversity of search particle swarm. The improved strategies in the algorithm increase the premature stagnation judgment that the new particles are added into a new region making changes in the trajectory of particles, which help algorithm escaping from local optima effectively and reduce invalid iterations. This strategies result in greatly improving the convergence of the algorithm, accuracy and speed optimization. On the other hand, the proposed algorithm requires very little number of particles and few iterations to fully meet the theory test function optimization. The results of the simulation show the good performance of the optimization algorithm.
关于粒子群算法的研究主要集中在提高粒子群算法避免局部极大值的性能上。针对标准粒子群算法在很多情况下性能不佳的问题,提出了基于logistic映射的双混沌粒子群算法。这种混沌运动具有良好的随机性和混沌序列的遍历统计性。我们提出用混沌序列初始化粒子位置,为搜索粒子群的多样性奠定了坚实的基础。改进后的算法增加了将新粒子加入新区域的过早停滞判断,改变了粒子的轨迹,有助于算法有效地脱离局部最优,减少无效迭代。该策略大大提高了算法的收敛性、精度和优化速度。另一方面,所提出的算法所需的粒子数量和迭代次数很少,可以完全满足理论测试函数的优化要求。仿真结果表明了优化算法的良好性能。
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引用次数: 2
Projective iterative hard thresholding algorithm for sparse signal recovery 稀疏信号恢复的投影迭代硬阈值算法
Zhong Zhou, Tao Sun, Lizhi Cheng
Recovering sparse signals from a few linear measurements is attracting growing attention. Bsides sparsity, the signals usually are nonnegative, nonpositive or restricted in some domain. This paper proposes an algorithm for recovering the sparse signal with some certain property on learning the sparsity. We propose this algorithm by combining the projective method with the iterative hard thresholding strategy. We prove that this algorithm is linear convergent provided the sensing matrix has suitable property. Numerical results demonstrate the efficiency of the algorithm.
从一些线性测量中恢复稀疏信号正引起越来越多的关注。除了稀疏性之外,信号通常是非负的、非正的或在某些域中受限的。提出了一种通过学习稀疏性来恢复具有一定性质的稀疏信号的算法。我们将投影法与迭代硬阈值策略相结合,提出了该算法。我们证明了该算法是线性收敛的,只要感知矩阵具有合适的性质。数值结果表明了该算法的有效性。
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引用次数: 1
期刊
2015 International Conference on Estimation, Detection and Information Fusion (ICEDIF)
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