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

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Fusion estimation for multi-sensor stochastic systems with unknown inputs and one-step random delays 具有未知输入和一步随机延迟的多传感器随机系统的融合估计
Chongyan Pang, Shuli Sun
This paper studies the distributed fusion filtering problem for multi-sensor stochastic systems with unknown inputs and one-step random delays. By defining some new variables, the original system with unknown inputs and random delays is equivalently transformed into a stochastic parameterized system. The time-delay is depicted by a Bernoulli distributed random variable. No prior information about unknown inputs is available. A Kalman-form distributed fusion filter (DFF) independent of unknown inputs is presented based on the linear unbiased minimum variance criterion. The filtering error cross-covariance matrices between any two local filters are derived. A simulation explains the effectiveness of the algorithms.
研究了具有未知输入和一步随机时滞的多传感器随机系统的分布式融合滤波问题。通过定义一些新的变量,将具有未知输入和随机时滞的原始系统等效地转化为随机参数化系统。时延用伯努利分布随机变量表示。没有关于未知输入的先验信息。基于线性无偏最小方差准则,提出了一种不依赖于未知输入的卡尔曼型分布式融合滤波器。导出了任意两个局部滤波器之间的滤波误差交叉协方差矩阵。仿真说明了算法的有效性。
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引用次数: 2
Design of a capacitive liquidometer applied in automobile 汽车用电容式液位计的设计
Qingliang Zhang
The measurement methods of liquid level are summarized. A cylindrical tube capacitive liquidometer consisting of two tubes is produced. Arithmetic relationship between the liquid level and the capacitance is derived. AD7746 is used to convert the capacitance signal into voltage signal. The voltage signal is then processed by PIC16F877 microcontroller and digitally displayed by the circuit of 1602. It is stated that sensor errors lie in manufacture, structure, and liquid temperature changes. The corresponding solutions are put forward. The calibration is carried out on the instrument to compare the values of the standard capacitance and calculated capacitance and test results are given.
对液位的测量方法进行了总结。研制了一种由两根管组成的圆柱形管电容式液体计。推导了液面与电容之间的算术关系。AD7746用于将电容信号转换为电压信号。电压信号经PIC16F877单片机处理后,由1602电路数字显示。指出传感器误差存在于制造、结构和液体温度变化等方面。并提出了相应的解决方案。对仪器进行了标定,比较了标准电容值和计算电容值,并给出了测试结果。
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引用次数: 4
An approximate calculation for error spectrum 误差谱的近似计算
Weishi Peng, Yang-wang Fang, Shaohua Chen
As a comprehensive measure, the error spectrum will be widely used for estimation performance evaluation. However, it's hard to calculate without the error distribution. An approximate algorithm is proposed in this study to solve this problem. Then, how the approximate calculation can be used is illustrated by numerical examples. Finally, the correctness of the algorithm is validated by the simulation results.
误差谱作为一种综合度量,将广泛用于估计性能评价。但是,如果没有误差分布,很难进行计算。本文提出了一种近似算法来解决这一问题。然后,通过数值算例说明了近似计算的应用。最后,通过仿真结果验证了算法的正确性。
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引用次数: 3
An effective pansharpening method for WorldView-2 satellite images 一种有效的WorldView-2卫星图像泛锐化方法
Xu Li, Weifeng Qi
Pansharpening has been an important tool in remote sensing applications, which transforms a set of low-spatial-resolution multispectral images to high-spatial-resolution images by fusing a co-registered fine-spatial-resolution panchromatic image. The new style very high-resolution WorldView-2 satellite images have posed challenges to the image fusion techniques. An effective pansharpening method based on correspondence analysis is presented in this paper. The experimental results show that the presented method can effectively obtain a better trade-off between the spectral fidelity and the spatial resolution enhancement compared to some existing methods.
泛锐化是将一组低空间分辨率的多光谱图像融合成高空间分辨率的全色图像,是遥感应用中的一种重要工具。新型高分辨率的WorldView-2卫星图像对图像融合技术提出了挑战。提出了一种有效的基于对应分析的泛锐化方法。实验结果表明,与现有方法相比,该方法可以有效地在光谱保真度和空间分辨率增强之间取得更好的平衡。
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引用次数: 4
Wavelet transform-based downsampling for low bit-rate video coding 基于小波变换的低比特率视频编码下采样
Kankan Zheng, L. Zhang, Rong Xie
Video coding has been a very hot area of research for a long time. The latest standard High Efficiency Video Coding (HEVC) outperforms H.264 a lot and needs only half of bit-rate to obtain the same performance. However HEVC is designed for high definition video such as 1080p and above. The high compression rate calls for high complexity, which limits the application in some low bandwidth and low complexity conditions. In this paper, an idea of wavelet transform-based downsampling scheme for intra mode is used before HEVC coding to ensure the bandwidth for low frequency content of video in low bit-rate condition. Furthermore the downsampled size of video can reduce the complexity of HEVC encoding procedure to only a quarter of the original size. To make the performance better, we also allocate bandwidth for high frequency content. Bit-plane encoding with frame partition is used to encode the high frequency coefficients efficiently. Bit-plane encoding scheme encodes big data first so that the high frequency content can be transmitted in an arbitrary truncated bitstream. Frame partition uses fewer bits to encode more coefficients. Simulation results of intra mode coding are presented to show the advantage of our algorithm. The proposed wavelet transform-based downsampling scheme reduces the complexity of HEVC. Together with high frequency coefficients encoding, our algorithm can perform similar coding performance as HEVC.
视频编码一直是一个非常热门的研究领域。最新标准的高效视频编码(High Efficiency Video Coding, HEVC)大大优于H.264,并且只需要一半的比特率就可以获得相同的性能。然而,HEVC是为1080p及以上的高清视频而设计的。高压缩率要求高复杂度,这限制了在一些低带宽、低复杂度条件下的应用。为了保证低比特率条件下视频低频内容的带宽,本文在HEVC编码前采用了基于小波变换的帧内下采样方案。此外,压缩后的视频尺寸可以将HEVC编码过程的复杂度降低到原始尺寸的四分之一。为了提高性能,我们还为高频内容分配了带宽。采用帧分割的位平面编码方式对高频系数进行有效编码。位平面编码方案首先对大数据进行编码,使得高频内容可以在任意截断的比特流中传输。帧分割使用更少的比特来编码更多的系数。最后给出了模内编码的仿真结果,证明了该算法的优越性。提出的基于小波变换的下采样方案降低了HEVC的复杂度。结合高频系数编码,该算法具有与HEVC相似的编码性能。
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引用次数: 0
Partial discharge type recognition for transformers based on Fisher discriminant method 基于Fisher判别法的变压器局部放电类型识别
Li Li, Yongli Zhu, Min Lu, Liuwang Wang, Ya-qi Song
Towards the problem of low rate of partial discharge (PD) recognition caused by lack of effective train samples, Fisher discriminant method is applied to improve recognition rate of PD for transformer. The discharge data produced by four PD models is collected, from which forty-four statistical characteristics are extracted. In order to solve the problem of singular matrix due to the high dimension, an effective dimension-reduced strategy is put forward. Forty-four characteristics are divided into seven low-dimensional subgroups, which become the input data for seven classifiers constructed by Fisher discriminant method. The PD type of the test samples is identified as that voted by results of seven classifiers. Results show that, in contrast to the back-propagation network method, the proposed method is more stable and possesses higher recognition rate under the condition of limited training samples, thus with good practical values.
针对缺乏有效训练样本导致局部放电识别率低的问题,采用Fisher判别法提高变压器局部放电识别率。收集了4种PD模型产生的放电数据,从中提取了44个统计特征。为了解决高维矩阵的奇异性问题,提出了一种有效的降维策略。44个特征被划分为7个低维子组,这些子组成为由Fisher判别法构建的7个分类器的输入数据。测试样本的PD类型由七个分类器的结果投票确定。结果表明,与反向传播网络方法相比,该方法在训练样本有限的情况下具有更高的识别率和稳定性,具有较好的实用价值。
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引用次数: 0
Thermal optimization design of high-power LED fin-tubular radiator 大功率LED翅片管式散热器的热优化设计
Xue Ping, Wei Shuhui, Wang Zhongjie
For the problem of the high power LED heat radiator cooling slowly and having a higher temperature, it will affect the service life of the LED. Studying thermal characteristics of the different power of fin-tubular radiator temperature field distribution and heat flux vector distribution of lamps and lanterns. According to heat transfer knowledge, we make a qualitative analysis of the heat dissipation theory and control equation of natural convection with the complicated and changeable environment factors. Combined with the structure property of the radiator, we put forward an optimization design scheme of fin-tubular heat radiator with the aid of a kind of method to estimate the temperature. Taking Sunflower radiator for example, we completed the numerical analysis of the theoretical estimation by using the method of experiment and ansys simulation. And we make a quantitative analysis of the heat dissipation area and heat transfer coefficient on the temperature field distribution and the distribution of the heat flux vector, verify the reliability and accuracy of the temperature estimation method, and optimizing the design scheme of fin-tubular radiator has better heat dissipation performance.
对于大功率LED散热器散热慢,温度较高的问题,会影响LED的使用寿命。研究了不同功率翅片管式散热器灯具的热特性,温度场分布和热流密度矢量分布。根据传热学知识,对环境因素复杂多变的自然对流散热理论和控制方程进行了定性分析。结合散热器的结构特点,利用一种温度估算方法,提出了翅片管式散热器的优化设计方案。以向日葵散热器为例,采用实验和ansys仿真相结合的方法完成了理论估算的数值分析。并定量分析了散热面积和换热系数对温度场分布和热流密度矢量分布的影响,验证了温度估算方法的可靠性和准确性,优化后的翅片管式散热器设计方案具有更好的散热性能。
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引用次数: 0
Characteristics analysis of wind farms for participating frequency regulation in Jilin power grid 吉林电网风电场参与调频特性分析
Su Xunwen, Song Haiming, L. Yunbo, X. Dianguo
This paper presents the characteristics analysis of wind farm to the participation of power grid frequency regulation. Wind farm is built by equivalent modeling method, and contains full-converter wind turbine generators (WTG) with Wind Turbine of Direct-Drive Permanent Magnet Synchronous Generator (DDPMSG). At first, model and control strategy of WTG with PMSG is introduced. Then single-machine equivalent model is elaborated. The control model of WTG with PMSG is built to reflect frequency adjustment. Combined with Jilin power grid data, wind farms are built on software of DIgSILENT/Power Factory platform. Output Characteristic of wind farm is analyzed under load shedding. Results show that control technology of the DDPMSG is suitable for contribution to grid frequency response.
本文对风电场参与电网调频的特点进行了分析。采用等效建模方法构建风电场,其中包含全变换器风力发电机(WTG)和直驱永磁同步发电机(DDPMSG)风力发电机。首先介绍了带PMSG的WTG模型和控制策略。然后阐述了单机等效模型。建立了带PMSG的WTG控制模型,以反映频率调节。结合吉林电网数据,在DIgSILENT/ power Factory平台软件上构建风电场。分析了风电场在减载条件下的输出特性。结果表明,DDPMSG控制技术适合于对电网频率响应的贡献。
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引用次数: 0
An improved permutation alignment algorithm for convolutive mixture of radar signals 一种改进的雷达信号卷积混合排列对齐算法
Lin Li, Li Jiang, Yichuang Zhang
The convolutive blind source separation (BSS) problem can be solved in frequency domain. To solve the permutation ambiguity problem in frequency domain, this paper presents an improved permutation alignment algorithm. According to features of radar signals, first the frequency domain is divided to some region segmentations. Then the permutation alignment is performed in each region independently. Finally, we fuse all of the regions and estimate the frequency point of the signal with incorrect separation. This algorithm overcomes the problem that the incorrect permutation of a frequency point will influence subsequent frequency points. The simulation results demonstrate the effectiveness and validity of the proposed method.
卷积盲源分离(BSS)问题可以在频域得到解决。为了解决频域上的排列模糊问题,提出了一种改进的排列对齐算法。根据雷达信号的特点,首先将频域分割成若干区域分割。然后在每个区域独立进行排列比对。最后,我们融合了所有的区域,并估计了不正确分离的信号的频率点。该算法克服了一个频率点的错误排列会影响后续频率点的问题。仿真结果验证了该方法的有效性。
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引用次数: 0
Reach on the personal information circulation and its legal protection in electronic commerce 论电子商务中个人信息的流通及其法律保护
Y. Ye
With the fast development of international internet and information technology, the contradiction between the personal information circulation and the personal information legal protection is getting more and more serious. In order to solve the problem about the personal information circulation and its legal protection, firstly catch the meaning of the personal information circulation and its legal protection. Secondly master the methods of ensuring the security of account passwords. At last take such measures as strengthening self-discipline of the merchants from their own perspectives, strengthening the self-protection of consumers from their own perspectives, strengthening legal education propaganda from governments' perspectives and so on. By means of these methods, the governments in China will keep the personal information circulation and its legal protection going smoothly.
随着国际互联网和信息技术的快速发展,个人信息流通与个人信息法律保护之间的矛盾日益严重。要解决个人信息流通及其法律保护问题,首先要搞清个人信息流通及其法律保护的含义。其次掌握保证账户密码安全的方法。最后采取从商家自身角度加强自律、从消费者自身角度加强自我保护、从政府角度加强法制教育宣传等措施。通过这些方法,中国政府将保持个人信息流通及其法律保护的顺利进行。
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引用次数: 0
期刊
2015 International Conference on Estimation, Detection and Information Fusion (ICEDIF)
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