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2016 2nd International Conference on Control Science and Systems Engineering (ICCSSE)最新文献

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Designing a cognitive radio with enhancement in throughput and improved spectrum sensing technique 设计一种提高吞吐量和改进频谱感知技术的认知无线电
P. Dutta, G. C. Manna
An important advantage of cognitive radio is its ability to use the licensed frequency spectrum which is being utilized by the primary users. CR has two major roles viz. sensing and throughput optimization. In contrary to conventional methods of sensing viz. cyclostationarity, matched filter detection, maximum to minimum eigen value method etc., spectrum sensing has been improved by implementing Peak vs Average Power Ratio of the received signal in energy detection in the presentation. It has the additional advantages that prior information of the license user is not required and it is free from noise uncertainty. In this paper, the design of the frame for MAC layer has been based on Wireless spectrum Sensing network (WSSN). The access of the channel to the secondary users is done through Handshaking Algorithm. A hybrid frame structure based on CSA and DSA has been devised for the WSSN network and has been implemented which overcomes the drawback of Conventional frame format. The WSSN network removes the sensing time from the Secondary user's frame thereby increasing the transmission time of data and hence the throughput of the system. The cognitive radio frame structure, thus designed in the present paper, improves the throughput of the system and enhance the Spectrum sensing techniques. Finally, the simulation results shows that the proposed method performs better than the conventional method in throughput and provides efficient spectrum sensing technique.
认知无线电的一个重要优点是它能够使用主要用户正在使用的许可频谱。CR有两个主要作用,即感知和吞吐量优化。与传统的感知方法,即循环平稳性,匹配滤波器检测,最大到最小特征值方法等相反,频谱感知通过在能量检测中实现接收信号的峰值与平均功率比而得到改进。它还具有不需要许可证用户的先验信息和不受噪声不确定性影响的优点。本文以无线频谱传感网络(WSSN)为基础,设计了MAC层的帧。通过握手算法实现对二级用户的通道接入。针对wsn网络设计并实现了一种基于CSA和DSA的混合帧结构,克服了传统帧格式的缺点。wsn网络从次要用户的帧中去掉了感知时间,从而增加了数据的传输时间,从而提高了系统的吞吐量。本文设计的认知无线电帧结构提高了系统的吞吐量,增强了频谱感知技术。最后,仿真结果表明,该方法在吞吐量上优于传统方法,提供了高效的频谱感知技术。
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引用次数: 4
Novel hybrid of strong tracking Kalman filter and improved radial basis function neural network for GPS/INS integrated navagation 基于强跟踪卡尔曼滤波和改进径向基神经网络的GPS/INS组合导航
X. Tian, Chengdong Xu
Aiming to improve positioning precision of the GPS/INS integrated navigation system during GPS outages, a novel model combined with strong tracking Kalman filter (STKF) and improved Radial Basis Function Neural Network(IRBFNN) algorithms is proposed and tested. STKF is used to estimate INS errors as a replacement of Kalman filter (KF), and IRBFNN is trained based on STKF when GPS works well and applied to predict INS errors during GPS outages. In the IRBF neural network, the width of the hidden layer and kernel function are optimized by using genetic algorithm to obtain a high precision generalization ability of RBF network structure. The simulation indicate that the proposed model can effectively provide high accurate corrections to the standalone INS during GPS outages.
为了提高GPS/INS组合导航系统在GPS中断时的定位精度,提出了一种结合强跟踪卡尔曼滤波(STKF)和改进径向基函数神经网络(IRBFNN)算法的新模型并进行了测试。利用STKF代替卡尔曼滤波(KF)估计惯导系统误差,在GPS工作良好时基于STKF训练IRBFNN,并将其应用于GPS中断时的惯导系统误差预测。在IRBF神经网络中,采用遗传算法对隐层宽度和核函数进行优化,获得了RBF网络结构的高精度泛化能力。仿真结果表明,该模型能有效地在GPS中断时对独立惯性导航系统进行高精度修正。
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引用次数: 4
Study on control method of activated sludge sewage treatment system 活性污泥污水处理系统控制方法研究
Zhang Xu, Xiao Cheng
This paper mainly studies the control algorithm based on activated sludge sewage treatment system. First of all, use activated sludge 1 model (ASM1) as development platform and establish a simplified mathematical model of activated sludge. The model describes the growth and decay process of Aerobic heterotrophic bacteria, the components of model, the reaction process and the number of parameters are less than ASM1, so that the model's usefulness in municipal waste water treatment plant is improved. The determination of components, chemical measurement model coefficients and dynamic parameters provide an important premise and foundation. for the application of the model. Second, simulate and research on established the simplified model, in order to improve the control effect, this paper use the state feedback controller. Finally, the method is verified that it is useful to improve and enhance the performance of the sewage treatment system by comparison and analysis.
本文主要研究了基于活性污泥污水处理系统的控制算法。首先,以活性污泥1模型(ASM1)为开发平台,建立了活性污泥的简化数学模型。该模型描述了好氧异养菌的生长和衰变过程,模型的组成、反应过程和参数数量均少于ASM1,从而提高了模型在城市污水处理厂中的实用性。组分、化学测量模型系数和动力学参数的确定提供了重要的前提和基础。对于模型的应用。其次,对建立的简化模型进行仿真研究,为了提高控制效果,本文采用状态反馈控制器。最后,通过对比和分析,验证了该方法对改善和提高污水处理系统的性能是有用的。
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引用次数: 0
An edge-detection method based on adaptive canny algorithm and iterative segmentation threshold 一种基于自适应canny算法和迭代分割阈值的边缘检测方法
Song Qiang, Lin Guoying, Ma Jing-qi, Z. Hongmei
In the technology of crack detection, the traditional Canny algorithm uses fixed spatial scale coefficient of Gauss filter and empirical values of the high and low thresholds, and it has defective in self-adaptability because it is unable to correct parameters according to the actual image. This paper proposes a method based on adaptive Canny algorithm and iterative threshold segmentation algorithm to detect surface crack. Firstly, in the process of image smoothing, the adaptive Canny algorithm automatically calculates difference between the gray value of present pixel and the average gray value of image in the filter window, and the difference is set as the spatial scale coefficient for Gauss filter of the current pixel. Secondly, the Otsu method is applied to calculate image gradient histogram so as to get high and low thresholds and those new values are applied to detect the edge of the crack. Finally, based on the iterative threshold segmentation algorithm, the image with crack is binarized, and the breakpoints in the crack and the cavities inside the crack are eliminated by morphological dilation. Experimental results show that the new crack detection method can well retain crack edge and get better effect on noise cancellation. It can also reduce the false and missed detections. Better results can be achieved on crack detection.
在裂纹检测技术中,传统的Canny算法采用固定的高斯滤波器空间尺度系数和高低阈值的经验值,无法根据实际图像校正参数,存在自适应性不足的问题。提出了一种基于自适应Canny算法和迭代阈值分割算法的表面裂纹检测方法。首先,在图像平滑过程中,自适应Canny算法自动计算当前像素的灰度值与滤波窗口内图像平均灰度值的差值,并将差值作为当前像素高斯滤波的空间尺度系数;其次,利用Otsu方法计算图像梯度直方图,得到高、低阈值,并利用这些新值检测裂纹边缘;最后,基于迭代阈值分割算法,对裂纹图像进行二值化处理,通过形态扩张消除裂纹中的断点和裂纹内的空洞。实验结果表明,新的裂纹检测方法能很好地保留裂纹边缘,并取得较好的消噪效果。它还可以减少误检和漏检。在裂纹检测上取得了较好的效果。
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引用次数: 23
A bandwidth adaptive pseudo-code tracking loop design for BD/INS integrated navigation BD/INS组合导航的带宽自适应伪码跟踪环路设计
Chun-Li Liu, Cheng Wang, Jing Wang
In modern Beidou satellite communications receivers, a simple pseudo-code tracking loop has been unable to meet pseudo-code synchronization in high dynamic, strong interference environments. In such environment, the traditional combinations cannot make pseudo-code tracking loop to achieve optimal performance, thus the integrated navigation has become a development direction. In this paper, an error estimation module has been added based on the traditional BD/INS integrated navigation system. The module uses time from integral accumulator and the signal to noise ratio and acceleration from initial data module estimating the minimum tracking error of pseudo-code tracking loop. The bandwidth selection signals generate by the module feedback to the initial data processing module adjusting the bandwidth in the initial data processing module. The design makes the pseudo-code tracking loop adjust bandwidth in real time based on high dynamic environmental conditions, so it will enhance environmental adaptability of the pseudo-code tracking loop and improve the performance of the pseudo-code tracking loop.
在现代北斗卫星通信接收机中,简单的伪码跟踪环已经无法满足高动态、强干扰环境下的伪码同步。在这样的环境下,传统组合无法使伪码跟踪环路达到最优性能,因此组合导航成为一个发展方向。本文在传统BD/INS组合导航系统的基础上,增加了误差估计模块。该模块利用积分累加器的时间和初始数据模块的信噪比和加速度来估计伪码跟踪环路的最小跟踪误差。所述模块产生的带宽选择信号反馈给所述初始数据处理模块,调节所述初始数据处理模块中的带宽。该设计使伪码跟踪回路基于高动态环境条件实时调整带宽,增强了伪码跟踪回路的环境适应性,提高了伪码跟踪回路的性能。
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引用次数: 0
Multi-frequency and multi-segment bio-impedance measurement using tetra-polar electrode setup 利用四极电极装置进行多频率、多段生物阻抗测量
D. K. Kamat, P. M. Patil
A multi-frequency portable bio-impedance measurement system used for whole human body and segmental body impedance measurements is presented in this paper. Digital signal processor is the core of the measurement system used for injecting alternating current into human body and also for sensing and analyzing the voltage developed in response to the injected current. Tetra-polar electrode setup is employed for bio-impedance measurement. Bio-impedance measurements are performed at logarithmic frequencies in the range between 18 kHz to 576 kHz. Impedance magnitude and phase show similar trend for whole body and segmental bio-impedance measurements.
介绍了一种多频便携式人体阻抗测量系统,该系统可用于人体全身和节段阻抗测量。数字信号处理器是将交流电注入人体的测量系统的核心,也是检测和分析交流电注入后产生的电压的核心。生物阻抗测量采用四极电极装置。生物阻抗测量是在18千赫到576千赫的对数频率范围内进行的。阻抗幅值和相位在全身和节段生物阻抗测量中表现出相似的趋势。
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引用次数: 1
Study on designated verifier proxy signature schemes with provable security 具有可证明安全性的指定验证者代理签名方案研究
Xiaoming Hu, Yinchun Yang, Xiaojun Zhang, Huajie Xu, Jian Wang
This Proxy signature has been one of the hot spot in cryptography research as it can delegate the signing right of the original signer to the proxy signer. Therefore, it is applied in many areas such as mobile networks, distributed systems, control systems and other some information systems. Recently, many proxy signature schemes with special properties have been proposed. However, most of them is been proved to be insecure or inefficient. In this paper, we study two efficient proxy signature schemes proposed recently with special property, i.e. blind property and designated verifier property respectively. We point out that there exist some security drawbacks in the both schemes, including the replace problem of delegation warrant, the forgeability problem from the proxy signer and the forgability problem from the normal user. In order to overcome these problems, we propose a solution method for each scheme. Thus, these both improved schemes are securer than original both schemes, which makes them more suitable for applying.
代理签名将原始签名者的签名权委托给代理签名者,已成为密码学研究的热点之一。因此,它被应用于许多领域,如移动网络、分布式系统、控制系统和其他一些信息系统。近年来,人们提出了许多具有特殊性质的代理签名方案。然而,它们中的大多数已被证明是不安全或低效的。本文研究了最近提出的两种高效代理签名方案,它们分别具有盲性和指定验证者性。指出这两种方案都存在一些安全缺陷,包括授权凭证的替换问题、代理签名者的可伪造性问题和普通用户的可伪造性问题。为了克服这些问题,我们对每个方案提出了求解方法。因此,这两种改进方案都比原来的两种方案更安全,更适合应用。
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引用次数: 0
Switch-based adaptive nonsingular sliding mode control for spacecraft formation flying 基于开关的航天器编队飞行自适应非奇异滑模控制
Ting Wang, S. Zhou, Yueyong Lv, Dongyu Li
This paper investigates the relative position control problem for a two-agent spacecraft formation. The modified nonlinear dynamic based on C-W equation is adopted to describe relative position between the leader and follower. Considering the system uncertainty and external disturbance, adaptive sliding mode control laws based on linear and terminal sliding surface are proposed respectively. In addition, a switching mechanism is employed to make a selection between the general and terminal surfaces so as to avoid singularity. The convergence of closed-loop system is proved by Lyapunov stability theory. Numerical simulations illustrates the validity of the control law proposed.
研究了双智能体航天器编队的相对位置控制问题。采用基于C-W方程的修正非线性动力学来描述领导者和追随者之间的相对位置。考虑系统的不确定性和外部干扰,分别提出了基于线性和末端滑动面的自适应滑模控制律。另外,采用切换机构在总面和端面之间进行选择,避免了奇异性。利用李雅普诺夫稳定性理论证明了闭环系统的收敛性。数值仿真验证了所提控制律的有效性。
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引用次数: 0
A study on the performance of Lambda Control Chart for autocorrelated processes Lambda控制图在自相关过程中的性能研究
Suyi Li, Wenjia Wang
With the development of modern techniques of online data collection, more and more processes are observed to be autocorrelated. Applying traditional Shewhart control chart or even some advanced control charts like CUSUM and EWMA on autoregressive processes will be misleading. The most popular method dealing with autocorrelation is to firstly fit an ARMA model to the processes, and then apply control charts on the residuals. However, their performance is not satisfactory. In this paper, we study the Lambda Control Chart, and explore the characteristics and performance of this scheme.
随着现代在线数据采集技术的发展,越来越多的过程被观察到是自相关的。将传统的Shewhart控制图甚至CUSUM和EWMA等先进的控制图应用于自回归过程会产生误导。处理自相关最常用的方法是首先对过程拟合ARMA模型,然后对残差应用控制图。然而,他们的表现并不令人满意。本文研究了Lambda控制图,探讨了该方案的特点和性能。
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引用次数: 0
Memetic particle swarm optimization algorithm for DOA estimation under multipath environment 基于模因粒子群算法的多路径DOA估计
J. Hung
This paper introduces a new combine of Memetic particle swarm optimum (MPSO) and beam-space oblique projection operator method suitable for dealing with direction of arrival (DOA) under a multipath environment. Generally, oblique projection operator is applied to project measurements onto a low-rank subspace along a direction that is oblique to the subspace and it enhance signals while nulling interferences. However, the method will be biased under a multipath environment. Therefore, we have proposed the beam-space oblique projection operator by MPSO scheme for DOA under a multipath environment. The MPSO that incorporates local search techniques applies in the particle swarm optimization (PSO) and the procedure as follow: first, we used the PSO to estimate the signal DOA by oblique projection operator method. Second, the personal best position of the swarm to set up beam-space oblique projection operator and using gradient-based techniques to enhance exact. The MPSO uses beam-space rebuilding oblique projection operator for local search techniques to address the issue of reduce multipath effect and increase find exact DOA estimation. Finally, numerical example with different a multipath environment is presented to illustrate the design procedure and to confirm the performance of the proposed method.
本文提出了一种将模因粒子群优化算法与波束空间斜投影算子相结合的多径环境下的到达方向求解方法。一般采用斜投影算子将测量值沿与子空间倾斜的方向投影到低秩子空间上,在消除干扰的同时增强信号。然而,该方法在多路径环境下会产生偏差。因此,我们提出了基于MPSO的波束空间斜投影算子,用于多径环境下的DOA定位。将融合局部搜索技术的粒子群优化算法应用于粒子群优化算法中,具体步骤如下:首先,利用粒子群优化算法利用斜投影算子估计信号的DOA;其次,在群的个人最佳位置设置波束空间斜投影算子,并利用基于梯度的技术提高精度。该算法采用波束空间重建斜投影算子进行局部搜索,有效地降低了多径效应,提高了精确DOA估计。最后,通过不同多径环境下的数值算例说明了该方法的设计过程,并验证了该方法的性能。
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引用次数: 0
期刊
2016 2nd International Conference on Control Science and Systems Engineering (ICCSSE)
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