BP神经网络在车辆组合导航中的应用研究

针对车辆GPS/DR组合导航系统在GPS信号被遮挡时无法完成DR零点更新的问题,提出了基于BP神经网络的DR位置误差预测模型来解决该问题。在GPS有效时,该算法采用基于平稳小波变换的扩展卡尔曼滤波器对GPS/DR信号进行数据融合得到车辆实时的精确位置,与经平稳小波变换软阈值模平方去噪法处理的DR位置数据进行平稳小波多尺度比较获得DR位置误差;然后用BP神经网络建立DR位置误差预测模型,为了提高所用网络的泛化能力,采用了贝叶斯正则化规则训练网络。在GPS失效时,利用已建立的预测模型预测DR位置误差来修复DR位置数据,实现车辆行驶在复杂路径下的实时精确导航定位。仿真表明,该算法对车辆GPS/DR组合导航系统有效。     

车辆GPS远程监控系统开发

为了解决车辆信贷风险控制、车辆远程位置监控、远程故障诊断、车辆行驶区域设定等问题,研究和开发了GPS远程监控系统。采用＂远程控制中心＋GPS终端＂的模式构建,整车上的GPS终端通过CAN总线与发动机ECU进行通信,实现对发动机信息的采集以及响应控制中心的远程控制命令。目前该系统已成功应用于某型号的电控发动机,实现了位置监控、整车行驶路线设置、发动机油耗统计、发动机信息远程诊断、远程坡行控制等功能。     

动态背景下运动车辆的检测与跟踪研究

为实现对车载设备视频图像中车辆的识别和跟踪,针对图像中的运动目标和动态背景,提出了一种基于特征学习的目标检测和超像素跟踪算法.该算法首先对训练图像进行HOG特征提取,并利用AdaBoost算法得到强分类器.利用强分类器对采集的图像进行车辆检测,从而确定搜索区域.结合对搜索区域的超像素分割结果,采用均值漂移聚类算法实现车辆识别与跟踪.实验结果表明,该算法可以很好地实现视频序列中的车辆识别,提高了目标跟踪的实时性.     

基于改进高斯模型的车流量检测算法

提出了一种基于改进单高斯模型的车辆检测与流量统计算法,该算法采用改进的单高斯模型对移动目标进行检测,然后选用HSV颜色空间抑制阴影,提高了目标提取的准确率,最后,按车道分别设置相应的虚拟区域,以实现车流量的统计工作.为验证算法的有效性,在标准测试视频上进行了对比实验,实验结果表明,该算法能够快速地提取车辆目标,且具有较高的车辆识别率,有一定的实用价值.     

基于摄像机标定的车辆速度检测方法

分析了摄像机标定技术的原理以及常用摄像机标定方法,针对高速公路的实际情况以及应用需求,提出了基于平面单应性矩阵的摄像机标定算法,通过摄像机标定对检测区域进行网格划分,从而进行车辆速度的检测。经实验测试,该方法易于实现,且具有较高的检测精度,平均测速准确率达90%以上。     

基于北斗RDSS的GPS区域差分技术

本文提出了一种基于北斗RDSS的GPS区域差分技术的实现方案,该方案克服了差分GPS技术受到参考站和用户站之间距离的限制。本系统中基准型GPS接收机伪距修正数的计算、用户接收机导航解算所需的卫星星历数据、时间数据、伪距信息和伪距修正数的提取以及差分算法实现和接收机定位算法全部在DSP＋FPGA中实现。通过试验数据分析比较可见,采用基于北斗RDSS的GPS区域差分技术,对GPS导航定位精度有明显提高,该技术为未来实现高精度GPS导航定位有一定的参考价值。     

计及分布式能源配电网多时间尺度优化控制

针对配电网中分布式能源控制方式存在网配效率低、控制能力差的问题,采用混沌差分进化算法实现全局优化与区域协调控制,并将配电网全网划分成多时间尺度区域,通过种群粒子实现控制区域模拟,进而实现划分后小区域中不同时间尺度的控制,并根据吞吐量实现能源负荷的可控控制,试验时,通过搭接仿真平台,构建配电网拓扑结构,对配电网设备参数以及节点的功率值进行设置,验证了该研究方法的可行性,提高了配电网运行的稳定性。     

基于GPS/BD-2的军队车辆监控系统设计

针对军队中如何对军车进行有效监控和调度,提高战时物资投递效率的问题,提出了一种基于GPS/BD-2的军队车辆监控系统的设计。该系统采用信息化手段,依托北斗二代和GPS组合定位系统,设计了GPS/BD-2车载终端、信息处理服务器和指挥调度终端三部分,实现了车辆身份与入网管理、车辆管理、车辆监控、报警管理、统计查询、系统管理等业务需求。本系统提供更加精准的定位服务,满足了信息化条件下军队车辆保障的需求,促进部队车辆建设安全、科学发展。     

车辆导航定位仿真试验系统研究

研究车辆导航定位仿真算法及实现方法,为车辆虚拟驾驶等离线试验研究提供定位数据具有重要的现实意义.通过GPS卫星星座的运动仿真、最佳定位星座的选取和仿真接收机的设计,将车辆运动仿真得到的车辆位置信息转换为GPS信号输入到虚拟驾驶模块,实现GPS车辆导航定位仿真实验.该系统所输出的虚拟定位数据能够满足离线试验对数据的要求.     

基于局部优化遗传算法求解车辆路径问题

在车辆路径问题中,为了解决遗传算法搜索效率普遍不高的难题,避免种群出现早熟现象,提出一种基于局部优化的遗传算法。该算法首先针对每条车辆路径进行优化,然后采用动态线性标定方式设计适应度函数,并改善选择策略,交叉算子,变异算子等操作,从而构造搜索效率显著提高的局部优化遗传算法。应用该算法进行大量的实验,结果表明,此算法简单且有效。     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks     

Call for Papers—Feature Topic,Vol.12,No.7,2015

正Information Centric Networking Information-Centric Networking(ICN) is an emerging direction in Future Internet architecture research,gaining significant tractions among academia and industry.Aiming to replace the conventional host-to-host communication model by a data-centric model,ICN treats data content as the first