基于激光投射的室内视觉导航地图创建方法

针对基于图像分割的室内视觉导航地图创建方法存在无法准确获取导航地图等问题,提出一种利用激光投射的创建方法。在室内天花板上安装激光发射装置,通过激光光斑在图像中实际位置与预测位置的差计算投射区域的高度,利用获得的高度信息创建导航地图。搭建了验证导航地图创建算法的实验平台,实验结果表明,本文方法能够获得地面高度分布,可以创建准确的室内导航地图。     

一种基于VSLAM的室内导航地图制备方法

针对室内复杂环境下导航地图制备问题,提出一种采用图像传感器进行导航地图制备的方法。首先,基于VSLAM技术估计相机位姿,经后端优化后生成环境三维点云;其次,筛选出地面点云,基于随机采样一致性算法得到精确的地面平面方程;最后,投影机器人通行环境区域的点云至二维栅格地图,通过利用贝叶斯方法更新栅格占用状态后,实现室内导航地图的制备。实验结果表明,基于VSLAM制备的室内导航地图精度满足导航要求,且不同于传统激光地图构建方法,地图中包含环境的三维结构信息,在进行路径规划实验中,避免了规划的路径穿过低矮物体及悬空物体的错误。     

基于ROS的激光SLAM室内建图定位导航智能机器人设计

文章基于Linux系统上的ROS平台实现基本的SLAM算法,机器人可以实现构建室内地图、室内自动避障导航及室内定位等功能。底层主要以STM32和树莓派为核心,通过陀螺仪和码盘电机得到机器人方位和行走里程,使用激光雷达获取室内地图信息。在ROS上执行相应脚本,调用Gmapping,ACML算法实现室内地图构建和定位。     

一种融合深度相机与激光雷达的室内移动机器人建图与导航方法

为解决室内移动机器人导航过程中容易碰撞障碍物的问题,本文提出一种融合深度相机和激光雷达的室内移动机器人建图与导航方法,在机器人底盘上安装激光雷达、深度相机和里程计,利用Gmapping算法进行室内二维地图构建,同时用ROS中depthimage_to_laserscan功能包对深度图像进行二维投影,生成的二维栅格地图与激光雷达所建的地图进行融合.实验证明该方法使建立的地图更加完善,提高了室内移动机器人检测周围障碍物的能力和自主导航的能力.     

基于ROS的无人派件精灵系统设计

该文主要是对物流配送机器人在校园、社区、室内等环境下的物流配送的"路径规划-包裹配送-运动控制-环境建模-位置定位"展开研究。采用了ROS(Robot Operating System)机器人操作系统作为整个物流配送机器人的核心,通过ROS开源操作系统的功能包结合外围传感器来结合PID算法的差速运动模型来实现对机器人的任意角度运动控制以及远程控制,通过外围传感器进行对周边的环境信息进行感知结合SLAM算法进行二维地图的构建。通过在构建好的地图上进行设计一个起始点和一个目标点,物流配送机器人在该地图中进行路径规划,在规划好的路线执行导航到目标点,在导航的途中遇到障碍物,机器人会自动的避开障碍物或者从新规划路线,从而来实现包裹从起始点到目标点的配送工作。     

基于虚拟现实的移动机器人真实环境三维建模系统

传统的虚拟现实（VR）技术通过人为建模的方式生成室内三维地图模型，存在速度慢、模型与现实物体尺度之间存在偏差的问题。鉴于此，提出基于VR的移动机器人的真实环境三维建模系统。首先通过视觉同时定位与建图（SLAM）技术快速地获取室内的高精度稠密三维点云地图；其次将三维点云通过曲面重建算法重建为室内三维模型并导入到unity 3D中；然后借助VR设备将室内三维模型置于三维立体的虚拟环境中；最后通过视觉SLAM技术实现移动机器人在室内环境的重定位，实时映射机器人在模型中的位姿，完成交互。利用视觉SLAM技术构建三维地图模型不仅快速，解决了场景尺度偏差的问题，且实现地图的重复使用。同时VR技术也使操作人员可以获得强烈的沉浸感，从而更好地理解机器人的工作环境。     

室内激光雷达导航系统设计

小型无人机和移动机器人技术迅速发展,对室内导航技术的要求越来越高,针对当前室内导航精度不高、导航设备比较复杂的问题,提出一种采用激光雷达定位和地磁传感器检测相结合的室内主动导航方法。该方法首先使用激光雷达扫描室内环境,用采集到的数据拟合出室内地图,根据目的地信息和室内的环境信息来规划行进的路线;然后在行进中使用激光雷达连续地扫描得到数据与地图数据进行比较,来确定所处的位置,同时使用地磁传感器取得行驶的方向,二者相结合判断是否在规划的路线上行驶,及时地对出现的偏差进行纠正;最后通过搜索RFID地标确定是否已经到达指定位置。仿真和实验的结果表明:所设计的室内激光雷达导航系统结构简单、可靠性高,能够较好地满足室内导航的要求。     

基于深度相机的机器人室内定位技术研究

机器人在室内运动时,需要创建环境地图并估计位姿,以实现自主定位和导航。针对机器人的同时定位与地图创建(SLAM)问题,采用动态贝叶斯网络描述SLAM状态转移过程。通过不断迭代更新机器人的位置估计和修正估计值,完成机器人的室内定位。基于深度相机采集的RGB图像信息,进行相邻帧图像的特征提取与匹配,估算机器人当前位姿。然后使用迭代最近点算法优化初始位姿。以初始位姿为节点,相邻帧的约束关系为边创建节点图。进一步采用Hogman算法对整个节点图进行动态优化,得到全局一致的室内地图。最后根据优化后的节点图,多帧数据叠加就可得到三维地图。实验采用华硕Xtion Pro Live深度相机,实验室地点为目标,成功创建了环境的三维地图,验证了方法的有效性和可行性。     

移动机器人的同时定位与地图创建的算法研究

移动机器人的同时定位与地图创建是当前机器人领域研究的基本问题与热点,也是实现智能机器人实现自主导航和控制决策的关键。本文从基于贝叶斯滤波器模型和基于图优化平滑模型两个方面对移动机器人同时定位与地图创建(SLAM)的研究进行了综述,介绍了这两种模型的基本框架以及关键技术,阐述了模型的各种不同实现形式,分析了这些算法的性能,并探讨了这些算法的优缺点以及相关难点的解决思路。最后对基于滤波器模型和基于平滑模型的同时定位与地图创建的未来发展进行展望。     

基于5G通信系统的室内定位及导航解决方案

随着无线定位技术的飞速发展,人们对室内定位需求的上升,室内定位技术成为近年来的研究热点。本方案以密集部署的5G mMTC(海量机器类通信)物联网终端为定位辅助信标,实现目标的三维精准定位,水平面和垂直面的定位精度均可小于1 m。本方案还可将增强的精准定位输出(即三维地理坐标)与高精度室内地图集成起来,从而可以提升定位输出的实用性和可靠性,达成按图索骥的室内精确导航。     

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.     

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.     

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.     

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.     

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     

JOURNAL OF ELECTRONICS(CHINA)

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NEXT GENERATION WIRELESS NETWORKS–ESPECIALLY THE USE OF MILLI-MICROWAVE BANDS

The global bandwidth shortage of wireless communications has motivated the exploration of the naillimeter wave （ram-wave） frequency spectrum for the next generation wireless communications. Recent advances in RF CMOS technology and high speed baseband signal processing technologies have enabled tile extensive research and development of turn-wave wireless communications. The multi gigabit per second data rate of ram-wave system will lead to applications in many important scenarios, such as WPAN, WLAN,back-haul for cellular system. And the frequency bands include 28 GHz, 38 GHz, 45GHz, 60GHz, E-BAND and even beyond 100 GHz. The propagation and the imitation of the RF circuits design in these frequency bands make the directional antennas be inevitable for mm-wave communications.