共查询到20条相似文献,搜索用时 49 毫秒
1.
本文首先介绍了目前室内定位的几种主流方法或技术,通过比较,着重对通过移动基站进行室内定位的技术研究进行展开,在此基础上,探讨了如何用移动基站实现室内定位的方法。 相似文献
2.
当前室内位置指纹定位系统主要用于对移动端的定位。借鉴其定位机理,研究了对无线电发射端的定位,属于平台侧位置指纹定位系统。从部署接收端的位置以减小定位误差的角度出发,提出了增大参考点之间欧式距离确定接收端位置的方案。同时,提出利用覆盖率的概念确定定位区间的接收端个数以满足区间定位的需求。建立了接收端位置及个数优化问题的数学模型,并用遗传算法和全覆盖原则对优化问题进行求解,给出了优化问题的实现流程。针对不同空间,对优化问题进行了仿真,比较了经验布置接收端和优化布置接收端的定位结果误差及接收端是否满足全覆盖的定位结果误差,验证了所提方法的合理性,对定位前部署接收端的个数和位置有一定的指导意义。 相似文献
3.
针对信息化车间运行遇到的巡检人员作业强度大和处理问题反应不及时两大问题,利用基于移动定位技术的多功能手环及手持终端,实现故障隐患信息毫秒级实时接收与实时远程处理;利用单元故障智能诊断技术、协同故障智能诊断技术和多指标分析评价风险预警技术,实现故障解决措施自生成、隐患预警与定制化推送。经试验验证,所设计的智能巡检系统室内定位误差较小,故障智能诊断结果和风险预警结果准确,满足实际生产需求。 相似文献
4.
5.
针对目前手机室内定位技术仍不够成熟的问题,本文在探讨手机定位技术现状和发展趋势的基础上,提出了一种新的室内定位方法,依靠智能手机内置磁感器进行室内地磁异常场测量,完成室内环境的定位,具有成本低、易于实现、定位精度高的优点,在手机室内定位上有较高的参考和研究价值。 相似文献
6.
在室内多径环境下信号视距传播易受障碍物影响,导致现有的一些室内定位技术对室内环境分布的估计较为困难。时间反转镜(TRM)室内无线定位技术可以有效地减少室内多径效应对信号的影响以及复杂环境造成的延时。但是,若没有信号传输信道的信息,常规TRM技术的定位精度就会大打折扣。针对该问题,给出了一种基于快速行进算法(FMM)的TRM室内无线定位方法。该方法首先利用FMM和同时代数重建算法(SART)迭代更新计算室内环境分布,然后使用估计结果进行TRM定位。仿真结果显示,对于小型规模的目标物体定位误差约为1.84 cm,在未知室内信道信息的仿真环境下,该方法比常规TRM技术的定位精度提高约32.90倍。 相似文献
7.
8.
针对视觉惯性里程计(Visual-Inertial Odometry,VIO)在特征高度重复的场合易产生较大误差以及Wi-Fi指纹精确度不高等问题,提出了一种基于VIO和Wi-Fi指纹技术的室内定位方法。该系统运用VIO和Wi-Fi指纹在系统层面的结合,利用Wi-Fi指纹的无漂移、成本低的特点和VIO在一定范围内的高精确度,先进行Wi-Fi指纹粗定位,后进行VIO精定位,将大面积切割成小面积从而有效提高系统室内定位精确度,降低误差。该系统能在精定位的同时进行对指纹数据库的更新。实验结果表明,该系统的定位误差小于单独使用VIO或Wi-Fi指纹的系统,平均误差达0.15 m,能够有效提高定位精度。 相似文献
9.
介绍了具有移动台定位功能的WCDMA网络结构,分析了网络中采用的3种基本定位技术的特点及实施方法,对定位技术中可供研究的课题进行了探讨,提出了主要研究方向。 相似文献
10.
11.
Holding percent of train media resources across China based on "Time Cube" on the Intermedia Recommendation Introduction Meeting on December HTC announced its high-profile strategy of tour marketing tapping the immeasurable potentials on the train. Meanwhile HTC officially launched its brand new product Olympic Train on the meeting providing a fabulous platform for all the brands that are prepared to do a smart marketing on the occasion of Olympic Games.…… 《中国对外贸易(英文版)》2008,(1):58
Holding 88 percent of train media resources across China, based on "Time Cube", on the 2008 Intermedia Recommendation and Introduction Meeting on December 19, 2007, HTC announced its high-profile strategy of tour marketing and tapping the immeasurable potentials on the train. Meanwhile, HTC officially launched its brand new product Olympic Train on the meeting, providing a fabulous platform for all the brands that are prepared to do a smart marketing on the occasion of 2008 Olympic Games. 相似文献
12.
Audrey Guo 《中国对外贸易(英文版)》2008,(1)
In the end of 2007, Air China Limited (hereinafter "Air China") and Shanghai Airlines, formally joined Star Alliance at a ceremony held in the new Terminal Three at Beijing Capital International Airport. With the addition of the two Chinese airlines, Star Alliance now has 19 member carriers operating 17,000 daily flights to 897 destinations in 160 countries. 相似文献
13.
Bai Yifeng 《中国对外贸易(英文版)》2008,(1):59-59
Under the guidance of the theme slogan of the 29th Olympic Games - One World One Dream, with dream, love and dedication as its theme, the 2008 Music Grand Ceremony & 1000 People Charity Concert on 100 days cotmtdown to Paralympic Gamesis officiaily launched on December 22, 2007. The 2008 Music Grand Ceremony is sponsored by China Disabled Persons' Federation, and co-hosted by National Paralympic Committee of China, 相似文献
14.
《中国对外贸易(英文版)》2008,(6):45-45
With its headquarters in the historic city of Yangzhou,Jiangsu Muyang Group Co.,Ltd has since its founding in 1967 grown into a well-known group corporation whose activities cover research & development,project design,manufacturing,installation and services in a multitude of industries including feed machinery and engineering,storage engineering,grain machinery and engineering,environmental protection,conveying equipment and automatic control systems. 相似文献
15.
Chun Yi 《中国对外贸易(英文版)》2008,(1):13
Aseries of events that occurred in October 2007, are rewriting the history of China's energy industry: November 3 an Energy Law Committee asked the public for suggestions on improvements; forty top experts came together to form the National Energy Expert Advisory Committee on November 6; and the National Oil Reserve Center (NORC)became the nerve centre of oil reserves on November 18. Yet, behind the progress of these recent activities remains the fact that international oil prices still hover around a very high price of US$ 90/barrel, and China's oil imports are close to accounting for half of its total oil reserves. 相似文献
16.
China Harbor Ten People elected the entrepreneurs who contributed a lot to port economy enterprises this year trough their talent management.These ten people embody their social responsibility professional skills creative ability and charming personality.Bearing full confidence in China's port economy the port entrepreneurs are brave enough to explore a brand new area so as to promote harbor economic development.…… 《中国对外贸易(英文版)》2008,(6):46-46
2007 China Harbor Ten People elected the entrepreneurs who contributed a lot to port economy and enterprises this year trough their talent management.These ten people embody their social responsibility,professional skills,creative ability,and charming personality.Bearing full confidence in China's port economy,the port entrepreneurs are brave enough to explore a brand new area,so as to promote harbor economic development. At the very beginning of 2008,China Shipping Website,Dalian Maritime University,and China Port and Shipping In- stitute jointly select the 2007 China Harbor Ten People,demonstrate port entrepreneurs' stunning minds,disclose their secrets to success,and providing abundant experiences to others in harbor development.The top ten people are various excellence during the ups and downs harbor development. 相似文献
17.
Guo Yan 《中国对外贸易(英文版)》2008,(10):22-23
Since the normalization of the diplomatic ties between China and ) Japan, the bilateral economic relations have deepened continually. According to the statistic of Japan, China passed U.S. to become Japan's top trade partner as well as is the second largest export market for Japan and is the largest import resource for Japan. Japan companies such as Mitsui, Sumitomo, Sony and Panasonic, have set the subsidiaries in China and explored their scales. This year 2008 marks the 30th anniversary of the signing of the ChinaJapan Treaty of Peace and Friendship. 相似文献
18.
《中国对外贸易(英文版)》2008,(12)
China's textile and apparel industry suffered an unprecedented cold market for exports in the first quarter this year,the result of a few factors including: the appreciating RMB, decreasing export rebate rate,expanding influence of the U.S. subprime crisis, increasing costs of production and rising labor cost. 相似文献
19.
Li Zhen 《中国对外贸易(英文版)》2008,(12):64-65
The May 12 earthquake in Sichuan caught Chinese people by surprise and took the nation's heart. While mourning the dead and searching for the missing, many services must be provided for the survivors in the wake of the earthquake. Available post-quake financial services have become an important part of the reconstruction effort in the disasterstricken areas of Sichuan province. 相似文献
20.
Robert A. Miller 《Journal of Business Ethics》2002,36(1-2):105-110
Aristotle saw ethics as a habit that is modeled and developed though practice. Shelly's Victor Frankenstein, though well intentioned in his goals, failed to model ethical behavior for his creation, abandoning it to its own recourse. Today we live in an era of unfettered mergers and acquisitions where once separate and independent media increasingly are concentrated under the control and leadership of the fictitious but legal personhood of a few conglomerated corporations. This paper will explore the impact of mega-media mergers on ethical modeling in journalism. It will diagram the behavioral context underlying the development of ethical habits, discuss leadership theory as it applies to management, and address the question of whether the creation of mega-media conglomerates will result in responsible corporate citizens or monsters who turn on their creators. 相似文献