| 基于无线局域网IEEE802.11技术的地理空间定位方法 |
| |
| 引用本文： | 孙如江,闾国年,叶春,焦杰.基于无线局域网IEEE802.11技术的地理空间定位方法[J].地球信息科学,2004,6(3):62-67. |
| |
| 作者姓名： | 孙如江 闾国年 叶春 焦杰 |
| |
| 作者单位： | 南京师范大学地理信息科学江苏省重点实验室,南京,210097;中国人民解放军94748部队,南京,210018;南京师范大学地理信息科学江苏省重点实验室,南京,210097;中国人民解放军94748部队,南京,210018 |
| |
| 基金项目： | 国家863课题“3S”行业示范应用技术研究-企业应用(2002AA134077)
南京师范大学“211工程”二期重点学科研究成果． |
| |
| 摘 要： | 分析对比了多种地理空间定位方法,归纳了各种不同尺度下定位的特点,以及定位方法的实现过程,从IEEE802.11无线局域网技术的MAC协议出发,提出了基于无线局域网IEEE802.11技术的地理空间定位方法,实现的技术流程,并分析了其发展趋势。利用MAC的帧头和帧体都可以实现定位功能,利用MAC帧头的定位可以适用于计算能力较强的移动台上,而利用帧体的定位,由于只需解析内容不需要查询计算,所以能够用于手机等移动对象。使用无线局域网可以实现定位平台,同时又能实现无线接入的通信功能,所以大大降低了总的建设成本,因此具有很大的现实意义。
|
| 关 键 词： | 地理空间定位技术 GPS 接近式定位 无线局域网 信标机 地理信息系统 |
| 收稿时间： | 2004-03-09; |
| 修稿时间： | 3/9/2004 12:00:00 AM |
Study on the Geographical Positioning Method Based on IEEE802.11 Wireless LANs |
| |
| SUN Rujiang.Study on the Geographical Positioning Method Based on IEEE802.11 Wireless LANs[J].Geo-information Science,2004,6(3):62-67. |
| |
| Authors: | SUN Rujiang |
| |
| Institution: | 1. Jiangsu Provincial Key Gab of Geographical Information Science, Nanjing Normal University, Nanjing 210097, China;
2. PLA 94748 Unit, Nanjing 210018, China |
| |
| Abstract: | The paper analyses several geographical positioning methods,and sum up characters of the methodsin different scales and procedures.From IEEE802.11 Wireless LANs protocol,a new geographical positioningmethod and its procedure is presented,and the tendency of the geographical positioning method with WirelessLANs protocol in the future is discussed in the paper.Its principle is like a lighthouse which at the seasidesends signals for navigating ships to share.Precision of positioning depends on the clarity of observation.Whena AP(Access Point)in broadcast mode sends a frame that includes local MAC address,MS(Mobile Station)canreceive the signal.By the MAC address it gets its place name,geographical code,longitude and latitude,whichinclude local information.It can be positioned not only by the head of MAC frame but also by the body of MACframe.The former needs calculating of inquire,and the latter does not,so it may be suitable for this kind of mo-bile station,which likes mobile phone.The smaller the range to be receivable for the wireless signal,the higherthe positioning precision.A broadcast frame is so short,for instance,shorter than a microsecond that the AP hasfunctions of communication and positioning.Using the IEEE802.11 MAC frame to position,this method protectsthe safety of national geographical information,because it sends relative position coordinate,and hides the abso-lute position coordinate.The function of positioning can be added to Wireless LAN in existence,thus its con-struction cost is cut down greatly. |
| |
| Keywords: | technology of geographical positioning GPS wireless LANs lighthouse GIS |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
| 点击此处可从《地球信息科学》浏览原始摘要信息 |
| 点击此处可从《地球信息科学》下载免费的PDF全文 |
|
