位置服务系统研究及终端软件实现

【作者】 赵俊；

【导师】 周明天；

【作者基本信息】 电子科技大学 ， 计算机软件与理论， 2004， 硕士

【摘要】 可移动性是移动计算环境的本质特点之一，移动导致位置变化，而位置变化既对移动计算提出了挑战，又带来了新的应用。随着无线定位技术、无线通讯网络、地理信息系统、移动互联技术等发展，基于位置服务(Location-Based Services，LBS)的应用也得到快速发展。LBS是以位置服务为核心，通过通信网络获取移动终端用户的位置信息(经纬度坐标)，在地理信息系统的支持下，为用户提供包括信息追踪、导航、移动黄页等多种位置服务的一种新型业务。随着移动电话成为我们的生活中不可或缺的一部分，移动服务市场对利用移动电话实现位置信息的需求越来越迫切。本文主要讨论位置服务系统的关键技术，并在移动终端上开发了一个使用户能充分利用位置信息进行交流的位置服务系统终端软件。 本文首先介绍了移动计算关于位置的研究，然后讨论了LBS系统的特点与典型结构以及LBS的关键技术，包括移动定位技术、移动互联网访问技术、地理信息管理技术、数据表达和交互技术、嵌入式软件技术以及分布式系统交互技术等；随后介绍了一个移动位置服务系统的开发与实现，以如何实现定位为线索，首先介绍了系统的结构，根据需求分析提出了两种定位模式，然后详细介绍了基于BREW平台下两种定位模式的实现流程，提出一种效率较高的定位请求算法，并重点介绍了定位设计、通讯协议及事件机制与窗口设计。更多还原

【Abstract】 Mobiltility is one of the essential characteristics of mobile computing environment which leads to location change. The location changer is not only challenged the mobile computing, but also brings new applications into this field. With the development of wireless position technology, communication network, geographical information system and mobile internet technology, the applications of location based services (LBS) are booming. LBS is a new type of business service which provides position service including information tracking, navigating, and moving Yellow Page by obtaining the position information(the longitude and latitude coordinate) of the mobile end client through the communication network and by the supporting of geographical information system. In this thesis, the research and implementation of a mobile location service system for the cellular telephone users was described.Firstly, the research on mobile computing related to location services is introduced. Then the features, typical architecture and the pivotal technologies of LBS are discussed. In the following, the development and implementation of a mobile location service system are depicted in detail. Following the clue of realization of position, the architecture of the mobile location system were discussed at first. Two position models are put forward according to the requirement analysis, and the realization procedure of the two position models is described. An efficient algorithm of position request is developed in designing with specially emphasis on design of position and communication protocols.更多还原