【摘要】 空间信息移动服务是GIS领域重要的发展方向和研究热点,然而无线互联网络的低带宽、非对称、不稳定等特性已经成为制约其发展的"瓶颈"问题。运用新的思路与方法,在对网格计算和MobileAgent(MA)分布式计算理论与方法研究的基础上,提出一种基于MA的空间信息移动服务网格分布计算模型。该模型集成网格计算、MA,GPS,CDMA,TCP/IP,UDP等理论与关键技术,从底层实现空间信息移动服务网格模型原型平台,包括空间信息MA,MA代理服务器、分布式网格GIS服务器和移动GIS客户端等模块,可以进行空间信息的分布式组织与索引、网格计算和移动服务、移动目标的实时监控与调度等应用。利用该模型在上海市空间信息移动服务网格应用中进行试验,结果表明所提出的模型在无线互联网络环境下具有较好的适应性和灵活性。更多还原

【Abstract】 A new methodology of mobile spatial information service is studied based on grid computing environment.Key technologies are presented in the methodology,including grid computing,Mobile Agent(MA)distributed computing,Global Positioning System(GPS),Code Division Multiple Access(CDMA),Transfer Control Protocol/Internet Protocol(TCP/IP),and User Datagram Protocol(UDP).In view of the narrow bandwidth and instability of the wireless internet,limited processing speed and low memory of mobile devices,a new mobile agent based mobile spatial information service grid model is further proposed that has good load balance,high processing efficiency,less network communication and thus suitable for mobile spatial information service.It can provide applications of spatial information grid computing and mobile service,real-time monitoring and scheduling of mobile objects.The theories and technologies architecture of mobile spatial information service grid are built originally from the base,including spatial information mobile agent model,distributed grid Geographic Information System(GIS)server model,mobile agent server model and mobile GIS client model.An application system for mobile spatial information service grid is therefore developed by authors using visual C++ and embedded visual C++.A field test is carried out through this system in Shanghai,and the results show that the proposed model and methods are feasible and adaptable for mobile spatial information service.更多还原