一、数据融合技术1.数据融合技术。随着LBS（Location Based Service）系统获取数据源种类的不断增多,多源数据间的关联程度也日趋紧密,如何高效地处理数据的兼容问题就显得越发困难。另外,由于缺乏相关行业规范,设备厂家制定信息格式...一、数据融合技术1.数据融合技术。随着LBS（Location Based Service）系统获取数据源种类的不断增多,多源数据间的关联程度也日趋紧密,如何高效地处理数据的兼容问题就显得越发困难。另外,由于缺乏相关行业规范,设备厂家制定信息格式的自由度较大,造成了信息表现形式的多样化。基于这些原因,数据融合技术应运而生。2.数据融合技术的应用。展开更多
公元2003年,一个外地客商来到一座陌生的城市,这是他第一次来到这座城市,对该城市一无所知,他现在想找一家合适的酒店住下来。于是他从随身携带的旅行包里取出一张该城市的EMD(Eureka Mobile Data)数据卡,插入随身携带的带有GPS接收机...公元2003年,一个外地客商来到一座陌生的城市,这是他第一次来到这座城市,对该城市一无所知,他现在想找一家合适的酒店住下来。于是他从随身携带的旅行包里取出一张该城市的EMD(Eureka Mobile Data)数据卡,插入随身携带的带有GPS接收机的掌上电脑,运行了正太数码科技有限公司的移动位置服务应用系统(Eureka View)。展开更多
基于位置服务业务的兴起及迅猛发展趋势,研究并设计实现了基于Internet的位置服务平台中的地理信息系统GIS(Geographic Information System)。系统是以MapXtreme for Java为核心、按照瘦客户机的四层体系架构开发实现的,重点设计并开发...基于位置服务业务的兴起及迅猛发展趋势,研究并设计实现了基于Internet的位置服务平台中的地理信息系统GIS(Geographic Information System)。系统是以MapXtreme for Java为核心、按照瘦客户机的四层体系架构开发实现的,重点设计并开发了地图显示、终端定位、地图控制、相关查询、地理编码、逆地理编码等功能模块,并通过组件封装将GIS子系统顺利移植到了LBS(Location Based Service)平台中。整个系统100%纯Java实现,具有良好的可移植性。展开更多
This paper introduces the significance of indoor positioning and analyzes the related problems. The latest research on indoor positioning is introduced. Further, the positioning accuracy and the cost of typical local ...This paper introduces the significance of indoor positioning and analyzes the related problems. The latest research on indoor positioning is introduced. Further, the positioning accuracy and the cost of typical local and wide area indoor positioning systems are compared. The results of the comparison show that Time & Code Division-Orthogonal Frequency Division Multiplexing (TC-OFDM) is a system that can achieve real-time meter-accuracy of indoor positioning in a wide area. Finally, in this paper, we indicate that the seamless high-accuracy indoor positioning in a wide area is the development trend of indoor positioning. The seamless Location Based Services (LBS) architecture based on a heterogeneous network, key technologies in indoor positioning for decimeter-accuracy and seamless outdoor and indoor Geographic Information System (GIS) are elaborated as the most important research fields of future indoor positioning.展开更多
The rapid development of location-based service(LBS) drives one special kind of LBS, in which the service provider verifies user location before providing services. In distributed location proof generating schemes, pr...The rapid development of location-based service(LBS) drives one special kind of LBS, in which the service provider verifies user location before providing services. In distributed location proof generating schemes, preventing users from colluding with each other to create fake location proofs and protecting user's location privacy at the same time, are the main technical challenges to bring this kind of LBS into practical. Existing solutions tackle these challenges with low collusion-detecting efficiency and defected collusion-detecting method. We proposed two novel location proof generating schemes, which inversely utilized a secure secret-sharing scheme and a pseudonym scheme to settle these shortcomings. Our proposed solution resists and detects user collusion attacks in a more efficient and correct way. Meanwhile, we achieve a higher level of location privacy than that of previous work. The correctness and efficiency of our proposed solution is testified by intensive security analysis, performance analysis, as well as experiments and simulation results.展开更多
With the rapid development of location-aware devices such as smart phones,Location-Based Services(LBSs) are becoming increasingly popular. Users can enjoy convenience by sending queries to LBS servers and obtaining se...With the rapid development of location-aware devices such as smart phones,Location-Based Services(LBSs) are becoming increasingly popular. Users can enjoy convenience by sending queries to LBS servers and obtaining service information that is nearby.However, these queries may leak the users' locations and interests to the un-trusted LBS servers, leading to serious privacy concerns. In this paper, we propose a Privacy-Preserving Pseudo-Location Updating System(3PLUS) to achieve k-anonymity for mobile users using LBSs. In 3PLUS, without relying on a third party, each user keeps pseudo-locations obtained from both the history locations and the encountered users, and randomly exchanges one of them with others when encounters occur. As a result, each user's buffer is disordered. A user can obtain any k locations from the buffer to achieve k-anonymity locally. The security analysis shows the security properties and our evaluation results indicate that the user's privacy is significantly improved.展开更多
文摘一、数据融合技术1.数据融合技术。随着LBS（Location Based Service）系统获取数据源种类的不断增多,多源数据间的关联程度也日趋紧密,如何高效地处理数据的兼容问题就显得越发困难。另外,由于缺乏相关行业规范,设备厂家制定信息格式的自由度较大,造成了信息表现形式的多样化。基于这些原因,数据融合技术应运而生。2.数据融合技术的应用。
文摘公元2003年,一个外地客商来到一座陌生的城市,这是他第一次来到这座城市,对该城市一无所知,他现在想找一家合适的酒店住下来。于是他从随身携带的旅行包里取出一张该城市的EMD(Eureka Mobile Data)数据卡,插入随身携带的带有GPS接收机的掌上电脑,运行了正太数码科技有限公司的移动位置服务应用系统(Eureka View)。
文摘基于位置服务业务的兴起及迅猛发展趋势,研究并设计实现了基于Internet的位置服务平台中的地理信息系统GIS(Geographic Information System)。系统是以MapXtreme for Java为核心、按照瘦客户机的四层体系架构开发实现的,重点设计并开发了地图显示、终端定位、地图控制、相关查询、地理编码、逆地理编码等功能模块,并通过组件封装将GIS子系统顺利移植到了LBS(Location Based Service)平台中。整个系统100%纯Java实现,具有良好的可移植性。
基金This work was supported by the National High Technology Research and Development Program (863 Program) of China under Grant No.2012AA120801the National High Technology Research and Development Program (863 Program) of China under Grant No.2012AA120802
文摘This paper introduces the significance of indoor positioning and analyzes the related problems. The latest research on indoor positioning is introduced. Further, the positioning accuracy and the cost of typical local and wide area indoor positioning systems are compared. The results of the comparison show that Time & Code Division-Orthogonal Frequency Division Multiplexing (TC-OFDM) is a system that can achieve real-time meter-accuracy of indoor positioning in a wide area. Finally, in this paper, we indicate that the seamless high-accuracy indoor positioning in a wide area is the development trend of indoor positioning. The seamless Location Based Services (LBS) architecture based on a heterogeneous network, key technologies in indoor positioning for decimeter-accuracy and seamless outdoor and indoor Geographic Information System (GIS) are elaborated as the most important research fields of future indoor positioning.
基金supported by the National Natural Science Foundation of China(Grant No.41371402)the National Basic Research Program of China("973"Program)(Grant No.2011CB302306)the Fundamental Research Funds for the Central University(Grant No.2015211020201 and No.211274230)
文摘The rapid development of location-based service(LBS) drives one special kind of LBS, in which the service provider verifies user location before providing services. In distributed location proof generating schemes, preventing users from colluding with each other to create fake location proofs and protecting user's location privacy at the same time, are the main technical challenges to bring this kind of LBS into practical. Existing solutions tackle these challenges with low collusion-detecting efficiency and defected collusion-detecting method. We proposed two novel location proof generating schemes, which inversely utilized a secure secret-sharing scheme and a pseudonym scheme to settle these shortcomings. Our proposed solution resists and detects user collusion attacks in a more efficient and correct way. Meanwhile, we achieve a higher level of location privacy than that of previous work. The correctness and efficiency of our proposed solution is testified by intensive security analysis, performance analysis, as well as experiments and simulation results.
基金supported by the National Natural Science Foundation of China under Grants No.61003300,No.61272457the Fundamental Research Funds for the Central Universities under Grant No.K5051201041the China 111 Project under Grant No.B08038
文摘With the rapid development of location-aware devices such as smart phones,Location-Based Services(LBSs) are becoming increasingly popular. Users can enjoy convenience by sending queries to LBS servers and obtaining service information that is nearby.However, these queries may leak the users' locations and interests to the un-trusted LBS servers, leading to serious privacy concerns. In this paper, we propose a Privacy-Preserving Pseudo-Location Updating System(3PLUS) to achieve k-anonymity for mobile users using LBSs. In 3PLUS, without relying on a third party, each user keeps pseudo-locations obtained from both the history locations and the encountered users, and randomly exchanges one of them with others when encounters occur. As a result, each user's buffer is disordered. A user can obtain any k locations from the buffer to achieve k-anonymity locally. The security analysis shows the security properties and our evaluation results indicate that the user's privacy is significantly improved.
