地理空间传感网融合服务技术与应用

随着遥感数据网、传感网、物联网和人工智能的发展,逐渐形成空天地海立体化、集成化和一体化的地理空间传感网。地理空间传感网感知资源呈现出多源、异构和分散的特征,面向多层次用户个性化、即时化和智能化应用需求,存在异构资源共享管理、多协议实时接入、时空无缝感知、自动化感知和精准预测等技术挑战。静态地理信息服务由于无法提供鲜活的地理信息,难以满足地理事件的综合监测、决策预警和聚焦应用需求,急需发展地理空间传感网融合服务技术和实时动态地理信息服务平台。本文围绕信息物理网环境下空天地海观测平台的观测高效共享和融合服务问题,提出了传感网观测共享信息模型和点面观测协同无缝重建模型,突破了观测在线接入、集成管理、星地融合、时空预测和聚焦服务等地理空间传感网融合服务关键技术,研制了包含"感-联-知-控"等功能的传感网时空信息网络感知服务系统GeoSensor,介绍了GeoSensor在流域、海洋和城市等典型应用。未来将进一步发展"人-水-城"智能感知认知理论,突破"空天地海人"群智感知、空间智能和认知服务技术,开展长江经济带应用。

地理空间传感网信息公共服务平台的设计与实现

随着对地观测技术的发展,传感器类型与数量不断增加,为了高效管理传感网中相关的信息与服务资源,便于用户按需、全面和准确地获取并应用这些资源,基于传感网信息模型和服务接口规范,设计并实现了地理空间传感网信息公共服务平台GeoSensor。该平台通过调用和组合传感器注册服务、传感器观测服务、实时制图服务和卫星位置服务等多种服务,实时获取传感器、观测数据和数据产品等信息资源,并在天地图上以图形、文字、表格和视频等方式形象生动地展示这些信息资源。GeoSensor系统实现了对遥感、移动和原位等类型的对地观测传感器及其观测数据等资源的在线搜索、即时获取、网络控制和实时制图,可满足应急处理时对传感器检索、观测数据获取、传感器控制和数据产品生成等功能的需求。

基于地理本体的空间传感网数据处理

传感网的研究和应用已经成为推动新信息时代发展的重要动力,而传感网络的运行无法避免结构复杂的海量传感数据的处理.尽管目前已有大量的数据融合算法和模型的出现,但无法避免数据语义、网络语义异构等等问题.结合传感网的特征和地理本体的研究,本文首先提出了空间传感网的定义,随后提出了基于空间传感网的地理本体库公理化模型,最后给出了应用于湖泊领域的实践,结果显示采用文中所提方法既能够节约传感网有限的动力资源,又能够有效消除传感网中的异构.

空间无线传感网体系架构及业务实现探讨

对地观测系统已经从单一平台发展成为多星组网、多平台、多传感器的系统。携带传感器的卫星使用星间链路组成了一个空间无线Ad Hoc网络,实现科学数据采集,并把传感器采集的数据传输下载到地面站,这样就形成了一个空间无线传感网系统。文章介绍了空间无线传感网的传感层、通信层、信息层三层体系架构,传感网SWE(Sensor Web Enablement)模型,探讨了信息层业务实现技术流程,阐述了基于SOAP协议架构的信息层业务实现方法,提出了基于Restful Web协议架构的信息层业务实现优化方案,并比较了信息层两种不同方案实现原理和性能,此外提出了通信层网络传输移动管理改进建议。

Space-Time Correlation Based Fast Regional Spectrum Sensing in Cognitive Radio

In this paper,a space-time correlation based fast regional spectrum sensing(RSS)scheme is proposed to reduce the time and energy consumption of traditional spatial spectrum sensing. The target region is divided into small meshes,and all meshes are clustered into highly related groups using the spatial correlation among them. In each group,some representative meshes are selected as detecting meshes(DMs)using a multi-center mesh(MCM)clustering algorithm,while other meshes(EMs)are estimated according to their correlations with DMs and the Markov modeled dependence on history by MAP principle. Thus,detecting fewer meshes saves the sensing consumption. Since two independent estimation processes may provide contradictory results,minimum entropy principle is adopted to merge the results. Tested with data acquired by radio environment mapping measurement conducted in the downtown Beijing,our scheme is capable to reduce the consumption of traditional sensing method with acceptable sensing performance.

A new measure for evaluating spatially related properties of traffic information credibility

With the wide applications of sensor network technology in traffic information acquisition systems,a new measure will be quite necessary to evaluate spatially related properties of traffic information credibility.The heterogeneity of spatial distribution of information credibility from sensor networks is analyzed and a new measure,information credibility function(ICF),is proposed to describe this heterogeneity.Three possible functional forms of sensor ICF and their corresponding expressions are presented.Then,two feasible operations of spatial superposition of sensor ICFs are discussed.Finally,a numerical example is introduced to show the calibration method of sensor ICF and obtain the spatially related properties of expressway in Beijing.The results show that the sensor ICF of expressway in Beijing possesses a negative exponent property.The traffic information is more abundant at or near the locations of sensor,while with the distance away from the sensor increasing,the traffic information credibility will be declined by an exponential trend.The new measure provides theoretical bases for the optimal locations of traffic sensor networks and the mechanism research of spatial distribution of traffic information credibility.