摘要
为降低现有定位方法对基础设施和电子地图的依赖程度,该文结合环境中的二维码信息与智能手机传感器采集的数据,提出了一种基于行人航迹推算(PDR)技术和地理网格的室内外一体化定位方法。该方法由网格编码提供室内外一体的位置信息,消除PDR定位过程中的累积误差,并通过便捷的编码运算实现位置的高效求解,最终以网格单元展示行人位置与行走轨迹。按照全球规则划分、多层级嵌套及编码可计算的地理网格选取原则,以GeoSOT为例开展实验,定位误差始终控制在行走距离的5%以内,证明了算法的可行性与有效性。该方法可用于通讯链路受阻或地图难以获得等特殊场景的辅助定位,对于室内外一体化定位技术的发展具有实用价值。
In order to reduce current positioning methods′dependence on infrastructures and electronic maps,this paper proposes a novel indoor-outdoor integrated positioning method whose implementation uses QR codes and smartphone sensor data.This method is based on Pedestrian Dead Reckoning(PDR)technology and geographic grid,meaning that its design refers to PDR algorithm and its positioning reference chooses geographic grid.PDR and geographic grid have complementary advantages on position acquisition,calculation and presentation.To be specific,firstly the method obtains indoor-outdoor integrated positions in the format of geographic grid codes and eliminates accumulated errors of PDR.Secondly,based on the estimations of step counts,step sizes and step directions,positions can be figured out efficiently through simple code calculation.Finally,positions and routes of the pedestrian are showed by grid cells.According to geographic grid selection principles which consist of global subdivision,multi-level nesting and computable codes,GeoSOT is selected and used in experiments.Experiments show that positioning errors are controlled within 5% of walking distance all the time.The feasibility and effectiveness of the algorithm are demonstrated to a certain extent.Hence,this method can be used as an assisted positioning approach in some special situations where positioning devices fail to get signals or maps are hard to obtain.Additionally,the method has high practical value for the development of indoor-outdoor integrated positioning technology.
出处
《地理与地理信息科学》
CSCD
北大核心
2016年第6期32-36,共5页
Geography and Geo-Information Science
基金
测绘地理信息公益性行业科研专项"地名地址地理位置模型及可视化表达关键技术"(201512020)
