| In the fields of indoor navigation,indoor positioning and path planning methods are the key factors affecting the quality of navigation.The development of a new generation of information technology has added new vitality to the research and application of indoor navigation.Building Information Modeling(BIM)and Augmented Reality(AR)technology can provide model and data support for indoor positioning methods and path planning algorithms by virtue of the characteristics of model "what you see is what you get" and rich three-dimensional spatial data information.Therefore,the thesis combines BIM and AR technology with indoor navigation,and proposes an indoor navigation method based on BIM and AR technology.Firstly,the indoor space model is constructed by BIM technology,and the data information of model components is analyzed based on the IFC standard,and AR identification nodes are selected to construct an indoor navigation road network.Secondly,based on the navigation road network,the indoor positioning and path planning are studied,and an indoor positioning method and IARA algorithm based on BIM and AR technology are proposed,which realizes indoor positioning and navigation.Finally,based on the data model,navigation road network,IARA algorithm,etc.,the indoor navigation system based on BIM and AR technology was developed,and the practical application was carried out in the project to verify the feasibility of the indoor navigation method based on BIM and AR technology.The specific work is as follows:1.The thesis obtain Industry Foundation Class(IFC)data and process it.Use BIM for model building,and use the Spatial Map function of the EasyAR program to scan indoor buildings to generate point cloud data by sensors such as mobile phone cameras.The indoor navigation model is analyzed based on the IFC standard,and the data extraction,classification and storage are completed.2.The thesis constructed an indoor navigation road network based on BIM and AR technology.Based on the BIM model and AR identification nodes,the navigation nodes are selected according to the extracted semantic information data,and the spatial division is performed after mapping to complete the construction of the indoor navigation road network.3.The thesis proposes an indoor positioning method based on BIM and AR technology.The camera calibration is completed based on the vision and inertial navigation and positioning in AR technology.The Revit coordinate system was introduced,and the coordinate system conversion was carried out under the premise of a constant Revit measurement base point,and the different position coordinates of the AR identification nodes were obtained,and the node matching was completed,and Indoor positioning based on BIM and AR technology is realized,and the algorithm is verified by taking the negative floor area of the subway station as an example.4.The thesis proposes the IARA algorithm.The IARA algorithm is proposed based on the ant colony algorithm,according to the BIM-AR indoor navigation road network,the multi-objective optimization parameters such as the number of AR identification nodes,the utilization rate and the path distance are introduced,and the algorithm is verified by taking the negative floor area of the subway station as an example.5.The thesis studies BIM and AR integration methods.Using the indoor data parsed by IFC,based on the element ID association mechanism,the comparison of semantic and geometric information is completed,and the integration of BIM and AR is realized.6.In the thesis,an indoor navigation system based on BIM and AR technology is constructed and applied.The overall architecture and detailed functions of the indoor navigation system are designed,developed based on Unity and EasyAR software,and the indoor AR navigation,BIM-AR model overview and other functions are realized,and practical applications are carried out.The application results show that the indoor navigation method based on BIM and AR technology proposed in the thesis is feasible. |
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