Construction And Simulation Method Of Pyroelectric Infrared Sensor Network Scene Oriented On Digital Twin

With the development of the Internet of Things and Internet technology,pyroelectric infrared sensors have been widely used in military reconnaissance,smart home and crowd behavior analysis due to their small size,low power consumption and non-invasion of privacy.The traditional crowd behavior analysis realizes the tracking,positioning and semantic extraction of crowd movement by virtue of its non-privacy Boolean data.However,due to its single Boolean data structure and limited information,the motion trajectory and semantic information extracted by the analysis algorithm and behavior model are incomplete or uncertain,and the limitation of data information also caused the lack of verification use cases.With the development of digital twins and virtual reality technology,digital information technology can build virtual scenes connected with physical scenes based on the actual environment of pyroelectric infrared sensor network scenes.Using the virtual scene of the sensor network can effectively simulate and generate the response data and motion information of the sensor network in the actual scene.Therefore,through the effective connection and fusion of the real world and the information world,the prediction and optimization problems of the sensor network deployment plan and the problem of incomplete information can be solved.However,in the process of constructing virtual scenes in sensor networks,traditional data representation methods are difficult to effectively solve the fusion expression of physical scene information,behavior simulation information and semantic coding information.In order to solve this problem,geometric algebra with the characteristics of multi-dimensional unified expression is introduced as technical support.This article will study the conceptual model of digital twins in depth and establish a conceptual model of sensor network scenarios for digital twins;And use geometric algebra theory as a tool to realize the unified expression and construction of sensor network scene models and crowd behavior models;Based on the characteristics of data expression,design the data organization and storage form of the sensor network scene model;Researched the path search mechanism and movement interaction rules of the crowd behavior model in a specific situation;Finally,the Mitsubishi Electric Research Laboratory was used as a physical object to construct a sensor network simulation scene,Verification and evaluation are carried out through the simulation of sensor network scenarios under specific scenarios.The research results of this paper mainly include the following aspects:(1)Conceptual model of sensor network scenarios.Analyze and discuss the concept and characteristics of the digital twin,analyze the mapping relationship between the physical scene and the virtual scene of the sensor network oriented on the conceptual model of the digital twin,and construct the conceptual model of the sensor network scene.(2)The expression method of network scene and crowd model based on geometric algebra.Through rasterization of sensor network scenes and crowd elements,with the help of geometric algebra multiple vector structure,k-blades structure and adjacency topology matrix,the unified expression of sensor network scenes and crowd elements is realized.(3)Movement rules and interaction mechanisms of crowd behavior models.According to the basic characteristics of crowd movement in a specific situation,design the movement rules and interaction mechanism of the crowd behavior model in the simulation process.Based on the path expansion mechanism and heuristic algorithm of geometric algebra,the optimal path search algorithm of the crowd behavior model is designed.