Design And Implementation Of Auxiliary Command System Based On Indoor Location

Cities have become the main places for people to produce and live.The spatial layout of large and medium-sized high-rise buildings in cities is complex,and the existing GPS can not provide accurate indoor positioning information.Once there is a need to carry out emergency actions with high demand for indoor positioning,such as falls and rescues for the elderly in nursing homes,fire fighting and anti-terrorism operations,there are the following pain points:1)It is difficult for indoor action personnel to quickly locate themselves and their teammates,and coordinate cooperation;2)It is difficult for the commander to know the dynamic position of the indoor operators and intuitively grasp the live situation.It adds a lot of blindness to the emergency action of indoor space.In order to respond quickly to indoor emergency requirements,this paper proposes a solution based on the indoor positioning of the auxiliary command system,which can assist the commander to grasp the live situation,assist the action personnel to determine the location of themselves and teammates,and help the indoor and outdoor personnel to cooperate with the action.In terms of hardware design,the hardware design scheme of Bluetooth 5.0+DC independent power supply is proposed,which overcomes the shortcomings of UWB,Wi-Fi and RFID technology,such as high power consumption,high cost,portability and so on,and can well cope with emergencies such as power damage in emergency operations.In software design,Apache+PHP+MVC+MySQL development framework is adopted,and a software system with real-time location sharing and site sharing features is developed,which can assist commanders to grasp the indoor scene situation.In the research of core positioning algorithm,a method combining Gaussian mean filtering algorithm and three-dimensional trilateral positioning algorithm is proposed.The Gaussian mean filtering algorithm overcomes the shortcomings of Bluetooth being susceptible to interference and insufficient stability.The average variation range of RSSI receiving values is reduced from about 8dBm to 3dBm,and the filtering efficiency is im proved by about 62.50%,which provides a guarantee for obtaining a high precision ranging model.The three-dimensional trilateral positioning algorithm improves the robustness,applicability and positioning accuracy of the algorithm from the theoretical level and the development usability level.The average positioning error is reduced from 1.299 meters to 0.921 meters,and the positioning accuracy is improved by 29.11%.