Research On Key Technologies Of High Precision Positioning Used In Hazardous Production Inspection

Petroleum and chemical industry is an extremely important foundation and pillar industry in our country.In recent years,heavy accidents happen frequently in the hazardous field,which urgently needs to promote the modernization of hazardous chemicals safety management system and management capacity.In a hazardous production scenario,to ensure the safety of inspection personnel and operation standards,it is necessary to locate the device with high precision.Common indoor positioning technologies,such as UWB positioning technology,often require the deployment of base stations,high cost and complex installation,while Bluetooth beacon positioning in complex indoor environment,positioning accuracy is greatly reduced.Therefore,a highprecision positioning key technology which is easy to install and has high positioning accuracy is needed for critical production inspection.In view of the above requirements,this thesis carried out research on the key technologies of high-precision positioning used in hazardous production inspection,and realized the high-precision positioning in hazardous production inspection scenarios.The main work of this thesis includes:1.Aiming at special inspection areas such as dangerous scenes,this thesis designs a low-power non-inductive inspection method for dynamic low-frequency sources.Inspectors wear low-frequency emission sources and obtain location information through beacons placed in the inspection area to realize non-inductive location of inspectors.2.Aiming at the problem that the performance of the maximum likelihood estimation algorithm based on multi-beacon RSSI ranging in the low-frequency induction beacon positioning system is easily affected by the metal environment,this thesis proposes a method to locate cooperative targets by probability distribution.The method firstly calculates the probability that the unpositioned source is located at each point within the range of beacon induction,and then obtains the location of the unpositioned source through the coordinates of the point with the maximum probability in the search area.Experimental results show that in the presence of metal interference environment,the proposed algorithm has higher positioning accuracy than the traditional maximum likelihood localization algorithm,and the error can be within 3cm,and high precision localization can be realized.3.A set of system prototype matching the key technology of high precision positioning is developed.According to the overall scheme design of the positioning system,the hardware platform was completed after determining the chip selection of beacon and the chip selection of each module of the unpositioned source.Based on the hardware platform,a software program was designed to realize the functions of the unpositioned source and beacon.Finally,the PC terminal module was equipped with relevant positioning algorithm for positioning information processing.Finally,the high precision positioning system prototype for dangerous production inspection was developed.The above work has tested and analyzed the basic functions and positioning functions by simulating the hazardous production inspection scenario,and verified the key technology of high-precision positioning comprehensively through the prototype system,which is of great significance for the modernization of hazardous chemicals safety governance system and governance capability.