Research And Design Of Field Operator Search System

With the development and improvement of positioning technology,people need to obtain the location information of moving people or objects in more and more harsh environments,so as to search for the above-mentioned personnel when necessary.For example,researchers,mountaineers,railway inspectors engaged in scientific research in the field.The environment they are in is often very bad.At the same time,due to the lack of GSM and GPRS mobile network signals,it is easy to get lost.At this time,it is particularly important to get their location information and search for them.In response to the above problems,this paper carried out a research on the field operator search system based on GPS/Beidou dual-mode positioning and LoRa wireless communication.The field operator search system includes satellite navigation and positioning technology,wireless communication technology and geographic information technology.The system has very important application value for monitoring and searching the specific location of field staff when necessary.Base on GPS/Beidou dual-mode positioning technology and LoRa wireless communication technology,this paper formulates the overall design plan,design goals and specific design methods of the field operator search system.This article uses STM32F407 as the main control chip,through GPS/Beidou dual-mode positioning module,LoRa wireless communication module,antenna module and other peripheral circuit modules,to jointly realize the hardware design of the handheld terminal.In the uVision5 IDE integrated development environment,the embedded C language is used for software programming of the handheld terminal,which realizes the reception processing and analysis of the positioning information data of the main control chip,and sends text information to the upper computer monitoring terminal through the touch LCD screen.The WM8978 chip performs voice recording into a data file and packages it to the LoRa transmitter module to send data information to the upper computer monitoring end.Finally,the parameter configuration of the LoRa transmitting module and the receiving module is configured to realize the function of sending and receiving the information data extracted by parsing.The monitoring terminal of the host computer is developed using Qt software,and the interface for receiving data information is designed through C++ language.Using HBuilder software to achieve the function of latitude and longitude conversion.At the same time,the function of converting the latitude and longitude under Baidu coordinate system to a specific position on the map is realized using Java language,and the data interaction design between the modules is completed.The functions of receiving personnel's latitude and longitude information and displaying personnel's position are realized.Finally,the host computer function of the field worker search system was tested.The results show that the host computer display interface works well,can reliably receive the data information sent by the staff and can display the location of the staff on the Baidu map.In the system communication quality test,system positioning accuracy test and handheld terminal power consumption test,the test results have reached the expected goal.The results show that the field worker search system has the advantages of supporting voice and text broadcast information,long communication distance,accurate location of Baidu map display,and high positioning accuracy.It can meet the needs of monitoring the position of field workers,and provides a search for the above personnel when necessary.Effective solution.