Research On Road Workers Safety Warning System Based On People-vehicle-road

With the rapid development of social economy in our country,the road transportation industry has entered a golden period of development.The number of road vehicles and highway mileage has increased significantly,road traffic operation is an important guarantee to ensure smooth traffic,the people of road operation are special and large groups.But because this kind of people are lack of effective protection measures,there are often road traffic accidents to them.In view of the above problems,the paper studies the road safety early warning system based on people-vehicle-road,designs an embedded security warning system based on STM32F407,which can effectively carry out road safety early warning,help the driver to perceive the danger in time,and take the reasonable operation.This system has certain theoretical significance and practical value to ensure traffic safety and solve the security problem of road workers.This paper studies the road workers safety early warning model based on people-vehicle-road,and analyses the driver behavior characteristics,proposes the driver behavior model based on "perceptual-cognitive-response".The drivers previously perceive the external road environment,predict the possible damage,and take the safe driving operation to reduce the traffic accident.Through studying on the braking process of vehicle and safe distance,the study proposes safety distance model based on vehicle braking distance,and optimizes the calibration parameters in the model.In order to achieve a good warning effect,the paper sets reasonable critical warning distance and puts forward multi safety warning model based on safe-distance.The safety warning model as the theoretical support,this paper introduces the design of an embedded system,which is constituted a main control chip based on STM32F407,GPS and 433 M communication module for information acquisition unit,intelligent voice and TFT LCD module as a human-machine interaction unit.The system can be capable of real-time acquisition,process of road operation data and realize of the road workers security warning operation.This paper describes the overall system design,software and hardware design.The system is mainly divided into three parts:(1)the main control unit,which uses 32 bits STM32F407ZGT6 as the main control chip and processes real-time data accurately,coordinates each sub modules orderly;(2)the information acquisition unit,which are mainly GPS and 433 M wireless communication module,the GPS module is used for collecting operation location,vehicle location,speed and other information,the 433 M communication module realizes the information transmission function between vehicle and operation area;(3)the hu-man-machine interaction unit,which can input external command and delivers warning information after system processing,early warning information are displayed in the form of text and voice prompt,that drivers can detect potential danger and realize security early warning functionLast the paper conducts simulated scene and actual vehicle test,verifies the reliability of the system operation,through the analysis of experiment data,this system can realize the road information delivery by timely warning processing and accurate operation,basically meets the design requirements of security early warning.