Aiming at requirements of high precision during cross region and long time running

system miniaturization

and user interface friendly

a vehicle-oriented barometric altimeter system based on STM32 hardware platform is designed.In this system

high precision silicon piezoresistive pressure sensors

pitot tube and related pipeline is used to make up of gas path system for air static pressure sampling

and through embedded real time operating system（RTOS） μC /OS-II and graphical user interface（GUI） μC /GUI

realize displaying of user interface based on multitask.Experimental results show that after being real time calibrated

vehicle-oriented barometric altimeter for long time running has high measurement precision prior to 1.2 m which well meets the height positioning precision requirement for barometric altimeter used by vehicles.