Development of position calculation method using elevation data by barometric pressure sensor

Abstract

The global navigation satellite system (GNSS) is used to help people get from A to B by determining the position of us and the vehicles we use for travel. However, there are issues surrounding the GNSS, including its accuracy. This is due to a variety of factors that can cause radio waves coming in from satellites to experience poor reception. In addition, cybercrime is a concern for the GNSS as with cybercriminals becoming more sophisticated, they could one day interfere with the satellite system, which would cause havoc. Dr Takayoshi Yokota, Graduate School of Engineering, Tottori University, Japan, is working to overcome these challenges by developing a method for estimating the position of a travelling vehicle based on altitude profile, driving behaviour, road surface roughness and changes in inclination. Yokata and his team are working to enhance the effectiveness of Micro Electro-Mechanics System (MEMS) sensors. This work involves developing a position calculation method using elevation data by barometric pressure sensor as altitude can be indirectly measured using pressure sensors and this is a convenient method as these sensors are embedded in most smartphones. In order to aid localisation, acceleration data and angular velocity data are required along with a pressure reading that can be used to calculate altitude. Yokota anticipates that drivers will benefit from the technology in due course.