Research And Application Of Geomagnetic Indoor Navigation Technology On Mobile Terminal

As mobile devices such as mobile phones become more common in today's society,there is a growing demand for location-based services,and GPS satellite positioning plays a vital role in location-based services,but the use of GPS positioning and navigation has a fatal shortcoming,is unable to meet the requirements of indoor navigation.Because large buildings tend to have very thick walls,satellite signals can not pass through.But as MEMS sensors,such as accelerometers,magnetometers,gyroscopes,are increasingly being installed in smartphones,sensors in mobile phones can detect pedestrian movement and indoor environments.For example,in a show,the person who use indoor navigation to find the route of target area and the friends who use same service.In recent years,geomagnetic navigation and geomagnetic detection technology has a rapid development,geomagnetic navigation as a high-precision navigation technology,is becoming increasingly evident.The benefits include high-precision,all-weather,continuous navigation.Based on the above characteristics of geomagnetic navigation,more and more studies are focused on the use of geomagnetic positioning technology for indoor navigation.Because the geomagnetic matching technology is the key of geomagnetism indoor location,this paper firstly studies the construction of geomagnetic map model and the geomagnetic matching algorithm,and introduces the commonly used geomagnetic matching algorithm,including deterministic and probabilistic algorithms and their limitations.Then the paper introduces the algorithm of geomagnetism-based region determination.The experimental results show that the scheme has good performance under the condition that the accuracy basically meets the requirement of indoor location.Then this paper applies the ant colony algorithm to find the path of 2D map,and proposes an optimization scheme for the ant colony algorithm in the mobile terminal.At last,the design and implementation of the mobile terminal geomagnetic indoor navigation system and an instant communication system based on XMPP protocol are given.The system is tested with different use cases.The test result proves that the system can run smoothly on the Apple smartphone.And the function and performance of the system meet the design requirements.