| Location Based Service becomes indispensable to people in daily life.Unlike the outdoor positioning,the satellite positioning program can not be applied because of the wireless signal shielding effect in indoor positioning.Acquiring indoor location information accurately becomes the critical technical issues to be solved in achieving the location service.Currently,there are many technologies available for indoor positioning,including RFID,Bluetooth,Infrared,UWB,ZigBee,WiFi and Pedestrian Dead Reckoning and so on.The Pedestrian Dead Reckoning technology is a relative positioning technology based on sensor,which is not affected by external environment,can achieve self-positioning with high accuracy.According to people requirement of position accuracy and continuity for indoor environment,a kind of inertia indoor positioning scheme based on Android mobile terminal was proposed in this paper.Now,smart phones are becoming more and more popular,and most of them are equipped with acceleration sensors and electronic compass,so using smart phones combined with pedestrian track projection technology to achieve indoor positioning becomes a research hotspot.In this paper,the built-in inertial device of Android intelligent terminal is used to collect data,detecting pedestrian pace,step size and course through the accelerometer,gyroscope and electronic compass data,then JAVA language is adopted to indoor positioning system in Android terminal according to pedestrian dead reckoning principle.System testing is carried out in the indoor environment,the experimental results show that the system can basically meet the needs of indoor mobile positioning. |
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