Displacement Sensing and Bluetooth LE Indoor Navigation

Hiew, Weng Keat (2015) Displacement Sensing and Bluetooth LE Indoor Navigation. Final Year Project (Bachelor), Tunku Abdul Rahman University College.

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Abstract

A smartphone with Bluetooth LE enabled can be used to receive signals. With minimum of three emitters, a receiver can infer its position through estimated distance based on Receive Signal Strength Index (RSSI) / signal strength from known locations (emitters). We are going to use inertial navigation which is based on measuring accelerations and rotations/orientations. The term inertia indicates an object’s tendency to continue its motion if no external forces are applied to it. In inertial navigation, an accurate reference location is firstly required. Then, the acceleration and orientation of the inertial navigation system (INS) are measured with linear acceleration sensors (accelerometers) and angular velocity sensors (gyroscopes). By integrating this information about the motion, the INS can determine the user’s position, velocity, and orientation. Motion sensors suitable for inertial navigation are available in various accuracy, quality and price grades, depending on which kind of technology is utilized. Motion sensors implemented with a low-cost technology called Micro Electro Mechanical Systems (MEMS) are increasingly common in various consumer products. This enables a vast number of possibilities for inertial positioning.