Study on measurement free fall posture and height of a mobile device using MEMS sensors

The mobile device may cause damage such as circuitry, panel, glass, case by the impact caused by free fall in the user environment. The manufacturers have a tumble and drop test in order to verify the impact safety of the mobile device. In this study, the built-in mobile device magnetometer, gyroscope, accelerometer information developed by utilizing an algorithm to measure the height and the posture at the time of drop impact occurs in the tests and user environment. Falling posture measurement algorithm was validated through a high-speed camera and measured sensor data processing results compared. Drop height measurement algorithm was validated at a constant height drop tests at 50 to 130 cm.