查看文章

Methods We designed a new sensor system based on available low power components. It contains an inertial measurement unit (IMU) including a 3-dimensional accelerometer, gyroscope and magnetometer. Furthermore, temperature and barometric sensing were added. The core is a powerful ARM Cortex-M3 microcontroller with on-node processing capabilities. Sensor data is stored using a NAND flash memory, while an EEPROM stores permanent configurations. The system is powered by a small lithium-polymer battery which provides long runtime and is monitored by a special fuel gauge. A high precision real time clock enables a constant sampling rate and synchronises multiple sensors by supplying an exact global time. These are important features to allow sophisticated signal processing algorithms to be used on highly dynamic sports motions. All parts are mechanically combined in a plastic enclosure …