SensorDynamics, Graz, Austria, offers a wireless inertial measurement system that combines a mobile sensor unit and a receiver. The 30 by 85 by 8 mm sensor unit uses the company's SD787 and SD788 angular rate sensors and accelerometers with integrated signal processing; it also includes an SD430 transceiver chip for ISM band frequencies of 315, 433, 868, and 915 MHz and can wake up from a 21 kHz signal. The wireless measurement system has a calibrated measurement range of ±300°/s for rotary rate and ±2 g for acceleration on all three axes, withstands shock up to 2000 g, integrates a 2D compass for absolute orientation, and features continuous self-diagnostics. Synchronous wireless transmission of measured values uses standard FMSK modulation over the 433 MHz band at 125 Kbps. 32 KB of flash memory supports the RF circuit.
Wireless IMU from SensorDynamics