Xsens

MTi
~ MTi is a miniature, gyro-enhanced Attitude and Heading Reference System (AHRS)
~ Its internal low-power signal processor provides drift-free 3D orientation as well as calibrated 3D acceleration,
~ 3D rate of turn (rate gyro) and 3D earth-magnetic field data
~ MTi is an excellent measurement unit for stabilization and control of cameras, robots, vehicles and other equipment

Features
~ accurate full 360 degrees 3D orientation output (Attitude and Heading)
~ highly dynamic response combined with long-term stability (no drift)
~ 3D acceleration, 3D rate of turn and 3D earth-magnetic field data
~ all solid state miniature MEMS inertial sensors inside
~ compact design
~ high update rate
~ various digital or analog output modes
~ accepts or generates synchronization pulses
~ temperature, 3D misalignment and sensor cross-sensitivity compensated

MTi uses 3 rate gyros to track rapidly changing orientations in 3D and it measures directions of gravity and magnetic north to provide a stable reference
systems real-time algorithm fuses sensor information to calculate accurate 3D orientation, with a highly dynamic response and stable over time

Delft Dynamics
~ MT9 is a very important element in helicopter - without orientation, helicopter would never be able to correct its orientation autonomously if needed
~ MT9 data is used to compute pitch, roll and heading open communication code of MT9 SDK makes it possible to synchronize MT9 with GPS
~ combination of accelerometers, magnetometers and gyroscopes makes orientation accurate during static operation,
~ such as hovering, but also when helicopter is moving
~ low power consumption, size and weight of MT9 are essential
~ a higher grade orientation sensor would just not fit in helicopter or would decrease operating time, because of higher power consumption