An FM gyroscope with inherently digital output. Tradeoff between quality factor and range and bandwidth is eliminated, allowing the use of ultra-high Q for improved noise performance without limiting the bandwidth and range. Temperature is self-sensed and self-calibrated, so the hysteresis and lags are eliminated.
Conventional gyroscopes suffer from the following major limitations:
Currently these problems are solved by:
UCI researchers have developed a digital angular rate sensor based on frequency modulation (FM) of the rotation rate. The new approach relies on tracking of the resonant frequencies of two high-Q mechanical modes of vibration in a MEMS vibratory gyroscope to produce an inherently digital measurement of the input angular rate. The system is enabled by a combination of a MEMS vibratory high-Q gyroscope and a new signal processing scheme which takes advantage of a previously ignored gyroscope dynamics effect. The FM architecture eliminates noise vs. bandwidth and resolution vs. dynamic range tradeoffs of conventional vibratory rate gyroscopes, which are based on analog AM dynamics and signal processing.
The FM approach allows for achieving superior signal-to-noise-ratio through the use of ultra-high Q (1 million) mechanical structure without limiting the measurement bandwidth.
The sensor can be used in any application requiring precise and stable detection of inertial rotation, including motion control, flight guidance, and inertial navigation.
Advantages of the UCI sensor system over the current state-of-the-art are wide linear (72,000 deg/s) and dynamic (>150 dB) ranges, wide bandwidth (>100 Hz), temperature stability, and robustness to mechanical and electromagnetic interferences.
|United States Of America||Issued Patent||8,991,247||03/31/2015||2011-199|