High Range Digital Angular Rate Sensor Based On Frequency Modulations
Tech ID: 21673 / UC Case 2011-199-0
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:
- analog output
- narrow bandwidth linear range and
- temperature sensitivity
Currently these problems are solved by:
- digitizing the inherently analog output signals (which increases the power consumption and degrades noise performance)
- sensors (which results in temperature lags and hysteresis).
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||Published Application||20130098153||04/25/2013||2011-199|
- Shkel, Andrei M.
- Trusov, Alexander A.
- Zotov, Sergie A.
ADDITIONAL TECHNOLOGIES BY THESE INVENTORS
- Micromachined Gyroscope Design Allowing for Both Robust Wide-Bandwidth and Precision Mode-Matched Operation
- Micromachined Tuning Fork Gyroscopes With Ultra-High Sensitivity And Shock Rejection
- Three-Dimensional Wafer-Scale Batch-Micromachined Angle/Angular Rate Microshell Resonator Gyroscope
- 3-D Folded MEMS Technology For Multi-Axis Sensor Systems
- Multi-Axis Chip-Scale Mems Inertial Measurement Unit (Imu) System Based On Frequency Modulation