Gyro sensor and electronic apparatus
US-9222776-B2 · Dec 29, 2015 · US
High range digital angular rate sensor based on frequency modulation
US8991247B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8991247-B2 |
| Application number | US-201113279212-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 21, 2011 |
| Priority date | Oct 21, 2011 |
| Publication date | Mar 31, 2015 |
| Grant date | Mar 31, 2015 |
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Abstract
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A digital angular rate sensor system 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 disclosed 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 nature of the system eliminates noise versus bandwidth and resolution versus dynamic range tradeoffs of conventional vibratory rate gyroscopes. The FM approach allows achieving superior signal-to-noise-ratio through the use of ultra-high Q (1 million) mechanical structure without limiting the measurement bandwidth. Stability of 1e-9 can be achieved in the FM system, providing a 1000 times improvement over the state-of-the-art conventional AM gyroscopes with capacitive pick-off.
First claim
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We claim: 1. A method for operating a Class II Coriolis Vibratory Gyroscope (CVG) comprising: producing a frequency modulated (FM) measurement of an input rotation rate which is produced comprising the steps of: measuring a change in a modal frequency; or measuring a split between two nominally matched modal frequencies, wherein measuring the change in a modal frequency or the split between two nominally matched modal frequencies comprises performing independent frequency c…
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- G01C19/5719Primary
Physics · mapped topic
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- What does patent US8991247B2 cover?
- A digital angular rate sensor system 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 disclosed system is enabled by a combination of a MEMS vibratory high-Q gyroscope and a n…
- Who is the assignee on this patent?
- Trusov Alexander, Zotov Sergei, Shkel Andrei, and 1 more
- What technology area does this patent fall under?
- Primary CPC classification G01C19/5719. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Mar 31 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).