Closed-loop baseband controller for a rebalance loop of a quartz angular rate sensor
US5400269A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 20, 1993 |
| Grant date | Mar 21, 1995 |
| Priority date | — |
| Expiry date | Sep 20, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P15/18
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A sensor such as a quartz angular rate sensor is operated in a closed-loop mode including feedback of a control signal. The sensor produces a modulated carrier frequency signal. For stable operation of the feedback loop, the control signal is obtained from the modulated carrier frequency signal by complex demodulation of the modulated signal to produce an in-phase demodulated signal and a quadrature-phase demodulated signal, and the in-phase demodulated signal and the quadrature-phase demodulated signal are filtered by a complex equalizing filter to produce an equalized in-phase signal and an equalized quadrature-phase signal. The equalized in-phase signal represents information sensed by the sensor, and phase of a demodulation reference signal is adjusted to minimize appearance of the information in the equalized quadrature-phase signal. The equalized in-phase and quadrature-phase signals are complex modulated at the carrier frequency to produce the control signal. To compensate for variable delay or phase shift through the feedback loop, the phase of the control signal is adjusted by a phase adjustment signal. For equalization of an angular rate signal from a quartz angular rate …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.