Single axis rate sensor noise reduction

Details Single axis rate sensor noise reduction Single axis rate sensor noise reduction

1993-04-09

1995-05-30

Williams, Hezron E.

Measuring and testing

Speed, velocity, or acceleration

Angular rate using gyroscopic or coriolis effect

G01P 904, G01P 15125

Patent

active

054191947

ABSTRACT:
A single axis rate sensor comprising a cylinder positioned about an axis and having primary and secondary drive and pick-off transducers and primary and secondary control loops. The primary control loop is provided for maintaining resonance of the cylinder by generating a ninety-degree phase shift between the primary drive transducer and the primary pick-off transducer. The secondary control loop is provided for receiving a signal from the secondary pick-off transducer indicative of rotation of the cylinder and for nulling the secondary drive transducer to zero. The primary control loop includes a phase-locked loop having a phase detector configured to operate at quadrature. By operating the demodulator in quadrature the demodulator and loop filter combination are a linear device which will not mix the microphonic baseband signal with the carrier. There will therefore be a reduction and possibly an elimination of the modulation of the voltage controlled oscillator by microphonic noise.

REFERENCES:
patent: 4996877 (1991-03-01), Stewart et al.
patent: 5218867 (1993-06-01), Varnham et al.
patent: 5226321 (1993-07-01), Varnham et al.

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