Self-calibrating three axis angular rate sensor

Measuring and testing – Speed – velocity – or acceleration – Angular rate using gyroscopic or coriolis effect

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73 1D, 36457104, 36457105, 364564, G01P 348, G01P 2100

Patent

active

055311156

ABSTRACT:
A self-calibrating three axis angular rate sensor in which a single proof mass is supported from an outer case by a set of spring elements having substantially equal mechanical translational spring rates in all directions. Each axis is electromechanically coupled such that each of three sets of electrical terminals acts as a combined electrical driving and electrical detection means with respect to motion of the proof mass. The proof mass motion in combination with a general three axis angular rate input results in coriolis forces acting upon the proof mass. When the electrical terminals are driven with a multiplicity of additive sinusoidal time function electrical voltages, measurements of these voltages and resulting electrical currents comprise observable data for a computed extraction of three axis angular rate inputs. In addition, the computed extraction provides an accurate measure of variations of electrical parameters of the electromechanical coupling, of variations of mechanical translational spring rates and damping parameters, and of variations of electromechanical coupling coefficients of the set of spring elements. The computed extraction results in outputs of three axis angular rate which are substantially independent of these electrical and mechanical parameter variations. The measurements of electrical and mechanical parameter variations are compared with their respective nominal values in order to establish an overall data validity check.

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