DIGITAL METHOD AND SYSTEM FOR DETERMINING THE INSTANTANEOUS PHASE AND AMPLITUDE OF A VIBRATORY ACCELEROMETER AND OTHER SENSORS

摘要

A system for determining the instantaneous amplitude and phase of an analog sinusoid (Fig. 1) includes a sensor which produces the analog sinusoid output in response to the measurement of a parameter, and analog-to-digital converter (14) which receives the analog sinusoid for the sensor and converts the analog sinusoid to a digital sinusoid, a delay device (18) which receives the digital sinusoid and produces an in-phase signal associated with the digital sinusoid a transformer (24) which receives the digital sinusoid and produces a quadrature signal associated with the digital sinusoid by introducing a phase shift plus a delay to the digital sinusoid, an amplitude computation device (26) which receives the in phase I and quadrature Q signals and computes the instantaneous amplitude of the digital sinusoid by processing the I and Q signals and phase computation device (20) which receives the I and Q and compute the instantaneous phase of the digital sinusoid by processing the I and Q signals.