Patent ID: 7710576
Filing Date: 2010-05-04
Classification: G01C

Abstract:
1. A system for determining a level of angle random walk (ARW) associated with a fiber optic gyroscope (FOG), the system comprising: first and second photodiodes, said first photodiode configured to receive a first light signal from a light source associated with the FOG, said second photodiode configured to receive a second light signal from a fiber optic coil associated with the FOG; at least one analog-to-digital converter (ADC) operable to convert the first and second light signals into corresponding respective first and second digital signals; a digital relative-intensity-noise (RIN) subtraction element configured to receive said first and second digital signals and output a third signal based on said first and second digital signals; and an electronic device in signal communication with said subtraction element, said electronic device configured to determine a first noise level associated with the third signal, and determine the ARW level from said first noise level.