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US 10,502,585 B2Granted
Gyro rate computation for an interferometric fiber optic gyro
AssigneeThe Boeing Company
InventorsShaun M. Detloff, James K. Gingrich
Life of this patent
Estimating the term…
Abstract
A method comprises supplying an optical input to an interferometric fiber optic gyro (IFOG) at a first frequency and then a different second frequency; detecting a difference in responses of the IFOG to the optical input at the first and second frequencies; and computing a gyro rate as a function of the difference and a correction term.
Claims14
A method comprising:
- supplying an optical input to an interferometric fiber optic gyro (IFOG) at a first frequency and then a different second frequency;
- detecting a first phase variation between counter-propagating optical signals at the first frequency;
- detecting a second phase variation between counter-propagating optical signals at the second frequency;
- detecting a difference in the first phase variation and the second phase variation of the IFOG to the optical input at the first and second frequencies;
- determining a rotation of the IFOG based on a gyro rate, wherein the gyro rate is a function of the difference and a correction term.
2 more elements
A system comprising:
- an interferometric fiber optic gyro (IFOG);
- a fiber optic light source for supplying an optical input to the IFOG at a first frequency and then a different second frequency;
- a photodetector for detecting a first phase variation between counter-propagating optical signals at the first frequency and a second phase variation between counter-propagating optical signals at the second frequency of the IFOG to the optical input;
- and
- a processor for determining a rotation of the IFOG based on a gyro rate as a function of a difference of the first and second phase variation and a correction term.
2 more elements
A method for an interferometric fiber optic gyro (IFOG) comprising:
- applying a known rate to the IFOG and determining IFOG scale factors for optical inputs at first and second frequencies;
- providing an optical input to the IFOG at the first frequency and detecting a first phase variation between counter-propagating optical signals at the first frequency of the IFOG;
- switching the optical input to the second frequency and detecting a second phase variation between counter-propagating optical signals at the second frequency of the IFOG;
- and
- using a difference between the first and second phase variations, the known rate, and the scale factors to determine an IFOG correction term representing a sum of time-dependent errors in the first and second IFOG phase variations.
2 more elements
Dependencies are inferred from the claim text.