Accession Number : ADD016556
Title : Low Noise Fiber Gyroscope System which Includes Excess Noise Subtraction.
Descriptive Note : Patent, Filed 30 Nov 92, patented 19 Jul 94,
Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC
Personal Author(s) : Moeller, Robert P ; Burns, William K
Report Date : 19 Jul 1994
Pagination or Media Count : 10
Abstract : A system and method for subtracting excess noise from a high sensitivity gyroscope system in which a laser diode array is focused into an Nd-doped active fiber. A resultant gyro signal is polarized, detected, and amplified. A noise signal is polarized, delayed, detected, and amplified such that the noise signal is polarized parallel to the gyro signal and delayed by a fiber delay, of a length equal to a length of a gyroscope fiber coil. The excess noise component in the amplified gyro signal is reduced by modulating the amplified noise signal with a portion of the amplified gyro signal and subtracting the amplitude-modulated noise signal from the amplified gyro signal to produce a reduced noise gyro signal.
Descriptors : *GYROSCOPES, *PATENTS, *LOW NOISE, *FIBER OPTICS, ARRAYS, COILS, DELAY, DIODES, HIGH SENSITIVITY, LASERS, LENGTH, NOISE, SENSITIVITY, SIGNALS, NEODYMIUM, DOPING, POLARIZATION, DETECTION, AMPLIFICATION, MODULATION, RANDOM WALK
Subject Categories : Fiber Optics and Integrated Optics
Navigation and Guidance
Distribution Statement : APPROVED FOR PUBLIC RELEASE