Pseudorandom-bit-sequence modulated fiber-optic gyro

Details Pseudorandom-bit-sequence modulated fiber-optic gyro Pseudorandom-bit-sequence modulated fiber-optic gyro

1999-02-22

2000-09-05

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01C 1972

Patent

active

061151254

ABSTRACT:
The invention is a method and apparatus for determining the rotation of a medium through which a light beam propagates by modulating the light beam with a primary pseudorandom bit sequence consisting of a plurality of contiguous P subsequences. Each P subsequence consists of a start sequence of predetermined length followed by a sequence of trailing bits. The method comprises three steps. The first step consists of deriving a feedback bit from each generating sequence in a P subsequence in accordance with a specified rule where a generating sequence is any sequence of contiguous bits in the P subsequence having the same length as the start sequence. The bit that follows a generating sequence is called the trailing bit for that generating sequence. The second step of the method consists of determining a sequence of one or more modifier bits to be used in modifying the P subsequence. The third step of the method consists of modifying the P subsequence utilizing the one or more modifier bits.

REFERENCES:
patent: 5682241 (1997-10-01), Mark et al.

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