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Method for improving the performance of fiber-optic gyros
Method for improving the performance of fiber-optic gyros
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机译：改善光纤陀螺仪性能的方法
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摘要
The invention is a method for improving the performance of a fiber-optic gyro comprising counter-propagating light beams from a broadband source in an optical fiber configured as a coil. The fiber-optic gyro is of the type where the phases of the light beams are step-modulated at one or both ends of the optical fiber at time intervals equal to the light propagation time τ through the optical fiber, the step being in the range from 0 to 2π-δ radians where δ is an infinitesimal. The step is the sum of an estimate of the Sagnac phase residual φSE with reversed sign and the quantity (2πk + jφM) where the index k can take on the values -1, 0, and 1, and the index j can take on the values -1 and 1. The phase angle φM is a positive constant less than π radians. The method comprises the steps of determining the interferometer output light intensity, determining the Sagnac fringe number n , calculating the error Pnkj in the interferometer output light intensity attributable to the use of a broadband light-beam source for particular values of an index pair (k,j), determining estimates Akj of the probabilities of the index pairs (k,j) by counting the occurrences of each index pair (k,j) over a period of time, and determining the bias ε in the output of a fiber-optic gyro. The bias ε can be made independent of the Sagnac fringe number by proper design of the statistical properties of the phase modulating function.
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机译：本发明是一种用于改善光纤陀螺仪性能的方法，该方法包括在配置为线圈的光纤中使来自宽带源的光束反向传播。光纤陀螺仪是这样一种类型的，其中光束的相位在光纤的一端或两端以与通过光纤的光传播时间τ相等的时间间隔进行阶跃调制。从0到2π-δ弧度，其中δ是无穷小。该步骤是对带反转符号的Sagnac相残差φ SE 和数量（2π k + j φ M ），其中索引 k 可以取值-1、0和1，索引 j 可以取值-1和0。 1.相角φ M 为小于π弧度的正常数。该方法包括以下步骤：确定干涉仪的输出光强度;确定Sagnac条纹数 n ;计算误差 P nkj <干涉仪输出光强度中的/ Sub>归因于对索引对（ k，j ）的特定值使用宽带光束源，从而确定估计值 A 通过计算每个索引对（ k，j <的出现次数）的索引对（ k，j ）的概率的 kj / I>），并确定光纤陀螺仪输出中的偏差ε。通过适当设计相位调制函数的统计特性，可以使偏差ε与Sagnac条纹数无关。
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