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公开(公告)号：US11079230B2
公开(公告)日：2021-08-03
申请号：US16409375
申请日：2019-05-10
IPC分类号： G01C19/72
摘要： One example includes a FOG assembly including a spool that includes a flattened portion corresponding to a flange comprising an axial center corresponding to a sensitive axis about which an associated FOG system is configured to measure rotation. The FOG assembly also includes a magnetic shield arranged as a capped concentric cover about the sensitive axis and coupled to the spool and the flange to create a toroidal cavity between the magnetic shield and the flange. A fiber coil is disposed within the toroidal cavity and coupled to the flange. The fiber coil includes an optical fiber which is counter-wound in first and second orientations. The fiber coil has an axial dimension along the sensitive axis that is less than or equal to approximately 160% of a radial width corresponding to a difference between an outer radius and an inner radius of the fiber coil.
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公开(公告)号：US10989535B1
公开(公告)日：2021-04-27
申请号：US16778589
申请日：2020-01-31
摘要： One example includes a fiber-optic gyroscope (FOG) system that includes a fiber coil. The coil includes an optical fiber wound around a spool of a FOG. The optical fiber includes a first input and a second input. The system also includes an optical beam controller comprising an optical switch that provides a first optical beam to the first input and a second optical beam to the second input during a first switching state, and provides the first optical beam to the second input and the second optical beam to the first input during a second switching state. The system further includes a controller that mitigates bias error in determining rotation of the FOG based on comparing the first and second optical beams output from the FOG during the first and second switching states.
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公开(公告)号：US06904377B2
公开(公告)日：2005-06-07
申请号：US10390200
申请日：2003-03-17
申请人： G. Kevin Liu , John Mark , Daniel A. Tazartes
发明人： G. Kevin Liu , John Mark , Daniel A. Tazartes
CPC分类号： G01C21/16 , G01C25/005
摘要： System and method for measuring force-dependent gyroscopic sensitivity. A force-effect model of the effects of acceleration on the output of a gyro triad is determined. Rotation sequences are then devised to permit excitation and observation of force-effect model parameters in order to provide calibration information for these parameters. A state diagram containing the gyro triad force-effect model parameters is derived from the force-effect model, where moving from one position in the state diagram to another position indicates the gyro triad error which would occur in rotating the gyro triad according to a corresponding motion. Searching for all possible closed loop paths achievable through the state diagram, by a multiple-axes rate table with a specified number of rotations, to separate gyro triad error calibration from the accelerometer calibration. Closed loop paths having minimal lengths and exhibiting larger error sensitivity are chosen to perform error parameter calibration and reduce force-dependent gyroscopic sensitivity.
摘要翻译： 用于测量力依赖陀螺仪灵敏度的系统和方法。 确定加速度对陀螺三能体输出的影响的力效应模型。 然后设计旋转序列以允许激发和观察力效应模型参数，以便为这些参数提供校准信息。 包含陀螺三能力力 - 效应模型参数的状态图从力 - 效应模型导出，其中从状态图中的一个位置移动到另一位置指示将根据相应的旋转陀螺仪三元组发生的陀螺仪三元组误差 运动。 通过状态图可以通过具有指定转数的多轴速率表搜索所有可能的闭环路径，从加速度计校准中分离陀螺仪三元组误差校准。 选择具有最小长度和显示较大误差灵敏度的闭环路径进行误差参数校准并减小力依赖陀螺仪灵敏度。
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公开(公告)号：US6115125A
公开(公告)日：2000-09-05
申请号：US255391
申请日：1999-02-22
IPC分类号： G01C19/72
CPC分类号： G01C19/72
摘要： 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.
摘要翻译： 本发明是用于通过用由多个邻接P子序列组成的主伪随机比特序列调制光束来确定光束通过其传播介质的旋转的方法和装置。 每个P子序列包括预定长度的开始序列，随后是后续位序列。 该方法包括三个步骤。 第一步包括根据指定规则从P子序列中的每个生成序列导出反馈比特，其中生成序列是具有与起始序列相同长度的P子序列中的连续比特的任何序列。 跟随生成序列的位称为该生成序列的尾随位。 该方法的第二步是确定用于修改P子序列的一个或多个修饰符比特的序列。 该方法的第三步包括利用一个或多个修饰词比特来修改P子序列。
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公开(公告)号：US5883716A
公开(公告)日：1999-03-16
申请号：US893961
申请日：1997-07-15
申请人： John G. Mark , Daniel A. Tazartes
发明人： John G. Mark , Daniel A. Tazartes
IPC分类号： G01C19/72
CPC分类号： G01C19/726
摘要： A closed-loop system for regulating a fiber optic gyroscope is configured so that the residual error of a so-called deadbeat system assumes a higher order function of frequency. The closed-loop gyro includes a rate controller within the feedback path. The rate controller receives the gyro output from the last loop transit corrected for d.c. offset and for nominal dither and outputs a gyro rate estimate. The rate controller includes a plurality of feedback integrators in cascaded relationship. In this way, the residual gyro error associated with inherent loop delay is elevated to a higher-order relationship to sensed gyro rate. As a result, a substantial reduction in residual error as a function of sensed gyro rate occurs throughout the range of operational gyro frequencies.
摘要翻译： 配置用于调节光纤陀螺仪的闭环系统被配置为使得所谓的失谐系统的残余误差假定频率的高阶函数。 闭环陀螺仪包括反馈路径内的速率控制器。 速率控制器接收从最后循环传输的陀螺仪输出。 偏移和用于标称抖动，并输出陀螺仪速率估计。 速率控制器包括多个级联关系的反馈积分器。 以这种方式，与固有环路延迟相关的残余陀螺仪误差升高到与感测陀螺仪速率的高阶关系。 结果，作为感测陀螺仪的函数的残余误差的显着减少发生在操作陀螺仪频率的整个范围内。
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公开(公告)号：US5604308A
公开(公告)日：1997-02-18
申请号：US589578
申请日：1996-01-22
CPC分类号： G01P15/13
摘要： A digital circuit for adapting the output of a closed-loop accelerometer to a utilization circuit where the cycle time of the rebalance loop of the accelerometer is unrelated to the cycle time of the utilization circuit. A register receives and stores a digital value representative of measured acceleration and a bank of serially-arranged divide-by-two counters accepts the output of the rebalance loop clock. A gate arrangement makes one-by-one correlations between the states of the register and the outputs of the divide-by-two counters. A trigger circuit receives the gate outputs, providing a pulse when triggered by a downgoing edge of a square wave output of the gate array. A counter receives the pulse stream and is gated, in turn, in accordance with the cycle time of the utilization circuit so that the accelerometer data employed therein is representative of the portion of the acceleration occurring during a cycle of the utilization circuit.
摘要翻译： 一种用于将闭环加速度计的输出适配到利用电路的数字电路，其中加速度计的重新平衡环路的周期时间与利用电路的周期时间无关。 寄存器接收并存储表示测量加速度的数字值，并且串行排列的二位计数器的存储体接受重新平衡环路时钟的输出。 门阵列在寄存器的状态和分频计数器的输出之间形成一个一个的相关性。 触发电路接收栅极输出，当由栅极阵列的方波输出的下降沿触发时提供脉冲。 计数器接收脉冲流，并且根据利用电路的周期时间进行选通，使得其中使用的加速度计数据代表在利用电路的周期期间发生的加速度的部分。
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7.发明授权
公开(公告)号：US5570304A
公开(公告)日：1996-10-29
申请号：US281348
申请日：1994-07-27
申请人： John G. Mark , Daniel A. Tazartes
发明人： John G. Mark , Daniel A. Tazartes
CPC分类号： G01C21/16 , Y10S388/902
摘要： A method for thermal modeling and updating of bias errors in inertial navigation instrument outputs relies upon piecewise cubic spline encoding of data. The temperature range of the thermal model is divided into contiguous intervals of equal length. Instrument bias-versus-temperature data is encoded on an interval-by-interval basis with all intervals normalized so that cubic polynomials of identical form may be fitted between boundary intervals defined by function values and slopes. Instrument bias error at a measured temperature is estimated in the field and an update point (bias, temperature) established. The particular interval is located and the thermal model is re-fit accordingly in the region of the relevant interval. The spline parameters are then adjusted to accommodate the estimated bias error thereby updating the instrument thermal model of bias.
摘要翻译： 惯性导航仪输出偏置误差的热建模和更新方法依赖于数据的分段三次样条编码。 热模型的温度范围分为相等长度的连续间隔。 仪器偏置温度数据以逐个间隔为基础进行编码，所有间隔都被归一化，使得相同形式的三次多项式可以在由功能值和斜率定义的边界间隔之间拟合。 在测量温度下的仪器偏置误差在现场进行估计，并建立更新点（偏置温度）。 定位特定的间隔，并且在相关间隔的区域内相应地重新拟合热模型。 然后调整样条参数以适应估计的偏差误差，从而更新仪器热偏置模型。
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公开(公告)号：US5521555A
公开(公告)日：1996-05-28
申请号：US279509
申请日：1994-07-25
CPC分类号： G01J1/44 , G01C19/721 , H03F3/082
摘要： An amplifier topology for receiving signals output from a fiber optic rotation sensor and producing voltages that may be processed to determine the rotation rate includes a photodiode for receiving an optical signal and producing a corresponding electrical photodiode output signal. An ultra low noise and ultra low capacitance differential input stage is connected to receive the photodiode output signal. An operational amplifier having low noise and ultra-wide bandwidth is connected to the ultra low capacitance differential input stage to receive the output signal therefrom as a driving signal and to produce a low noise output signal. The differential input stage comprises a first amplifier circuit that includes a first transistor connected to the photodetector to act as a first buffer having low noise, low capacitance and unity gain. The first amplifier circuit also includes a second transistor configured as a first voltage follower connected between the output of the first buffer and the operational amplifier to isolate the output of the first buffer from parasitic capacitive loading from a biasing network. The differential input stage further comprises a second a second amplifier circuit that includes a third transistor having an input connected to a reference potential, the third transistor acting as a second buffer having low noise, low capacitance and unity gain. The second amplifier circuit also includes a fourth transistor configured as a second voltage follower connected between the output of the second buffer and the operational amplifier.
摘要翻译： 用于接收从光纤旋转传感器输出的信号并产生可被处理以确定旋转速率的电压的放大器拓扑包括用于接收光学信号并产生相应的光电二极管输出信号的光电二极管。 连接超低噪声和超低电容差分输入级，以接收光电二极管的输出信号。 具有低噪声和超宽带宽的运算放大器连接到超低电容差分输入级，以将其输出信号作为驱动信号接收并产生低噪声输出信号。 差分输入级包括第一放大器电路，其包括连接到光电检测器的第一晶体管，以充当具有低噪声，低电容和单位增益的第一缓冲器。 第一放大器电路还包括被配置为连接在第一缓冲器的输出端和运算放大器之间的第一电压跟随器的第二晶体管，以将第一缓冲器的输出与偏置网络的寄生电容负载隔离开来。 差分输入级还包括第二个第二放大器电路，其包括具有连接到参考电位的输入的第三晶体管，第三晶体管用作具有低噪声，低电容和单位增益的第二缓冲器。 第二放大器电路还包括被配置为连接在第二缓冲器的输出端和运算放大器之间的第二电压跟随器的第四晶体管。
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公开(公告)号：US5485273A
公开(公告)日：1996-01-16
申请号：US690174
申请日：1991-04-22
CPC分类号： G01C19/66
摘要： Disclosed herein is a Ring Laser Gyroscope Enhanced Resolution System comprising, in a preferred embodiment, a sampling frequency modulation phase-locked loop (or "chirp") which is used in combination with the fast filter. Enhanced resolution is achieved by using the fast filter (preferably a moving average digital filter) to gather optically integrated rate data and accumulate this data. During the data gathering process, the accumulated data is sampled at a rate set by a frequency modulated ("chirper") phase-locked loop in order to remove undesirable data due to aliasing effects upon the digital filter. In this manner, an enhanced resolution of the gyroscope angular measurement is achieved.
摘要翻译： 本文公开了一种环形激光陀螺仪增强分辨率系统，其在优选实施例中包括与快速滤波器组合使用的采样频率调制锁相环（或“啁啾”）。 通过使用快速滤波器（优选移动平均数字滤波器）来收集光学积分的速率数据并累积该数据来实现增强的分辨率。 在数据采集过程中，以由频率调制（“啁啾”）锁相环设置的速率对累积数据进行采样，以便由于对数字滤波器的混叠效应而消除不期望的数据。 以这种方式，实现陀螺仪角度测量的增强分辨率。
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10.发明授权Apparatus and method for correcting ring laser gyroscope phase errors at turnaround 失效在周转时校正环形激光陀螺仪相位误差的装置和方法
公开(公告)号：US5004344A
公开(公告)日：1991-04-02
申请号：US405515
申请日：1989-09-11
IPC分类号： G01C19/66
CPC分类号： G01C19/662
摘要： Digitized heterodyne signals in a ring laser gyroscope are processed to determine the phase and acceleration of heterodyne signals at turnarounds in the angular motion of the frame of the ring laser. A hybrid analog/digital design that incorporates the necessary logic processes the turnaround data to produce a phase correction that can be added to the gyroscope count to correct phase errors that at each turnaround. Separation of high speed data processing from lower rate data simplifies the code and permits evaluation of turnaround correction performance. A fully digital system determines a phase distribution for the detected turnarounds and processes the phase distributions of the heterodyne signals for a multiplicity of turnarounds to determine an angle towards which the phase distributions are skewed and the amount of that skew. A phase correction is then calculated to compensate for turnaround-induced errors in measurements of phase differences between the two beams as a function of the skew angle and the amount of skew of the phase distribution.
摘要翻译： 处理环形激光陀螺仪中的数字外差信号被处理以确定环形激光器的框架的角运动中的外差信号的相位和加速度。 混合模拟/数字设计，包含必要的逻辑处理周转数据，以产生可以添加到陀螺仪的相位校正，以校正每次周转时的相位误差。 将高速数据处理与低速率数据分离简化了代码，并允许评估周转校正性能。 完全数字系统确定检测到的周转的相位分布，并处理多个转向的外差信号的相位分布，以确定相位分布偏斜的角度和该偏斜的量。 然后计算相位校正以补偿两个波束之间的相位差的测量中的周转引起的误差，作为相位分布的偏斜角和偏斜量的函数。
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