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    • 1. 发明申请
    • ADAPTIVE MULTI-AXIS SENSOR ARRAY
    • 自适应多轴传感器阵列
    • US20080319707A1
    • 2008-12-25
    • US11821852
    • 2007-06-25
    • David W. AllanJohn A KustersGus R. German
    • David W. AllanJohn A KustersGus R. German
    • G01C21/00
    • G01C21/165
    • A sensor array made up of 2 n piezoelectric oscillators (preferably paired quartz oscillators) is provided in which n equals the number of axes of interest and each one of the pairs of oscillators has a principle axis directed oppositely from the other of its pair. A controller which preferably includes a microprocessor, makes use of the dynamic relationships of the sensors in the array to adaptively assess the magnitude of weighting factors needed to correct the output signal from each oscillator for environmental and systematic effects to provide optimum frequency and phase output for computing position, velocity, and acceleration. Preferably, a seventh reference oscillator is provided in the center of the array which is canted relative to each of the three orthogonal axes by 45°. This adaptive sensor array is capable of determining position within one meter along any of the x, y, and z axes without the need for any external (e.g., GPS) signal. In addition, unlike other sensor systems, it is capable of providing local vertical on a continuous basis. The array can also determine if an object is moving in any translational or rotational direction, within the measurement capabilities of the system.
    • 提供由2n个压电振荡器(优选成对的石英振荡器)组成的传感器阵列,其中n等于感兴趣的轴数,并且每对振荡器中的每一个具有与其对中的另一个相反的主轴。 优选地包括微处理器的控制器利用阵列中的传感器的动态关系来自适应地评估校正来自每个振荡器的输出信号所需的加权因子的大小,从而为环境和系统效应提供最佳的频率和相位输出 计算位置,速度和加速度。 优选地,第七参考振荡器设置在阵列的中心,其相对于三个正交轴中的每一个倾斜45°。 该自适应传感器阵列能够沿着任何x,y和z轴确定一米内的位置,而不需要任何外部(例如,GPS)信号。 此外,与其他传感器系统不同,它能够连续提供局部垂直。 该阵列还可以在系统的测量能力内确定物体是否以任何平移或旋转方向移动。
    • 2. 发明授权
    • Device and method for providing accurate time and/or frequency
    • 提供精确时间和/或频率的装置和方法
    • US5274545A
    • 1993-12-28
    • US864167
    • 1992-04-03
    • David W. AllanJudah LevineDicky D. DavisMarc A. Weiss
    • David W. AllanJudah LevineDicky D. DavisMarc A. Weiss
    • G04G3/00G04G7/02G04G21/04G06F1/12G06F1/14G04G5/00
    • G04G7/026G04G21/04G06F1/12G06F1/14
    • A device and method provide for an accurate output from a unit, such as an oscillator and/or clock providing an output indicative of frequency and/or time. The device includes a processing section having a microprocessor that develops a model characterizing the performance of the device, including establishing predicted accuracy variations, and the model is then used to correct the unit output. An external reference is used to provide a reference input for updating the model, including updating of predicted variations of the unit, by comparison of the reference input with the unit output. The ability of the model to accurately predict the performance of the unit improves as additional updates are carried out, and this allows the interval between the updates to be lengthened and/or the overall accuracy of the device to be improved. The accuracy of the output is thus adaptively optimized in the presence of systematic and random variations.
    • 设备和方法提供来自单元的准确输出,例如提供表示频率和/或时间的输出的振荡器和/或时钟。 该装置包括具有微处理器的处理部分,该微处理器开发表征装置的性能的模型,包括建立预测的精度变化,然后使用该模型来校正单位输出。 通过比较参考输入和单位输出,外部参考用于提供用于更新模型的参考输入,包括更新单元的预测变化。 随着执行额外的更新,模型准确预测单元性能的能力得到改善,这样可以使更新之间的间隔延长和/或改进设备的整体精度。 因此,在存在系统和随机变化的情况下,输出的精度被自适应地优化。
    • 3. 发明授权
    • Microwave power level stabilizing circuit for cesium beam frequency
standards
    • 微波功率电平稳定电路用于铯束频率标准
    • US4331933A
    • 1982-05-25
    • US161185
    • 1980-06-19
    • David W. AllanR. Michael Garvey
    • David W. AllanR. Michael Garvey
    • H03L7/26
    • H03L7/26
    • Perceived atomic resonance frequency error resulting from microwave power level changes in atomic clocks is eliminated by controlling the device's microwave power source output in response to deviations from a fixed frequency relationship between the main atomic peak and a sidelobe peak of the atomic beam frequency spectrum. This is accomplished by a microwave power control servo system that includes a time sharing interrogation circuit for detecting and monitoring the frequencies of the main atomic peak and the sidelobe peak and a comparator that compares the frequencies of the main atomic and sidelobe peaks and generates a feedback control signal in response to frequency differences between the two that deviate from a fixed difference frequency. The feedback signal is used to control the microwave power source output in a manner that constrains the main atomic peak and the sidelobe peak at a fixed offset frequency.
    • 通过响应于主原子峰和原子束频谱的旁瓣峰之间的固定频率关系的偏差来控制器件的微波功率源输出,消除了原子钟中的微波功率电平变化导致的感知原子共振频率误差。 这通过微波功率控制伺服系统实现,该系统包括用于检测和监测主原子峰值和旁瓣峰值的频率的时间共享询问电路和比较器,其比较主原子和旁瓣峰值的频率,并产生反馈 响应于两者之间的频率差异偏离固定差分频率的控制信号。 反馈信号用于以限制主原子峰值和旁瓣峰值固定偏移频率的方式来控制微波功率源输出。
    • 5. 发明授权
    • Adaptive multi-axis sensor array
    • 自适应多轴传感器阵列
    • US07472032B1
    • 2008-12-30
    • US11821852
    • 2007-06-25
    • David W AllanJohn A KustersGus R German
    • David W AllanJohn A KustersGus R German
    • G01C21/00
    • G01C21/165
    • A sensor array made up of 2n piezoelectric oscillators (preferably paired quartz oscillators) is provided in which n equals the number of axes of interest and each one of the pairs of oscillators has a principle axis directed oppositely from the other of its pair. A controller which preferably includes a microprocessor, makes use of the dynamic relationships of the sensors in the array to adaptively assess the magnitude of weighting factors needed to correct the output signal from each oscillator for environmental and systematic effects to provide optimum frequency and phase output for computing position, velocity, and acceleration. Preferably, a seventh reference oscillator is provided in the center of the array which is canted relative to each of the three orthogonal axes by 45°. This adaptive sensor array is capable of determining position within one meter along any of the x, y, and z axes without the need for any external (e.g., GPS) signal. In addition, unlike other sensor systems, it is capable of providing local vertical on a continuous basis. The array can also determine if an object is moving in any translational or rotational direction, within the measurement capabilities of the system.
    • 提供由2n个压电振荡器(优选成对的石英振荡器)组成的传感器阵列,其中n等于感兴趣的轴的数量,并且每对振荡器中的每一个具有与其对中的另一个相反的主轴。 优选地包括微处理器的控制器利用阵列中的传感器的动态关系来自适应地评估校正来自每个振荡器的输出信号所需的加权因子的大小,从而为环境和系统效应提供最佳的频率和相位输出 计算位置,速度和加速度。 优选地,第七参考振荡器设置在阵列的中心,其相对于三个正交轴中的每一个倾斜45°。 该自适应传感器阵列能够沿着任何x,y和z轴确定一米内的位置,而不需要任何外部(例如,GPS)信号。 此外,与其他传感器系统不同,它能够连续提供局部垂直。 该阵列还可以在系统的测量能力内确定物体是否以任何平移或旋转方向移动。