Time scale computation system including complete and weighted ensemble definition
First Claim
1. A system for providing an ensemble time comprising:
- an ensemble of oscillators, each of said oscillators generating a respective oscillator signal;
first means for determining at least one of a time and frequency difference between oscillator signals for pairs of said oscillators; and
second means for providing an ensemble time based on the said at least one of a time and frequency difference and an ensemble time definition, wherein said ensemble time definition includes a time state of a one of said ensemble of oscillators with respect to said ensemble of oscillators that is a first average over said ensemble of oscillators of a time state term and further includes a frequency related state of said one of said ensemble of oscillators with respect to said ensemble of oscillators that is a second average over said ensemble of oscillators of a frequency related state term.
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Abstract
An improved system for providing ensemble time from an ensemble of oscillators is provided. In the system, a more complete ensemble definition permits a more accurate ensemble time to be calculated. The system takes into account at least weighted time and weighted frequency aspects or weighted time and weighted frequency aging aspects of each oscillator in the ensemble. Preferably, the system takes into account all of the weighted time aspects, weighted frequency aspect, and weighted frequency aging aspects for each oscillator in the ensemble. The weights with respect to each clock can be chosen to be either zero or any positive value such that the sum of the weights for each aspect sum to one. The system can be implemented using a Kalman approach.
51 Citations
25 Claims
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1. A system for providing an ensemble time comprising:
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an ensemble of oscillators, each of said oscillators generating a respective oscillator signal; first means for determining at least one of a time and frequency difference between oscillator signals for pairs of said oscillators; and second means for providing an ensemble time based on the said at least one of a time and frequency difference and an ensemble time definition, wherein said ensemble time definition includes a time state of a one of said ensemble of oscillators with respect to said ensemble of oscillators that is a first average over said ensemble of oscillators of a time state term and further includes a frequency related state of said one of said ensemble of oscillators with respect to said ensemble of oscillators that is a second average over said ensemble of oscillators of a frequency related state term. - View Dependent Claims (2, 3, 4, 5, 11)
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6. A system for providing an ensemble time comprising:
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an ensemble of oscillators, each of said oscillators generating a respective oscillator signal; first means for determining frequency differences between oscillator signals for pairs of said oscillators; and second means for providing an ensemble time based on the frequency differences and an ensemble time definition, wherein said ensemble time definition includes a time state of a one of said ensemble of oscillators with respect to said ensemble of oscillators that is a first average over said ensemble of oscillators of a time state term, a frequency state of said one of said ensemble of oscillators with respect to said ensemble of oscillators that is a second average over said ensemble of oscillators of a frequency state term, and a frequency aging state of said one of said ensemble of oscillators with respect to said ensemble of oscillators that is a third average over said ensemble of oscillators of a frequency aging state term. - View Dependent Claims (7, 8, 9, 10)
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12. A system for providing an estimate of the ensemble time of an ensemble of clocks, comprising:
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an ensemble of clocks, each of said ensemble of clocks providing a clock signal that has a parameter which is capable of being measured with respect to another of said ensemble of clocks; first means for measuring a difference between said parameter for a pair of said ensemble of clocks, wherein one of said pair of ensemble of clocks is a reference clock; and second means for using said difference and an ensemble time definition to provide an estimate of the ensemble time for said ensemble of clocks, wherein said ensemble time definition includes an average over said ensemble of clocks of a clock state term that includes a forecast clock state vector, wherein said forecast clock state vector is other than an estimated forecast clock state vector. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification