The use of multi-variance for likelihood weighted drift estimation in a disciplined oscillator algorithm

Weaver, Gregory; Miranian, Mihran; Garstecki, Jeffrey F.

doi:10.1109/fcs.2011.5977876

Cited by 1 publication

(4 citation statements)

References 8 publications

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“…8 presents an image of the simulated disciplined system (in red) against the actual in-situ CSAC minus USO (in green) and CSAC minus maser (in blue). The most apparent aspect in the propagated USO data are the small frequency anomalies at day 3 and day 17 caused by gaps introduced into the data collection, a further demonstration of the algorithm described in [6].…”

Section: Figure 6 -Example Of Uso Frequency Perturbation As Distinguimentioning

confidence: 97%

“…2, errors to timekeeping accuracy found in [6] were mostly involved with the incidence of frequency perturbations in the USO. These USO frequency perturbations were attributed to inadvertent changes to thermal vacuum condition, which was intended to remain constant over the 72 day test period.…”

Section: Figure 1 -Notional System Block Diagram Of Jhu/apl Disciplinmentioning

confidence: 98%

“…1 describes a notional system block diagram of our disciplined USO timekeeping system (TKS). The three key technologies described in [6] are indicated within the red dashed area of Fig. 1.…”

Section: Jhu/apl Research Into Disciplined Uso Timekeepingmentioning

confidence: 99%

“…Our JHU/APL funded research, discussed in [6], focuses on advancing algorithms and software control developments for a disciplined USO based clock system. Our research into USO-based timekeeping shows that incorporating an in-situ control system for removing USO deterministic frequency drift and error bias, based on a multi-variance method with a Bayesian maximum likelihood estimator (MLE) process, should mitigate post-processing dependency and enhance local navigation autonomy.…”

Section: Jhu/apl Research Into Disciplined Uso Timekeepingmentioning

confidence: 99%

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Composite USO/CSAC timekeeping system

Weaver

Miranian

Garstecki

2012

2012 IEEE Aerospace Conference

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The recent introduction of a first generation of chip scale atomic clocks (CSAC) offers an opportunity to enhance space-based communication and navigation systems with their unique aspects of frequency accuracy and very low size, weight and power. Nonetheless, CSAC frequency noise levels are likely too high to be used directly as master frequency sources in deep space communication systems.Composite clock systems combine complementary frequency sources to utilize the best accuracy and stability of each source to extend the overall performance of the clock system. We will discuss our research work toward a composite ultra-stable oscillator (USO)/CSAC timekeeping system. Such a system would preserve the low noise and excellent short term stability of the quartz USO while using the CSAC technology as an augmentation for clock drift correction and monitoring for insitu frequency disturbance during autonomous operation.

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Section: Figure 6 -Example Of Uso Frequency Perturbation As Distinguimentioning

confidence: 97%

Section: Figure 1 -Notional System Block Diagram Of Jhu/apl Disciplinmentioning

confidence: 98%

Section: Jhu/apl Research Into Disciplined Uso Timekeepingmentioning

confidence: 99%

Section: Jhu/apl Research Into Disciplined Uso Timekeepingmentioning

confidence: 99%

See 2 more Smart Citations