Precision Clock Evaluation Facility

Metadata Updated: March 8, 2017

FUNCTION: Tests and evaluates high-precision atomic clocks for spacecraft, ground, and mobile applications. Supports performance evaluation, environmental testing, including shock and vibration, and anomaly investigation of on-orbit observed performance.DESCRIPTION: The Precision Clock Evaluation Facility (PCEF) consists of time and frequency reference standards for comparison with test units that are made up of five active hydrogen maser frequency standards, three of which are housed in a large environmental chamber for humidity and temperature control. These references provide uninterrupted precise and accurate time/frequency with a stability of about 1 [HTML_REMOVED] 10 -1 5 at 1 day.Theyare maintained in synchronism with coordinated universal time (UTC) as maintained at the United States Naval Observatory (USNO), called UTC(USNO), by several independent means. Eight spacecraft cesium and rubidium atomic clock sized thermal vacuum chambers specially designed for short- and long-term testing are used to simulate a spacelike environment (less than 1 [HTML_REMOVED] 10 -6 torr) with temperature conrol of 0.1 [HTML_REMOVED]C.To support long-term testing in a space environment, the test chambers and time/frequency standard references are operated on a 125 kW uninterruptible power system with diesel backup. Magnetic sensitivity testing of precision frequency standards is performed with two Helmholtz coil systems: a three-axis multicoil system and a single-axis 1.5-m Helmholtz coil.INSTRUMENTATION: Four NRL-built data collection systems are used within the PCEF. The primary atomic clock measurement/data collection system is a 48-channel, dual-mixer phase measurement system capable of simultaneous measurements of 48 different clocks at 20-s intervals indefinitely. A single-channel, dual-mixer phase measurement system used for special evaluations is capable of measurements as short as 0.01 s. These data systems each have 2 ps of resolution. Software used in these systems was designed and coded by NRL, and includes analysis software with graphics and networking support for commercial products.

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Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Metadata Created Date March 8, 2017
Metadata Updated Date March 8, 2017

Metadata Source

Harvested from Federal Laboratory Consortium Data.json

Additional Metadata

Resource Type Dataset
Metadata Created Date March 8, 2017
Metadata Updated Date March 8, 2017
Publisher Federal Laboratory Consortium
Unique Identifier 6B543C69-2DDE-4603-A8ED-AAF87EDB8472
Maintainer Email
Public Access Level public
Address1 4555 Overlook Avenue S.W.
Metadata Context
Schema Version
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Harvest Source Id 5859cfed-553c-48de-a478-b67b5225f6fc
Harvest Source Title Federal Laboratory Consortium Data.json
Phone 202-767-3083
Postalcode 20375
Repphone (202) 767-5111
Sizesqft 0
Source Datajson Identifier True
Source Hash 2e16c99e8eb89d79f20e48d4ba0755e33e693e07
Source Schema Version 1.1
Statecode DC

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