Holdover in synchronization applications: Difference between revisions

Revision as of 15:02, 12 September 2011

Revision as of 15:05, 12 September 2011

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==Holdover Performance Aspects==

Two independent clocks once synchronized will walk away from one another without limit. How fast this happens depends on the quality of the oscillator <ref>http://tf.nist.gov/general/pdf/988.pdf</ref>

Holdover relies on the OCXO, the PLL design, and correction mechanisms<ref>http://www.analog.com/static/imported-files/application_notes/AN-1002.pdf</ref>

Aging and temp stability are taken to be the dominant factors. During Holdover the maximum error due to the OCXO is limited by control mechanisms. <ref>http://kunz-pc.sce.carleton.ca/thesis/CrystalOscillators.pdf</ref>

Algorithms and quartz get good results<ref>http://tf.nist.gov/general/pdf/2297.pdf</ref>

During Holdover the maximum error due to the OCXO is limited by control mechanisms

Time[[Allan Deviationvariance]] can measure instabilities

Algorithms and quartz get good results

Allan[[Time Variancefeviation]] can measure instabilities

==Implementing Holdover Solutions==

Time Deviation can measure instabilities

Implementing Holdover Solutions

GPS Clocks are used