[time-nuts] Time Interval Averaging: Theory, Problems, and Solutions

Dr Bruce Griffiths bruce.griffiths at xtra.co.nz
Thu Dec 21 16:57:40 EST 2006


Brooke Clarke wrote:
> Hi Bruce:
>
> How to get a copy?
>
> Have Fun,
>
> Brooke Clarke
>
> w/Java http://www.PRC68.com
> w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml
> http://www.precisionclock.com
>
>   
>> /Time Interval Averaging: Theory, Problems, and Solutions/, David Chu, 
>> HP Journal June 1974 pp12-15.
>>
>>
>> Bruce
>>  
>>
>>     
>
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>   
Brooke

Try:
http://www.hparchive.com/Journals/Low-Resolution/HPJ-1974-06-Low-Resolution.pdf
or if you prefer higher resolution:
http://www.hparchive.com/Journals/HPJ-1974-06.pdf

Article is about improving the accuracy and resolution of time interval 
measurement by averaging, which is exactly what the Brooks Shera phase 
detector  purports to do.
Other higher resolution phase detectors will have the same problems 
unless there is sufficient gaussian noise present.
The hanging bridges etc are one manifestation of the effects detailed in 
the article.
However even with clean non quantised PPS signal positioning the time 
interval counter will itself produce similar artifacts if there isn't 
enough noise.

The higher the resolution of the TIC used, the less noise that is 
required to destroy the coherence.

Bruce


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