[time-nuts] GPS receiver testing

k4cle at aol.com k4cle at aol.com
Thu Nov 1 00:31:05 UTC 2012


Magnus,
Most GPS simulators only have an OCXO in them which are not very good for  
making precision timing measurements.  The simulator needs to have a  
rubidium in it or have an external input for a more precision frequency  
source.

Regards,Doug

Connected by DROID on Verizon Wireless

-----Original message-----
From: Magnus Danielson <magnus at rubidium.dyndns.org>
To: time-nuts at febo.com
Sent: Thu, Nov 1, 2012 00:11:51 GMT+00:00
Subject: Re: [time-nuts] GPS receiver testing

John,

I would advice you to look at what Spirent and Pendulum can offer you 
with regards to GPS simulators. The Pendulum GPS simulation should be of 
interest as it is a fairly decent cost, where as the Spirent equipment 
is really really good. One way to characterize PPS properties is to do 
it against a GPS simulator, which would allow you to remove some 
uncertainties compared to live signal.

Said's pointers are indeed a good start, so I only wanted to give an 
extra dimension which you might need.

Cheers,
Magnus

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