[time-nuts] TRAIM Action
Randy at synergy-gps.com
Fri Aug 11 14:56:43 EDT 2006
While there may be some variations in how manufacturers code their TRAIM
algorithms, I have attached an OLD (1998!) Motorola Doc concerning their
TRAIM. Basically, you can tell the receiver how to handle TRAIM errors.
You can tell the receiver to keep outputting the 1PPS and flag it as
suspect, turn it off until the TRAIM alarm condition is rectified, etc.
You guys using the old 8 channel VP and UT+ receivers use the @@En
message to control this. On newer receivers such as the M12+, control is
broken down into three separate messages (@@Gc, @@Gd, and @@Ge).
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Brooke Clarke
Sent: Friday, August 11, 2006 11:30 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] SiLabs
Would you elaborate on how TRAIM works. I thought that it acted like a
switch and either allowed the 1 PPS output or turned it off.
But you seem to be saying that it can remove a bad satellite from the
solution and maintain the 1 PPS output. Is that the case?
w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml
Randy Warner wrote:
>You're right. I would expect quite a bit of jitter. My comment about
>USB-Serial converters probably should not be on a "timing" news list.
>However, the 1PPS coming in on the DCD line of a standard serial port
>jitters too, but is still plenty accurate for "loose" timing systems
>like NTP servers who are only looking for millisecond type resolution.
>I think one of the main reasons we still sell a lot of timing receivers
>to these customers is really because of the TRAIM function. They really
>don't need ns type accuracy, but they DO want the receiver to alert
>to large anomalies due to sick satellites, and to automatically remove
>the satellites from the solution.
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