Hi,
if I remember my statistics correctly:
1-Sigma is the standard deviation of all measurements. 6-Sigma is something
like 99.997%(?) of all measurements, basically all relevant measurements.
Keep in mind that the Motorola GPS need to be initialized by a binary
string, they will not
In message [EMAIL PROTECTED], [EMAIL PROTECTED] writes:
Also, the Motorola parts have one drawback: they need a Lithium battery (or
similar) to keep the most recent Almanac. I have found that the TTFF (first
fix) can take quite long if the battery is weak (2V) and the RTC stops due
to
You
[EMAIL PROTECTED] wrote:
The Clock Granularity message is to be applied to the next following 1PPS
pulse in Motorola speak. Typically, the 1PPS is captured by a
Microcontroller,
which can then add the granularity message data to the capture time, and thus
improve the measurement
You can find M12+ sawtooth information and plots at:
http://www.leapsecond.com/pages/m12/sawtooth.htm
Also, here is a nice graph comparing the 1 PPS error
of 4 GPS receivers:
http://www.leapsecond.com/pages/gps4/cns-1pps.gif
Dark blue is a Motorola Oncore VP with approximately
+/- 50 ns of
Hi:
I'm not sure if Trimble does it on the Resolution T, but on the Trimpack
GPS receivers,
http://www.pacificsites.com/~brooke/Trimpack.shtml#BUB
have a Lithium battery soldered to one of the PCBs and a Dallas chip
that turns all the RAM into non volatile memory (just like core memory
in
From the leapsecond.com website, it seems the Trimble gets 2.15E-011 at
1000s intervalls.
The M12+ achieves 2.9E-012 at 1000s intervalls.
The M12+ is speced at 10ns 1-Sigma, the Trimble seems to be 15ns at 1-Sigma.
There is an M12+ follow-up modell comming soon which is even better
Well, thanks for the advice!
...And also one other convincing (at least for me)
feature:
The M12+ has a choice of either a 1PPS precise signal
or a 100PPS precise signal. For my application (GPS
disciplined frequency standard), the 100PPS option
will surely help settle the frequency for the few
In message: [EMAIL PROTECTED]
Normand Martel [EMAIL PROTECTED] writes:
: What's that clock granularity message?
The M12+ reports the error in the PPS position. If you make your
measurement, then add in its estimated error, you can get that level
of precision. I'm not sure how you
and frequency measurement
Betreff: Re: [time-nuts] ...Your thoughts on the Trimble Resolution T?
Well, thanks for the advice!
...And also one other convincing (at least for me)
feature:
The M12+ has a choice of either a 1PPS precise signal
or a 100PPS precise signal. For my application (GPS
In message [EMAIL PROTECTED], Normand Martel
writes:
Performance using clock granularity message:
Better than 2ns, 1 sigma
Better than 6ns, 6 sigma
Performance NOT using clock granularity message:
Better than 10ns, 1 sigma
Better than 20ns, 6 sigma
What's that clock granularity
Hi...
I seriously think about buying a Trimble Resolution T
timing GPS receiver for a GPS disciplined OCXO
frequency standard (Brooks Shera W5OJM's project).
Have someone worked with this receiver? The claimed
maximum 1PPS to UTC error is 15ns, the best figure i
saw yet on GPS
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