From: Dr Bruce Griffiths [EMAIL PROTECTED]
Subject: Re: [time-nuts] 5370B on eBay, carrier phase tracking GPS receiver
Date: Mon, 19 Feb 2007 17:41:52 +1300
Message-ID: [EMAIL PROTECTED]
Magnus Danielson wrote:
http://tycho.usno.navy.mil/ptti/ptti99/PTTI_1999_405.PDF
Hej Magnus
Magnus Danielson wrote:
An interesting product originating from Mitel (Mike and Terry's
lawnmowers later became MITEL - according to their local rep about 20
odd years ago)
Hehe... yeah, I know it was in the Mitel days they started this. I even
beleive
that the GPS
From: Dr Bruce Griffiths [EMAIL PROTECTED]
Subject: Re: [time-nuts] 5370B on eBay, carrier phase tracking GPS receiver
Date: Mon, 19 Feb 2007 23:39:47 +1300
Message-ID: [EMAIL PROTECTED]
Hej Magnus
Hej Bruce,
Fuller version is that the later Mitel founders worked for another
telecoms (Bell
Magnus Danielson wrote:
From: Dr Bruce Griffiths [EMAIL PROTECTED]
Subject: Re: [time-nuts] 5370B on eBay, carrier phase tracking GPS receiver
Date: Mon, 19 Feb 2007 23:39:47 +1300
Message-ID: [EMAIL PROTECTED]
Hej Magnus
Hej Bruce,
Fuller version is that the later Mitel
Dr Bruce Griffiths wrote:
Hej Magnus
Mitel actually used to make PABX equipment about 20 years ago. They also
did specialised ICs for such applications.
Bruce
That's what I knew them for, we even had a Mitel PABX for a while where
I work. Did not know they were into GPS and never seen
of precise time and frequency measurement
Subject: Re: [time-nuts] 5370B on eBay, carrier phase tracking GPS receiver
Dr Bruce Griffiths wrote:
Hej Magnus
Mitel actually used to make PABX equipment about 20 years ago. They
also did specialised ICs for such applications.
Bruce
That's what I
).
--
Björn
:-)
Rob K
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Didier Juges
Sent: 19 February 2007 12:42
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] 5370B on eBay, carrier phase tracking GPS
receiver
John,
One was sold by sierrametals (went for $250), the other by
electronicswest (went for $104)
I remember your posting but did not associate it with these items. I bid
on both, just in case since they were still at $20 an hour before close,
but I was not even close to final price, in either
Didier Juges wrote:
does not have an OCXO, I think.
I remember seeing a number of postings on time-nuts (must have been
Bruce) advocating the increased performance of carrier phase tracking,
but I need to educate myself about what it is and what good it can do
for me :-)
Any feedback
Didier Juges wrote:
On a different subject, I just won a Novatel Superstar 2 GPS receiver
advertised to do carrier phase tracking. It's specification lists a
timing accuracy of 50nS typical, which is not bad at all for a GPS that
does not have an OCXO, I think.
I remember seeing a number
Brooke Clarke wrote:
Hi Didier:
Many GPS receivers output carrier phase data but it's usually used in
post processing to get survey grade position accuracy. Since the code
phase position accuracy is larger than a wavelength the receiver does
not know how many integer wavelengths to add.
Brooke,
I read about the uncertainty of absolute position because the carrier
phase data has no absolute reference, but that still gives a very
precise relative position (and speed) information.
The point is that for timing, absolute position information is probably
unnecessary. The benefit
Hi Bruce:
Is there a paper describing the method?
Have Fun,
Brooke Clarke
Have Fun,
Brooke
w/Java http://www.PRC68.com
w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml
http://www.precisionclock.com
Dr Bruce Griffiths wrote:
Brooke Clarke wrote:
Hi Didier:
Many GPS
Brooke Clarke wrote:
Hi Bruce:
Is there a paper describing the method?
Have Fun,
Brooke Clarke
Have Fun,
Brooke
w/Java http://www.PRC68.com
w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml
http://www.precisionclock.com
Dr Bruce Griffiths wrote:
Brooke
Yes I
From: Dr Bruce Griffiths [EMAIL PROTECTED]
Subject: Re: [time-nuts] 5370B on eBay, carrier phase tracking GPS receiver
Date: Mon, 19 Feb 2007 16:53:55 +1300
Message-ID: [EMAIL PROTECTED]
Brooke Clarke wrote:
Hi Bruce:
Is there a paper describing the method?
Have Fun,
Brooke Clarke
Magnus Danielson wrote:
http://tycho.usno.navy.mil/ptti/ptti99/PTTI_1999_405.PDF
There is another paper just before it. There is also a patent for a
specific
form of implementation.
Note they used an Oncore VP, the Superstar has a better carrier phase
tracking.performance.
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