[Acoustics] GPS Rant

[Marinna A Martini]

Hi all,

I'll add downloading of instrument data to the rant.

Jon has long had trouble downloading data under winXP, best we can figure, 
the OS is sort of ADD, and goes off to do something else for a bit, then 
pays attention to the port again.

What results is lost records from a time series on an instrument we know 
is functioning well.  Repeat the download several times and get different 
lost records.  Seabird said to use a particular type of USB adapter, but I 
don't think that fixed the problem (Jon correct me if I got this wrong).

Cheers,
Marinna

-------- "Be seeing you..."  - The Prisoner ----------------------------
Marinna Martini,  Electronics/Ocean Engineer
USGS Woods Hole Science Center, MA
mmartini at usgs.gov, (508) 457-2326, FAX (508) 457-2313




"Thomas O'Brien" <tobrien at usgs.gov> 
Sent by: acoustics-bounces at simon.er.usgs.gov
04/05/2006 02:05 PM

To
<acoustics at simon.er.usgs.gov>
cc

Subject
[Acoustics] GPS Rant






Good Day, WinRiver may not be the culprit. We are experiencing similar
issues with our swath bathymetry system. There seems to be an 
unpredictable
latency with serial ports, in this case, with Windows XP and our 
bathymetric
data collection software.

The folks at Hypack talk about timing problems with GPS at this link.
http://www.hypack.com/support_articles/TrainingNotes2005.htm

I cannot seem to locate it again, but I have seen a document at the Hypack
site that discourages the use of USB to serial converters, again for 
latency
issues.

We are going to try and nail down the timing issues we are having within 
the
next several weeks. We are also going to evaluate a serial to Ethernet
converter, hopefully that will improve time and GPS stamping of our
bathymetry.

Best regards, Tom


-- 
Thomas F. O'Brien
US Geological Survey
384 Woods Hole Road
Quissett Campus
Woods Hole, MA 02543-1598

Web:    woodshole.er.usgs.gov/operations/sfmapping
Phone:  508.457.2246
FAX:    508.457.2310
Cell:   508.922.6650


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