teqc should Take Care of Recent Ashtech Date Problems

Following is the lastest UNAVCO email regarding the Ashtech Locus, Z-12 and Z Surveyor date problem.
I have not tried it with teqc since I use WIN teqc. I do not see the -week option in WIN teqc, but WIN teqc redated the files anyway, but to one week late. The files I used were redated to 2016 12 05, one week after their 2016 11 28 collection date, If you have and use teqc, give it a try.

I had contacted Lou Estey last week regarding the Ashtech Locus.

I have edited the dates on two of three files to work, the third is a no go which may be a problem beyond the date.

Paul in PA

Hi Lou,

Thank you very much! Very helpful.

Best Regards, Joe Sass

On Wed, Dec 7, 2016 at 8:04 AM, Lou Estey wrote:
On 07-Dec-16 06:59 AM, Joe Sass wrote:
Hello Lou,

A few weeks ago, many of our old receivers (Z-Surveyor and LOCUS for example) started collecting raw data with bad time stamps and
unprocessable data. In reading some of the threads and speaking with colleagues, your name was mentioned as possibly understanding what
changes have taken place or what cusp has been crossed to cause these failures.

Do you have any ideas about this? I am more curious than worried. Most of the receivers in question have outlived their discontinuance by
more than a decade.

Thank you in advance for your insights.

--

Best Regards,

Joe Sass
Channel Development Manager, Geospatial
935 Stewart Drive | Sunnyvale, CA 94085
[email protected]

hi Joe,

Here's what I know:

I first heard about week problems with the Ashtech Locus last week when a user reported
that a set of them were recording the date to be the week of 13 Apr 1997.

Last week was GPS week 1925 and 1925 - 1024 = 901, which was the week of 13 Apr 1997.

This situation is very much like the same thing the happened to two other sets of receivers
this year; the problems with those receivers (below) started on Sunday right after the
end-of-week rollover.

The first was when Trimble 4700s (and maybe a few of older Trimble models?) started
recording the week wrong by -1024 weeks starting on 14 Feb 2016.

The second was when Ashtech Z-12s and variants started reporting the week wrong by -1024 weeks
starting on 6 Nov 2016. (see http://postal.unavco.org/pipermail/teqc/2016/002185.html )

Now you've included the Z-surveyor (which I believe is related to the Z-12, at least
roughly the same vintage).

The commonality is that these are all older receivers with, essentially, unsupported firmware.

I've been told by teqc users (engineers here at UNAVCO and other users) that at least
with raw data from the Trimble 4700s and the Ashtech Z-12s that if you use the '-week' option
with the correct GPS week to read the raw data, using a week value for when the data are
actually for (but not based on the file name or what teqc reports using '+mds' or '+meta'
on the raw data from the receiver), then teqc will correctly translate the raw data into RINEX.

Hope this helps.

cheers,
--lou

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Louis H. Estey, Ph.D. office: [+001] https://surveyorconnect.com/community/tel:303-381-7456&apos ;">303-381-7456
UNAVCO, 6350 Nautilus Drive FAX: [+001] https://surveyorconnect.com/community/tel:303-381-7451&apos ;">303-381-7451
Boulder, CO 80301-5554 e-mail: lou http://unavco.org/&apos ;">unavco.org
WWW: http://www.unavco.org/&apos ;"> http://www.unavco.org http://jules.unavco.org/&apos ;"> http://jules.unavco.org

"If the universe is the answer, what is the question?"
-- Leon Lederman
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

--

Best Regards,

Joe Sass
Channel Development Manager, Geospatial
935 Stewart Drive | Sunnyvale, CA 94085
[email protected]

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