[IGSSTATION-4976] ALRT, HOLM & SACH antenna type errors in site log & RINEX files

[Michael Craymer]

Author: Mike Craymer

Site ID:   ALRT
DOMES No:  40162M001
Location:  Alert (Ellesmere Island), Nunavut, Canada

Site ID:   HOLM
DOMES No:  40148M001
Location:  Ulukhaktok, formerly Holman (Victoria Island), Northwest Territories, Canada

Site ID:   SACH
DOMES No:  40163M001
Location:  Sachs Harbour (Banks Island), Northwest Territories, Canada

Agency:    Natural Resources Canada (NRCan), Geodetic Survey Division

After the discovery of an incorrect antenna type in the site log and RINEX files for NAIN, we immediately inspected all of our other GPS sites. Unfortunately, we discovered that ALRT, HOLM and the decommissioned SACH also have incorrect antenna types. In all cases, the antenna type should be ASH701945D_M NONE, not ASH701945C_M NONE. All sites but HOLM have used only the one antenna (HOLM had an AOAD/M for the first two years). Note that SACH was in operation only from 2002-10-03 to 2005-10-16.

Although our local contact in ALRT has not yet inspected that antenna to definitively confirmed its type, its serial number (CR520020903) falls between that for NAIN (CR520020901) and HOLM (CR520020905). It is therefore certain that the ALRT antenna is also a ASH701945D_M. Nevertheless, I will post a confirmation of this once it is inspected.

Corrected sites logs for these sites have been submitted to Central Bureau and, starting today (Day 180), RINEX files will include the correct antenna type. We will also soon begin resubmitting corrected historic RINEX files. I will advise when all the files have been posted to the IGS archives. We apologize again for any problems these unfortunately errors have caused.

--
Mike Craymer, Ph.D.
Geodetic Survey Division, Natural Resources Canada
615 Booth Street, Ottawa, Ontario  K1A 0E9, Canada
Tel 613-947-1829, Fax 613-992-6628, Cell 613-791-0157
Email <mailto:craymer at nrcan.gc.ca>
Geodetic Survey Division <http://www.geod.nrcan.gc.ca/>
NAREF <http://www.naref.org/>