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Locus GPS rollover date appears to have come upon us
I have had two owners of Sokkia/Ashtech Locus GPS receivers contact me within the last 10 days or so saying that their receivers appear to be working perfectly in the field but when they bring the data from the receivers into the post processing software, the files show that they were collected in 1997.
I do not know exactly when this issue first manifest but correlating the Julian dates on the files from Locus receivers with the date problem and Promark2 receivers without the problem, it would appear that the GPS second counter reached its maximum capacity and reset around September 11, 2016.
if you have Locus receivers and have experienced this problem, I do not have a fix like the one posted on here for the older Trimble receivers. But there is a solution. If you have a Promark2 or Promark3 receiver, you can include one of those units in the sessions you are running with the Locus receivers. After you have downloaded the data from the Locus and the Promark units, duplicate one of the “e” files from the Promark, making as many copies as Locus files you have. Replace the “e” file for each Locus session with one of the copies you made, being careful to exactly duplicate the name of the file you are replacing. Then process as normal.
Should it be the case that you only have Locus receivers, you cause is not lost. Go on line to the NGS CORS download page and download CORS data for the day of your GPS occupations. Using the RINEX converter, make Ashtech format files from the CORS files. Then do the same operation as outlined above for replacing the “e” files for each Locus session with a copy of the “e” file from the CORS data.
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