FLOSSII: Logbook Entries

FLOSSII: GPS Messages: 2 Entries..

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Entry Date Title Site Author #Graphics
178 Fri 28-Feb-2003GPS testingsageoncley
175 Thu 27-Feb-2003Intermittent GPS outages at sagesageoncley


178: GPS, Site sage, Fri 28-Feb-2003 09:31:18 MST, GPS testing
At John's advice, I'm logging the GPS signal using EVE-talk.  Thus, data from 
sage already has had one outage and I will make another outage now.  (Since
I note that the GPS always goes bad at 39 minutes past the hour.) 
175: GPS, Site sage, Thu 27-Feb-2003 16:20:12 MST, Intermittent GPS outages at sage
Today we've had several "Lost Data" messages from the GPS at sage.  A plot of
the raw data indicate that we lost at least one sample from this sensor every
hour, and John's config is only reporting a sample every minute.  (In contrast,
lake's GPS has only lost one sample in the last 8 hours.)

John speculates that this GPS is having problems locking onto the satellites,
is reporting that its data may be bad, and EVE is rejecting these messages.

I just went to sage for an inspection of the GPS.   All looked okay, but I
cycled power on the GPS and rotated the antenna 90 degrees, so that the walk
there wasn't wasted.  We'll have to see what happens.

(John has suggested using EVE_talk to this sensor to look for "A" or "Z?" as
the first character, but I think this would be hard for such an intermittent
problem.)