[time-nuts] GPS fadeout
hmurray at megapathdsl.net
Tue Aug 21 19:26:06 EDT 2007
I'm trying to check/debug some new software so I'm paying attention to the
output of a Garmin GPS 18 USB.
It's inside my house, not a great location. Mostly, it works. But every now
and then it fades out for a few minutes.
I'm only logging the data every minute or so, but I have counts of the
good/bad seconds. On the glitch that just happened, it was going fine with 5
satellites. Then it faded out to 0 satellites. Two minutes later it had 5
satellites again. The total even was under 4 minutes.
Are glitches like that common? Does anybody have a list of what causes them?
The only thing I can think of is multipath off an airplane. Big jets are not
uncommon overhead. I'm ~30 miles south of SFO.
These are my opinions, not necessarily my employer's. I hate spam.
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