FYI, COSMIC also measures precipitable water vapor via GPS ground stations too.
It's called Souminet:
http://www.suominet.ucar.edu/
-JCN
Message: 2
Date: Fri, 10 Oct 2014 06:17:13 -0700
From: Jim Lux jim...@earthlink.net
To: time-nuts@febo.com
Subject: Re: [time-nuts] Sun Outage
Message-ID:
If there are already other GPS units onboard,
also be careful of interference. On some of our
balloon work we have had COTS GPS receivers that
would jam each other if placed to closely together.
It'd be a shame if your $50 cheapie jammed the
space-rated unit and sank the whole mission.
I'm looking for a way to take GPS time and generate a signal that can be
recorded on the audio track of a video recording to time stamp it. This is so
it can be aligned with other data that's collected with GPS based time. It
needs to be portable/small (i.e. Something you could attach
