[AR] Re: GPS again....

  • From: Paul Breed <paul@xxxxxxxxxx>
  • To: arocket@xxxxxxxxxxxxx
  • Date: Thu, 24 Dec 2015 07:24:36 -0800

Nathan,
Can you charactorize the data loss in your GPS data?

IE we got X sec of good data then a gap of X etc.....

The FastGps software receiver has a no data snamp_data mode where it
decodes position based on just the code phase measurements and should work
with
very short valid GPS data streams...

I have this running and if you can get me a GPS data file and description
of the format its in I'll see what I can get?


Paul






On Tue, Aug 4, 2015 at 10:35 PM, Nathan Bergey <nathan.bergey@xxxxxxxxx>
wrote:

The first thing I did (after poking around to find that JGPS is the tag
for the raw GPS data) is to extract the time stamps on all of
those packets and plot the differences [...]

Nice work! Unfortunately this is what we're seeing as well :(

After out meeting tonight it sounds like we really did loose the data
in the gaps. At least we should be able to reproduce it now on the
ground and figure out why. Unfortunately we're not going to be able to
fly another rocket this year (money, time, resources, the usual.)

There are several segments where we do have good looking GPS data to play
with!


Here is our github issue tracking the data loss problem for anyone who
wants to follow along:

https://github.com/psas/Launch-12/issues/77



-Nathan
PSAS


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