GPS is less than 100 gm and would fit in 75mm.
RF recording setup is 3x that and could fit in 75mm with enough length
(20mm)
On Tue, Jul 21, 2015 at 5:58 PM, Lars Osborne <lars.osborne@xxxxxxxxx>
wrote:
I second George. Well done Paul.
How much mass is your GPS payload and what diameter does it fit into?
Thanks,
Lars Osborne
On Sun, Jul 19, 2015 at 1:21 AM, George Herbert <george.herbert@xxxxxxxxx>
wrote:
You are obviously way ahead of me, Paul. Go gettem.
George William Herbert
Sent from my iPhone
On Jul 18, 2015, at 8:30 PM, Paul Breed <paul@xxxxxxxxxx> wrote:
The Piksi can record raw GPS front end RF with the right setup.
I hope to fly that setup in 2 weeks.
I may also replace the TCXO with a 'g' tolerant oscillator.
I used the swift nav tiny GPS hockey puck antenna, I have better, but
that is what I flew.
I turned the tracking loop parameters wider, and I may have overdone it.
One of the gentleman at Swift likes my project and has been spending time
helping me personally.
PIKSI is clearly still a work in progress but its getting better every
day...
I was not trying to use it in RTK mode, I was using it because Its open
source and
I can get to the GPS internals and bend it to my will....
I will keep flying and adjusting till I have a robust high acceleration
GPS unit....
Paul
On Sat, Jul 18, 2015 at 6:58 PM, George Herbert <george.herbert@xxxxxxxxx
wrote:
Hmm. Wonder if someone could signal capture the analog signal off one
of these under launch-like Gs and see if it was signal quality or
processing electronics or too fast for tge digital side.
George William Herbert
Sent from my iPhone
On Jul 18, 2015, at 3:48 PM, Ken Biba <kenbiba@xxxxxx> wrote:rather than RX sensitivity limited.
The good news. Regained lock at apogee.
Likely still needs receiver sensitivity improvements so ITAR limited
the chance of maintaining lock.
What antenna did you use Paul?
Might still be usable for altitude records exceeding uBlox limits.
K
Ken Biba
Novarum, Inc.
415-577-5496
On Jul 18, 2015, at 3:01 PM, Paul Breed <paul@xxxxxxxxxx> wrote:
Ok I flew an HPR with a PIksi...
I used the latest S/W from Swift with the dynamics turned to maximize
knots) when drogue deployed.
It did not maintain lock.
Lost lock on ignition, regained lock at apogee....
It was really windy so we had a lot of horizontal velocity (204
Shredded the electronics bay and thus landed hard with no main deploy.
Fortunately other than a shredded electronics bay rocket seems ok...
I've got more experiments in the series planned I'll keep you posted..
Paul
