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Re: [gpsd-users] Missing fixes
From: |
Gary E. Miller |
Subject: |
Re: [gpsd-users] Missing fixes |
Date: |
Tue, 20 Feb 2018 12:30:06 -0800 |
Yo Deven!
On Tue, 20 Feb 2018 12:09:28 -0800
Deven Hickingbotham <address@hidden> wrote:
> I'll send the raw data directly to you. 10hz and 4hz.
Please, list only. I'm not the only one here, there are a lot of interested
lukers.
> I tested at 4hz and there were no missing fixes.
As expected.
Do the math. 115200 is about 10k chars a second. At 10 Hz that
is 1k chars each cycle. But the GSVs alone can be more than 1k! So
one GSV group and you already lost the game.
> Maybe I could further optimize the message stream from the GPS?
Maybe. And/or up the rate to 230400.
> If I just needed time, lon/lat, speed & track, could I just enable
> the RMC sentence and turn everything else off?
You could try it. Might be enough.
> If I wanted to add altitude, looks like I would have to add the GGA
> sentence.
Or, better to go u-blox binary.
> And in order to get epx and epy, would I have to add both GSA & GSV?
Or, better to go u-blox binary.
And do you really need 10Hz? What can possibly happen at 10Hz? Even
the msall mass of a small drone can't change direction, much, at that
rate.
Most autopilots are averaging to remove the jitter, not trying to add
more jitter.
RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
address@hidden Tel:+1 541 382 8588
Veritas liberabit vos. -- Quid est veritas?
"If you can’t measure it, you can’t improve it." - Lord Kelvin
pgpz2hR4ardBL.pgp
Description: OpenPGP digital signature
- [gpsd-users] Missing fixes, Deven Hickingbotham, 2018/02/19
- Re: [gpsd-users] Missing fixes, Gary E. Miller, 2018/02/19
- Message not available
- Re: [gpsd-users] Missing fixes, Gary E. Miller, 2018/02/19
- Re: [gpsd-users] Missing fixes, Deven Hickingbotham, 2018/02/20
- Re: [gpsd-users] Missing fixes,
Gary E. Miller <=
- Re: [gpsd-users] Missing fixes, Deven Hickingbotham, 2018/02/20
- Re: [gpsd-users] Missing fixes, Gary E. Miller, 2018/02/20
- Re: [gpsd-users] Missing fixes, Deven Hickingbotham, 2018/02/20
- Re: [gpsd-users] Missing fixes, Gary E. Miller, 2018/02/21
- Re: [gpsd-users] Missing fixes, Gary E. Miller, 2018/02/21
- Re: [gpsd-users] Missing fixes, Deven Hickingbotham, 2018/02/21
- Re: [gpsd-users] Missing fixes, Gary E. Miller, 2018/02/21
- Re: [gpsd-users] Missing fixes, Deven Hickingbotham, 2018/02/21
- Re: [gpsd-users] Missing fixes, Gary E. Miller, 2018/02/21
- Re: [gpsd-users] Missing fixes, Deven Hickingbotham, 2018/02/25