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Re: [gpsd-dev] [Thumbgps-devel] PPS over USB
From: |
Gary E. Miller |
Subject: |
Re: [gpsd-dev] [Thumbgps-devel] PPS over USB |
Date: |
Wed, 2 May 2012 13:13:10 -0700 |
Yo tz!
On Wed, 2 May 2012 07:09:09 -0400
tz <address@hidden> wrote:
> SkyTraq has a different version of the 638 (not just different
> firmware) that emits corrections to the pps edge to go to 10nS, and
> after a lock it will work down to 1 satellite and maintain accurate
> pps.
Got a model #?
> I don't know of any others that retain pps if they don't have a 3d
> lock.
The Garmin GPS 18 spec says:
"The accuracy of the one-pulse-per-second output is maintained only
while the GPS receiver is computing a valid position fix. "
I always took taht to mean 2D mode was good enough, but I see how 3D
mode would be more accurate timewise.
Looking for that check in the gpsd code, I do not see it in the PPS path
or in the NMEA path. I wonder when that disappeared? That may explain
some things... I'll go add that back in now.
RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97701
address@hidden Tel:+1(541)382-8588
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- Re: [gpsd-dev] PPS over USB, (continued)
- Re: [gpsd-dev] PPS over USB, Hal Murray, 2012/05/02
- Re: [gpsd-dev] PPS over USB, Jim Thompson, 2012/05/02
- Re: [gpsd-dev] PPS over USB, Gary E. Miller, 2012/05/02
- Re: [gpsd-dev] PPS over USB, Chris Kuethe, 2012/05/02
- Re: [gpsd-dev] PPS over USB, Dave Taht, 2012/05/02
- Re: [gpsd-dev] PPS over USB, HÃ¥kan Johansson, 2012/05/02
- Re: [gpsd-dev] PPS over USB, Gary E. Miller, 2012/05/02
- Re: [gpsd-dev] PPS over USB, Chris Kuethe, 2012/05/02
- Re: [gpsd-dev] PPS over USB, Eric S. Raymond, 2012/05/06
- Re: [gpsd-dev] [Thumbgps-devel] PPS over USB, tz, 2012/05/02
- Re: [gpsd-dev] [Thumbgps-devel] PPS over USB,
Gary E. Miller <=
- Re: [gpsd-dev] [Thumbgps-devel] PPS over USB, tz, 2012/05/02
- Re: [gpsd-dev] [Thumbgps-devel] PPS over USB, Hal Murray, 2012/05/02
- Re: [gpsd-dev] [Thumbgps-devel] PPS over USB, tz, 2012/05/02
Re: [gpsd-dev] PPS over USB, Ed W, 2012/05/04
- Re: [gpsd-dev] PPS over USB, Gary E. Miller, 2012/05/04
- Re: [gpsd-dev] PPS over USB, Hal Murray, 2012/05/04
- Re: [gpsd-dev] PPS over USB, Jim Thompson, 2012/05/04
- Re: [gpsd-dev] PPS over USB, Gary E. Miller, 2012/05/05
- Re: [gpsd-dev] PPS over USB, Eric S. Raymond, 2012/05/06
- Re: [gpsd-dev] PPS over USB, Jim Thompson, 2012/05/06