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Re: [External] Re: Time precision in gps_fix_t

From: Kai Harrekilde-Petersen
Subject: Re: [External] Re: Time precision in gps_fix_t
Date: Wed, 22 Jan 2020 21:35:20 +0100
User-agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1

I have a 50Hz binary dump from my Skytraq GNSS lying around from a couple of years back (~14KB, so 250ish lines), but I have to admit that I don't recall the contents. Once my pi gets through the upgrade to 'buster' I'll see if I can generate a proper 50Hz log for you (I have a UART sniffer on it).

What mode (NMEA vs binary) and how many seconds worth of data would you like?



On 22 Jan 2020 21.28, Gary E. Miller wrote:
Yo Greg!

On Wed, 22 Jan 2020 12:54:12 -0500
Greg Troxel <address@hidden> wrote:

"Gary E. Miller" <address@hidden> writes:

Yo Greg!

On Wed, 22 Jan 2020 12:16:02 -0500
Greg Troxel <address@hidden> wrote:
All true, but Marco asked a perfectly fair question about gpsd
losing the subsecond time-of-fix.
I see no evidence of that.  If that is true it is a serious bug.
I don't have the logs handy, but I was doing captures of the json data
(gpspipe -w) from an M8030 set to 2 Hz.   Adjacent lines had the same
timesstamps, both with 0 subsecond fix times.
Multiple TPV with the same time stamp is not unusual.  Care to share your
raw dumps?

Regardless, getting time to 100 micro seconds from the serial data
is unlikely by at least 2 orders of magnitude.

I'll see if I can generate this, but it should be easy for anyone to
set ublox 8 to 2, 5 or 10 Hz.
So much to so, so little time...

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

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