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Re[2]: NTPsec reports excessive jitter from GPSD/KPPS SHM


From: Nick Burkitt
Subject: Re[2]: NTPsec reports excessive jitter from GPSD/KPPS SHM
Date: Sun, 08 Mar 2020 01:49:00 +0000
User-agent: eM_Client/7.2.37929.0

Hi Gary.

Thanks - does the order matter? I've been using 

gpsd -n /dev/pps0 /dev/ttyACM4

and seeing those large PPS jitter numbers in NTPsec

When I try 

gpsd -n /dev/ttyACM4 /dev/pps0

NTPsec doesn't seem to be able to find SHM(1) at all

     remote           refid      st t when poll reach   delay   offset   jitter
 SHM(0)          .GPS.            0 l    8   64  377   0.0000 -65.3223   1.4824
 SHM(1)          .PPS.            0 l    -    8    0   0.0000   0.0000   0.0019
+gatekeeper.tss. 216.218.254.202  2 u   27   64  377  42.5804   1.7949   0.8879
-ntp1.nbg1.squar 193.171.23.163   2 u   32   64  377 174.9244   6.6212   1.1147
*chl.la          216.218.192.202  2 u   11   64  377  29.7299   2.6507   2.8947
-vf2.bbnx.net    253.109.221.150  2 u   18   64  373 103.4807  -3.8824  21.8616
 pool.ntp.org    .POOL.          16 p    -  256    0   0.0000   0.0000   0.0019
-134.209.141.224 127.67.113.92    2 u   18   64  377  24.9198  -0.2233   0.7348
+paladin.latt.ne 204.123.2.72     2 u   22   64  377  21.7663  -0.2696   1.1303
-pegasus.latt.ne 128.227.205.3    2 u   16   64  163  84.8570  -0.5848   1.3430
 ntp1.ams1.squar 193.79.237.14    2 u   79   64   42 179.8666  13.4722   1.7658
ntpd ntpsec-1.1.8+ 2020-03-04T20:55:58Z        Updated: 2020-03-08T01:46:24 (4)
 lstint avgint rstr r m v  count rport remote address
      0  32083    0 . 6 2   2073 44435 localhost
     12 4431795   d0 . 4 4     16   123 chl.la
     17     98   d0 . 4 4      5   123 pegasus.latt.net
     19 4431795   d0 . 4 4     16   123 vf2.bbnx.net
     19 4154808   d0 . 4 4     17   123 134.209.141.224
     23 4154808   d0 . 4 4     17   123 paladin.latt.net
     28 4154807   d0 . 4 4     17   123 gatekeeper.tss.net
     33 4748351   d0 . 4 4     15   123 ntp1.nbg1.squareflow.xyz
     80    136   d0 . 4 4      3   123 ntp1.ams1.squareflow.xyz


-Nick

------ Original Message ------
From: "Gary E. Miller" <address@hidden>
To: address@hidden
Sent: 3/7/2020 5:01:30 PM
Subject: Re: NTPsec reports excessive jitter from GPSD/KPPS SHM

Yo Nick!
 
On Sun, 08 Mar 2020 00:10:08 +0000
"Nick Burkitt" <address@hidden> wrote:
 
Here's a thought. My environment is an embedded Linux device. The GPS
receiver is connected via USB, and the PPS is connected via a
hardware interrupt line.
 
I have a few similar.
 
Can gpsd make sense of this configuration? Or does the fact that the
GPS and PPS are not explicitly related cause problems?
Thanks,
 
I do it this way: gpsd -nG /dev/ttyACM0 /dev/pps0
 
RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
address@hidden Tel:+1 541 382 8588
 
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