refclock 28 gone wacky on me

Hal Murray hmurray at megapathdsl.net
Fri Jun 10 04:02:57 UTC 2016


> There is a GPGGA listed up high in the Sentences block but I haven't seen one.

Blush.  It was right in front of me.  See below.


gem at rellim.com said:
> gpsd assumes that the fix data for each second starts to arrive just after
> the beginning of the second.  But yours starts so close to the end of the
> second that data will still be spilling into the next second, before
> anything is computed. 

I can confirm that stuff starts just before the PPS.  

Here is an updated version of a 1 second clump:

(78) $GPGGA,035325.788,3726.0641,N,12212.2600,W,6,00,58.8,32.3,M,-32.2,M,,0000
*60
------------------------------------- PPS ------------------------------------
-
(42) $GPGSA,A,2,,,,,,,,,,,,,19.1,58.8,03.6*0A
(70) $GPGSV,3,1,12,20,75,073,20,29,68,105,23,21,54,295,32,04,42,282,29*72
(66) $GPGSV,3,2,12,18,41,212,,26,31,300,13,15,28,126,,05,27,046,10*79
(66) $GPGSV,3,3,12,25,22,189,13,13,21,088,,16,12,323,,31,00,254,22*79
(72) $GPRMC,035325.788,V,3726.0641,N,12212.2600,W,004.5,008.7,100616,,,E*61
(40) $GPVTG,008.7,T,,M,004.5,N,008.3,K,E*0C

------------

Here are a few seconds with time stamps:
57549 14110.989577 $GPGGA,035510.788,3726.0854,N,12212.2601,W,1,03,1.7,37.1,M,
-32.2,M,,0000*5B
57549 14111.041549 $GPGSA,A,2,05,21,25,,,,,,,,,,1.8,1.7,0.7*3A
57549 14111.119555 $GPGSV,3,1,12,20,74,070,02,29,67,107,03,21,55,297,34,18,42,
212,*75
57549 14111.198574 $GPGSV,3,2,12,04,42,281,30,26,31,299,01,15,28,125,,05,26,04
6,22*7F
57549 14111.276568 $GPGSV,3,3,12,13,22,087,19,25,21,189,15,16,13,322,,31,00,25
3,22*7F
57549 14111.359572 $GPRMC,035510.788,A,3726.0854,N,12212.2601,W,000.0,350.7,10
0616,,,A*76
57549 14111.405559 $GPVTG,350.7,T,,M,000.0,N,000.0,K,A*0C

57549 14111.992615 $GPGGA,035511.788,3726.0855,N,12212.2603,W,1,03,1.7,37.2,M,
-32.2,M,,0000*5A
57549 14112.046597 $GPGSA,A,2,05,21,25,,,,,,,,,,1.8,1.7,0.7*3A
57549 14112.124603 $GPGSV,3,1,12,20,74,070,01,29,67,107,03,21,55,297,34,18,42,
212,*76
57549 14112.203627 $GPGSV,3,2,12,04,42,281,30,26,31,299,00,15,28,125,,05,26,04
6,22*7E
57549 14112.280608 $GPGSV,3,3,12,13,22,087,19,25,21,189,16,16,13,322,,31,00,25
3,22*7C
57549 14112.364614 $GPRMC,035511.788,A,3726.0855,N,12212.2603,W,000.0,350.7,10
0616,,,A*74
57549 14112.411610 $GPVTG,350.7,T,,M,000.0,N,000.0,K,A*0C


-- 
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