Re: [gpsd-users] Support for PPS on 10Hz Devices

[Andrew Yong]

Hi Gary, gpsd users,

I still can’t get a PPS good from GPSD even though the GPS unit has had a continuous fix for more than a week:

gpsd:RAW: PPS pps-detect on /dev/ttyUSB0 changed to 1

gpsd:INFO: PPS cycle: 1000227, duration:  900204 @ 1381331108.385510

gpsd:RAW: PPS edge accepted 1Hz leading edge

gpsd:RAW: PPS ntpshm_pps: no current GPS seconds: -1381331107816192

gpsd:RAW: PPS edge accepted 0.000000 offset 1381331108.000000000

gpsd:IO: => client(0): {"class":"PPS","device":"/dev/ttyUSB0","real_sec":0, "real_musec":0,"clock_sec":1381331108,"clock_musec":385819}\x0d\x0a

gpsd:PROG: KPPS assert 0.000000000, sequence: 0 - clear  0.000000000, sequence: 0

gpsd:PROG: KPPS data: using clear

gpsd:INFO: KPPS cycle:       0, duration:       0 @ 0.000000000

gpsd:RAW: PPS pps-detect on /dev/ttyUSB0 changed to 0

gpsd:INFO: PPS cycle: 1000200, duration:   99996 @ 1381331108.485506

gpsd:RAW: PPS edge rejected 1Hz trailing edge

GPS module even has ZDA sentences enabled (though I understand it’s not required since gpsd can compute seconds without it).

Output is at 1Hz. PPS pulse is 100ms. Let me know if anyone is kind enough to take a look at my NMEA output :)

Thanks guys.

On Thu, Oct 3, 2013 at 1:09 PM, Andrew Yong <address@hidden> wrote:

Hi Gary,

Hm, I was using gpsd -nnD 10. Seems like cgps fix time count starts whenever I launch cgps.

Andrew

> On 3 Oct, 2013, at 12:55 pm, "Gary E. Miller" <address@hidden> wrote:
>
> Yo Andrew!
>
> On Thu, 3 Oct 2013 12:12:05 +0800
> Andrew Yong <address@hidden> wrote:
>
>> Here’s the CGPS output for your guru meditation:
> [...]
>> │    Status:     3D FIX (19 secs)           ││  28    42    010    28
>
> 19 seconds of 3D is not gonna give you much PPS.  Are you sure you are
> using the '-n' flag?
>
>
> RGDS
> GARY
> ---------------------------------------------------------------------------
> Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97701
>    address@hidden  Tel:+1(541)382-8588