Re: [time-nuts] NEO-7M various modes

2017-10-29 Thread Thomas Petig 
On Sat, Oct 28, 2017 at 05:27:01PM -0700, jimlux wrote:
> On 10/28/17 3:24 PM, Wayne Holder wrote:
> > uBlox has a utility called u-center
> >  that's a free
> > download.  You can use it to configure the various output options (and
> > enable and disable different messages) and a then save this config back to
> > the module as the start up default.
> >
> Downloaded it, hooked up the modules, found that they won't quite get a fix
> indoors next to the window, but if I take it outside, it will. Oddly, the
> SNR on the SVs is good enough, but there's something preventing the fix from
> happening.
>
> Maybe it's because it's a cold start, it needed to run for a while to
> acquire the almanac or something.
Could be multi-path. Line of sight is blocked and the RX is receiving
reflections, that traveled a bit longer. Thus, solving the navigation
equations fails, or sometimes even worse, gives a wrong position.
Walls, windows and water surfaces provide a multi-path signal with
rather good SNR.

/Thomas, SA6CID

>
>
>
>
>
> > Wayne
> >
> > On Sat, Oct 28, 2017 at 3:12 PM, jimlux  wrote:
> >
> > > I've got 4 NEO-7M-C modules hooked up to 7 beaglebone greens, side by
> > > side, and they're not behaving the same..
> > >
> > > I've got gpsd running, and I'm looking at the output of cgps and/or
> > > gpsmon, as well as ppstest
> > >
> > >
> > > Some emit NMEA sentences, others binary (ublox?) strings?
> > >
> > > Some get a fix and start toggling the 1pps line, others don't.
> > >
> > > Is there some command string one can send to them to put them into a known
> > > state (cold reset?) - the one that's working the best (I.e. has a fix AND
> > > toggles 1pps) seems to be putting out binary strings (when viewed with
> > > gpsmon).
> > >
> > >
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>
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Re: [time-nuts] NEO-7M various modes

2017-10-28 Thread Denny Page 
See the -b and -n options to gpsctl. Also the -b option to gpsd.


> On Oct 28, 2017, at 15:12, jimlux  wrote:
> 
> Some emit NMEA sentences, others binary (ublox?) strings?

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[time-nuts] NEO-7M various modes

2017-10-28 Thread Mark Sims 
Lady Heather will also work with the Ublox modules and can be used to configure 
the units.   Heather can easily be compiled to run under Linux/macOS/freeBSD.

You might have the SNR and/or elevation mask filters set improperly for indoor 
operation.
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Re: [time-nuts] NEO-7M various modes

2017-10-28 Thread jimlux 

On 10/28/17 3:24 PM, Wayne Holder wrote:

uBlox has a utility called u-center
 that's a free
download.  You can use it to configure the various output options (and
enable and disable different messages) and a then save this config back to
the module as the start up default.

Downloaded it, hooked up the modules, found that they won't quite get a 
fix indoors next to the window, but if I take it outside, it will. 
Oddly, the SNR on the SVs is good enough, but there's something 
preventing the fix from happening.


Maybe it's because it's a cold start, it needed to run for a while to 
acquire the almanac or something.







Wayne

On Sat, Oct 28, 2017 at 3:12 PM, jimlux  wrote:


I've got 4 NEO-7M-C modules hooked up to 7 beaglebone greens, side by
side, and they're not behaving the same..

I've got gpsd running, and I'm looking at the output of cgps and/or
gpsmon, as well as ppstest


Some emit NMEA sentences, others binary (ublox?) strings?

Some get a fix and start toggling the 1pps line, others don't.

Is there some command string one can send to them to put them into a known
state (cold reset?) - the one that's working the best (I.e. has a fix AND
toggles 1pps) seems to be putting out binary strings (when viewed with
gpsmon).


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Re: [time-nuts] NEO-7M various modes

2017-10-28 Thread Wayne Holder 
uBlox has a utility called u-center
 that's a free
download.  You can use it to configure the various output options (and
enable and disable different messages) and a then save this config back to
the module as the start up default.

Wayne

On Sat, Oct 28, 2017 at 3:12 PM, jimlux  wrote:

> I've got 4 NEO-7M-C modules hooked up to 7 beaglebone greens, side by
> side, and they're not behaving the same..
>
> I've got gpsd running, and I'm looking at the output of cgps and/or
> gpsmon, as well as ppstest
>
>
> Some emit NMEA sentences, others binary (ublox?) strings?
>
> Some get a fix and start toggling the 1pps line, others don't.
>
> Is there some command string one can send to them to put them into a known
> state (cold reset?) - the one that's working the best (I.e. has a fix AND
> toggles 1pps) seems to be putting out binary strings (when viewed with
> gpsmon).
>
>
> ___
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/m
> ailman/listinfo/time-nuts
> and follow the instructions there.
>
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[time-nuts] NEO-7M various modes

2017-10-28 Thread jimlux 
I've got 4 NEO-7M-C modules hooked up to 7 beaglebone greens, side by 
side, and they're not behaving the same..


I've got gpsd running, and I'm looking at the output of cgps and/or 
gpsmon, as well as ppstest



Some emit NMEA sentences, others binary (ublox?) strings?

Some get a fix and start toggling the 1pps line, others don't.

Is there some command string one can send to them to put them into a 
known state (cold reset?) - the one that's working the best (I.e. has a 
fix AND toggles 1pps) seems to be putting out binary strings (when 
viewed with gpsmon).



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