[time-nuts] Distance between GPS Antennae

Azelio Boriani azelio.boriani at screen.it
Sun Dec 18 18:25:50 EST 2011


And I have seen that the NavSync GPSes even if in position hold mode output
a variable position anyway.

On Sun, Dec 18, 2011 at 11:50 PM, k4cle at aol.com <k4cle at aol.com> wrote:

> Some GPS receivers automatically go into "position hold" mode if less than
> 1 mph is detected for several seconds.  However, they usually have a
> command to disable that feature if you search the manual for the command.
>
> Connected by DROID on Verizon Wireless
>
>
> -----Original message-----
> From: Tom Van Baak <tvb at LeapSecond.com>
> To: Discussion of precise time and frequency measurement <
> time-nuts at febo.com>
> Sent: Sun, Dec 18, 2011 22:35:42 GMT+00:00
> Subject: Re: [time-nuts] Distance between GPS Antennae
>
> From: "Brent Gordon" <time-nuts at adobe-labs.com>
>
>>  The best answer is try it it and see what happens.  In my case two
>>  systems with patch antennas ten inches apart interfere significantly.
>>  Here are plots (using VisualGPS) of my position over a day or two.
>>  This is using a GPS from Sure Electronics.  Note that the standard
>>  deviation is 0 for over 100,000 samples.  As a side note, it must have
>>  some kind of heavy filtering going on to not show any position
>>  variation.  This kind of result is repeatable with this unit.
>>
>
> Brent,
>
> That's really interesting. It looks like one receiver is in GPS
> hold mode (so you would expect the position to remain fixed)
> and the other is in a normal 2D or 3D mode. Can you look at
> the NMEA logs and tell which is which? Is this the same GPS
> receiver I played with (leapsecond.com/pages/MG1613S)?
>
> Thanks,
> /tvb
>
>
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