[time-nuts] Averaging Location for Position Hold

jmfranke jmfranke at cox.net
Tue Sep 13 22:37:47 UTC 2011

The position is solely defined by the location of the antenna. Once all of 
the satellite signals enter the antenna, the time differences are fixed, 
only the absolute time changes. The GPS receiver computes the position of 
the antenna using time differences. The coax cable length can affect the 
time, unless compensated for the propagation delay.

John  WA4WDL

From: "Rex Moncur" <rmoncur at bigpond.net.au>
Sent: Tuesday, September 13, 2011 6:28 PM
To: "'Discussion of precise time and frequency measurement'" 
<time-nuts at febo.com>
Subject: Re: [time-nuts] Averaging Location for Position Hold

> Hi All
> In my case the Google Earth position cf if the GPS averaged position is
> within 3 metres of the physical position of my GPS RX but about 8 metres
> from the physical position of my GPS antenna.  Can anyone tell me if the
> length of the cable has any affect on the GPS reported position or is the
> position defined solely on the position of the antenna?
> Rex VK7MO
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