[time-nuts] What position is measured?

[jmfranke]

Yes, it is the position of the antenna.  Once the signals enter the 
downlead, their relative positions in time are fixed.  It is the relative 
positions in time that are used to determine position.

John  WA4WDL

--------------------------------------------------
From: "Peter Krengel" <krengeldatec at gmx.de>
Sent: Tuesday, September 07, 2010 1:57 AM
To: <time-nuts at febo.com>
Subject: [time-nuts] What position is measured?

> Hi nuts,
>
> have got some interesting question from friends.
> They asked
>
> What coordinates are measured and registrated by a GPS.
> Is it the position of the antenna, it could be 100m (300ft) away from me
> or is it the position of the GPS RX as this is the position of the µC 
> where
> signals are processed?
>
> I answered, its allways the antenna position as there is the point where
> wave fronts coming in from the sats becomes electrical signals (note we 
> are
> not talking about PPS but coordinates)...
>
> What do you think?
>
> Peter, DG4EK
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